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Taper Length Drills
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printer friendly version
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Type of Drill
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General Purpose
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General Purpose
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General Purpose
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General Purpose
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Hi Helix
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Heavy Duty
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Coolant Hole
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Coolant Hole
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Cobalt
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Core Drill
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Wide Land Parabolic
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Wide Land Parabolic
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Wide Land Parabolic
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Wide Land Parabolic
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EZ Style Parabolic
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Carbide Tipped
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HOW TO USE THIS CHART:
 Match Your Workpiece Material
 Define Hole Drilling Depth
 Identify Drill Options
 Determine Surface Feet Per Minute (SFM)
 See Catalog Page For Sizes
 Determine Feed Rate (see below)
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STARTING POINT FOR APPLICATIONS
BASED UPON DRILLING DEPTH
 2X Drill Diameter or Less
 4X Drill Diameter or Less
 6X Drill Diameter or Less
 8X Drill Diameter or Less
Note: Contact Precision Twist Drill
Technical Services for applications not listed.
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 Material Group
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BHN
Hardness
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Normal
Chip Form
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Material Type
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 Surface Feet Per Minute
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1. Steel
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1.1
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Magnetic Soft Steel, Leaded Steels
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 120
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Extra Long
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1116, 1118, 1212
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10L18, 12L13, 12L14
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100C
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100C
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100C
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115C
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--
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--
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155C
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155C
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--
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75C
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100C
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100C
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115C
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--
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100C
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--
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1.2
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Structural Steel, Case
Carburizing Steel
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200
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Medium/Long
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30, 55
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70, 100
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60C
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60C
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60C
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60C
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--
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60C
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75C
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75C
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--
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45C
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60C
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60C
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70C
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--
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60C
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--
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1.3
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Plain Carbon Steel Low, Medium Carbon
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250
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Long
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1008, 1010, 1020
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1040, 1055, 1524
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65D
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65D
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65D
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75D
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--
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65D
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100D
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100D
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--
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50D
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65D
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65D
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75D
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--
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65D
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--
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1.4
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Alloyed Steel, Medium Carbon,
Tool Steel, Wrought
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250
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Long
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4140, 4150, 4340
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A2, 01, D2
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60C
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60C
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60C
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70C
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--
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55C
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85C
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85C
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--
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50C
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60C
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60C
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70C
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--
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60C
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--
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1.5
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Alloyed Steel, Hardened and
Tempered Steel, Tool Steel
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 250
350
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Long
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01, L6, D3, A2, 4140
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4150, 4340, 8620, 8630
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45B
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45B
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45B
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55B
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--
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45B
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60B
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60B
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--
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35B
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45B
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45B
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55B
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--
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45B
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--
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1.6
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Alloyed Steel, Hardened and
Tempered Steel, Tool Steel
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350
400
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Long
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01, L6 D3, A2, 4140
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4150, 4340, 8620, 8630
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--
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--
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--
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--
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--
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--
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30A
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30A
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20A
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--
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--
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--
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--
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20A
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--
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--
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2. Stainless Steel
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2.1
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Free Machining Stainless Steel
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250
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Medium
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303, 416
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430F, 440F
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90D
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90D
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90D
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105D
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--
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90D
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120D
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120D
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95D
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65D
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90D
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90D
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150D
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90D
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90D
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--
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2.2
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Austenitic
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250
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Long
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304, 310, 316
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321, Nitronic 50
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50C
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50C
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50C
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60C
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--
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50C
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65C
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65D
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55C
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40C
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50C
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50C
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60C
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55C
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45C
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--
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2.3
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Ferritic + Austenitic, Ferritic,
Martensitic
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300
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Long
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409, 430, 436
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304, 440A, 440C
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50B
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50B
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50B
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55B
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--
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50B
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65B
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65B
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55B
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40B
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50B
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50B
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60B
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55B
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45B
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--
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2.4
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Precipitation Hardened
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300
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Long
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15-5PH
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Custom 450 17-4PH
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--
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--
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--
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--
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--
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--
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50B
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50B
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30B
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--
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--
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--
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--
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30B
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--
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--
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3. Cast Iron
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3.1
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Soft Gray Cast, Ferritic
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150
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Extra Short
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ASTM A48 Class 20, 40
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G3000
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150D
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150D
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150D
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170D
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--
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150D
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180D
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180D
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160D
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110D
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150D
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150D
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170D
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160D
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150D
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300D
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3.2
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Soft Gray Cast, Pearlitic
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> 150
260
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Extra Short
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ASTM A48 Class 40, 60
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G3500, G4000
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80D
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80D
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80D
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90D
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--
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80D
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110D
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110D
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85D
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60D
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80D
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80D
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90D
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85D
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80D
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30D
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3.3
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Nodular Graphite,
Malleable Cast Iron
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> 150
250
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Medium/Short
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ASTM A220 Grade 40010
SAE J158 Grade M4504
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ASTM A602 Grade M4504
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80C
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80C
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80C
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95C
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--
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80C
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135C
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135C
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85C
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60C
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80C
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80C
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95C
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85C
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80C
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225C
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3.4
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Nodular Graphite,
Malleable Cast Iron
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> 250
320
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Medium/Short
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ASTM A220 Grade 80002
ASTM A602 Grade M8501
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ASTM A220 Grade 90001
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--
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--
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--
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60B
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--
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50B
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75B
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75B
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55B
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--
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--
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--
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60B
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60B
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--
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20B
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4. Titanium
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4.1
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Titanium, Unalloyed
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200
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Extra Long
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Commercially Pure 99.0
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90D
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90D
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90D
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--
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--
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--
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110D
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110D
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--
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70D
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90D
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90D
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--
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--
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90D
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--
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4.2
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Titanium Alloy, Cast
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270
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Medium/Short
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ASTM B367
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Grades C-1 - C-7A
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50C
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50C
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50C
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--
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--
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--
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100C
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100C
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--
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35C
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50C
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50C
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--
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--
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50C
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--
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4.3
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Titanium Alloys
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> 270
350
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Medium/Short
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T16AL4V
T16AL6V2SN
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--
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--
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--
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--
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--
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--
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25B
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25B
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20B
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--
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--
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--
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--
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20B
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--
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--
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5. Nickel
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5.1
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Nickel, Unalloyed
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150
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Extra Long
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Nickel 200, Nickel 230
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50C
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50C
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50C
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60C
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--
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50C
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75C
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75C
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--
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50C
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50C
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50C
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60C
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--
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50C
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--
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5.2
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Nickel Alloys
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> 150
240
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Long
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Nimonic 75
Monel 400
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Hastelloy C
Inconel 600
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--
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--
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--
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--
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--
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--
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30A
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30A
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30A
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--
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--
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--
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--
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20A
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--
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--
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5.3
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Nickel Alloys
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>240
400
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Long
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Nimonic 80
Inconel 718
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Inconel 825
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--
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--
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--
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--
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--
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--
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--
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--
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15A
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--
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--
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--
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--
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10A
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--
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--
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Carbide Recommended Above 275 BHN
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--
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6. Copper
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6.1
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Copper Alloys, Wrought
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100Rb
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Extra Long
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101, 130, 170
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630, 725
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90E
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--
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--
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100E
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90E
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--
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--
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125E
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--
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--
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90E
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--
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100E
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--
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90E
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--
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6.2
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Brass, Bronze
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200Rh
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Medium/Short
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ASTM B30
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80D
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--
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--
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90D
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--
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--
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--
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185D
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--
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--
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80D
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--
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90D
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--
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80D
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--
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6.3
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Brass
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200Rh
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Long
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ASTM B367
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75D
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--
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--
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85D
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--
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--
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--
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180D
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--
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--
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75D
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--
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85D
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--
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75D
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--
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6.4
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High Strength Bronze
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470Rf
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Short
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Phosphor Bronze
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--
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--
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--
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90D
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--
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--
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--
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185D
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--
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--
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--
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--
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--
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--
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--
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--
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7. Aluminum
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7.1
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Al, MG, Unalloyed
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100kg
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Extra Long
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EC, 1060
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1100
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--
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--
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--
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--
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350D
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--
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--
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420D
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--
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--
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350D
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--
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400D
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--
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350D
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--
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7.2
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Al Alloys, Si>5%
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150kg
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Medium
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380, 520.0, 520.2
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2024, 6061
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--
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--
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--
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--
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325D
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--
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--
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375D
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--
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--
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325D
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--
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350D
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--
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325D
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--
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7.3
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Al Alloys, Si>5% <10% |
120kg
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Medium
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319, 333
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356
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--
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--
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--
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--
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--
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--
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--
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300D
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--
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--
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--
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--
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--
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--
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--
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--
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7.4
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Al, Alloys, Si>10%,
Wisker Reinforced
Al-Alloys, MG Alloys
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120kg
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Short
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390, 392, 4032
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222.1, A332.0
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--
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--
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--
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--
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275D
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--
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--
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365D
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--
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--
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275D
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--
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315D
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--
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275D
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--
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8. Plastic
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8.1
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Thermoplastics
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120Rr
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Extra Long
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Polyethylene, Acrylic
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35% Glass Filled
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160B
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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--
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8.2
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Thermosetting
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128Rr
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Short
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Phenolic
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(Nylons) 35% Glass
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160B
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--
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--
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--
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--
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--
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--
|
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--
|
|
--
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--
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--
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--
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--
|
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--
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--
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--
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DATA FEED RATES (DFR) CHART
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Taper Length DRILLS
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HOW TO USE THIS CHART:
- Application Example:
- Drilling a 1/2” dia. hole in alloyed steel 4150 270BHN with a QC21 drill.
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- To Find Cutting Feed Rate (IPR)
- Select the appropriate SFM from the Operating Guides above.
- Use the Alpha symbol to find the material code
- Reference the drill diameter
- Select the corresponding IPR
- To calculate RPM: SFM/D x 3.82 (45/.5 x 3.82)
- To calculate IPM: IPR x RPM (.0060 x 344)
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45B
1/2”
.0060
344
2.06
|
Drill Cutting Data Feed Rates Chart
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Material Code
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Drill Diameter/Inches Per Revolution
|
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1/16
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1/8
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3/16
|
1/4
|
5/16
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3/8
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1/2
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5/8
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3/4
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1
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A
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.0005
|
.0010
|
.0010
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.0020
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.0020
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.0030
|
.0045
|
.0050
|
.0060
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.0070
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B
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.0010
|
.0020
|
.0020
|
.0030
|
.0030
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.0040
|
.0060
|
.0060
|
.0070
|
.0080
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C
|
.0015
|
.0030
|
.0030
|
.0040
|
.0060
|
.0060
|
.0080
|
.0090
|
.0100
|
.0110
|
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D
|
.0020
|
.0040
|
.0050
|
.0060
|
.0080
|
.0090
|
.0110
|
.0120
|
.0130
|
.0140
|
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E
|
.0020
|
.0050
|
.0060
|
.0080
|
.0100
|
.0130
|
.0160
|
.0170
|
.0180
|
.0190
|
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F
|
.0030
|
.0060
|
.0080
|
.0100
|
.0130
|
.0160
|
.0200
|
.0210
|
.0220
|
.0230
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G
|
.0035
|
.0070
|
.0100
|
.0130
|
.0170
|
.0210
|
.0250
|
.0270
|
.0280
|
.0300
|
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H
|
.0050
|
.0100
|
.0150
|
.0230
|
.0310
|
.0390
|
.0440
|
.0470
|
.0470
|
.0470
|
|
Note: Remember these values are
only a starting point. They may require
adjustment based upon conditions or
individual requirements.
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Drilling Terminology/Operating Formulas
The following terms and formulas can be used to determine
the appropriate operating parameters.
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Terms
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Formulas
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IPM
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=
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Inches Per Minute
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IPR x RPM
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=
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IPM
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IPR
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=
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Inches Per Revolution
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IPM/RPM
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=
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IPR
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RPM
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=
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Revolutions Per Minute
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SFM x 3.82/D
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=
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RPM
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SFM
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=
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Surface Feet Per Minute
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D x RPM x .26
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=
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SFM
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D
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=
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Drill Diameter
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APPLICATION MATERIAL GROUPS (AMG) CHART
