General/Special Purpose Taps
Pipe
|
Pipe
|
 |
Taper
|
|
Straight
|
|
Spiral
|
|
|
Bright
|
|
TiN
Coated
|
|
Surface
Treated/
Nitride
|
|
Bright
|
|
Bright
|
|
 PREFERRED
|
 ACCEPTABLE
|
|
Reg.
|
|
Int. Thread
|
|
In the chart detailed below, recommended cutting speed is given in Surface Feet Per Minute (S.F.M.).
Refer to tapping feed chart for Revolutions Per Minute (RPM).
|
|
PT150 NPT/ANPT
PT152 NPTF
PT154 NPT/ANPT
PT155 NPTF
|
|
PT159
NPT/ANPT
PT158
NPTF
|
|
PT150G
NPT/ANPT
PT152G
NPTF
|
|
PT153 NPT/ANPT
(CAST IRON)
|
|
PT151 NPS
PT160 NPSF
|
|
PT156
NPT/ANPT
PT157
NPTF
|
|
|
Normal Chip Form
|
|
Code
|
|
Extra Short
Short
Middle/Short
Middle
Middle/Long
Long
Extra Long
|
1
2
3
4
5
6
7
|
|
-
Note:
Optimum cutting speeds for taps are influenced by the usual factors which include machinability
and chip formation characteristics of the material being tapped, workpiece geometry and tap
design. Thread pitch, although often overlooked, is a significant factor in choosing the correct
cutting speed for a given application.
In some instances, tabulated tap cutting speeds will have to be adjusted to accommodate the influence
of thread pitch.
|
|
|
|
|
29, 32
|
|
33
|
|
29
|
|
31
|
|
34
|
|
30
|
|
|
|
|
|
|
|
Main
Group
|
Sub-Group
|
Examples
|
Brinell
Hardness
HB
|
Normal
Chip Form
|
|
1. Steel
|
|
|
S.1
|
Magnetic Soft Steel, Leaded Steels
|
Leaded Steels
|
 120
|
7
|
|
 60
|
|
75
|
|
--
|
|
60
|
|
60
|
|
|
S.2
|
Structural Steel, Case
Carburizing Steel
|
ASTM A36 35, 30
|
200
|
5
|
|
45
|
|
60
|
|
--
|
|
45
|
|
50
|
|
|
S.3
|
Plain Carbon Steel
|
1008, 1024, 1060, 1061
|
250
|
6
|
|
30
|
|
40
|
|
--
|
|
30
|
|
35
|
|
|
S.4
|
Alloy Steel
|
1345, 4140, 4340, 8620
|
250
|
6
|
|
30
|
|
40
|
|
--
|
|
30
|
|
35
|
|
|
S.5
|
Alloyed Steel
Quenched and Tempered Steel
|
1330, 4130, 5160
A2, 4140, 8630, M2
|
> 250
350
|
6
|
|
20
|
|
25
|
|
--
|
|
20
|
|
--
|
|
|
S.6
|
Alloy Steel
Hardened and Tempered Steel
|
4150, 8650, 52100
|
> 350
425
|
6
|
|
10
|
|
15
|
|
--
|
|
10
|
|
--
|
|
|
S.7
|
Tool Steels
|
A2, D2, H13, 01
|
250
|
5
|
|
25
|
|
30
|
|
--
|
|
25
|
|
30
|
|
|
2. Stainless Steel
|
|
|
SS.1
|
Free Machining Stainless Steel
|
303, 416, 430F
|
250
|
4
|
|
25
|
|
35
|
|
--
|
|
25
|
|
25
|
|
|
SS.2
|
Austenitic
|
304, 316, 321
|
250
|
6
|
|
15
|
|
20
|
|
--
|
|
15
|
|
20
|
|
|
SS.3
|
Ferritic + Austenitic, Ferritic,
Martensitic
|
416Se, 449F, 446
|
300
|
6
|
|
15
--
|
|
20
--
|
|
--
--
|
|
15
--
|
|
20
--
|
|
|
3. Cast Iron
|
|
|
CL.1
|
Gray Iron Ferritic
|
ASTM A48 class 20, 25
|
150
|
1
|
|
50
|
|
60
|
|
 65
|
|
50
|
|
--
|
|
|
CL.2
|
Gray Iron Pearlitic or Acicular
|
ASTM A48 Class 40, 55, 60
|
> 150
300
|
1
|
|
30
|
|
35
|
|
40
|
|
30
|
|
--
|
|
|
CL.3
|
Malleable Cast Iron
Nodular Graphite
|
ASTM A220 Grade 40010
ASTM A602 Grade M8501
|
> 160
240
|
3
|
|
30
|
|
35
|
|
40
|
|
30
|
|
--
|
|
|
CL.4
|
Malleable Cast Iron
Nodular Graphite
|
ASTM A220 Grade 90001
ASTM A602 Grade M8501
|
> 240
320
|
3
|
|
15
|
|
20
|
|
25
|
|
15
|
|
--
|
|
|
4. Titanium
|
|
|
T.1
|
Titanium, Unalloyed
|
Commercially Pure 99.0
|
200
|
7
|
|
20
|
|
--
|
|
--
|
|
20
|
|
20
|
|
|
T.2
|
Titanium, Alloys Cast
|
ASTM B367 Grades
C-1, C-7A
|
270
|
5
|
|
15
|
|
--
|
|
--
|
|
15
|
|
15
|
|
|
T.3
|
Titanium, Alloys
|
Ti6A14V, Ti6A16V25n
|
> 270
350
|
5
|
|
--
|
|
--
|
|
--
|
|
--
|
|
5
|
|
|
5. Nickel
|
|
|
N.1
|
Nickel, Unalloyed
|
Nickel 200, Nickel 230
|
170
|
7
|
|
20
|
|
25
|
|
--
|
|
20
|
|
20
|
|
|
N.2
|
Nickel, Alloys
|
Nimonic 75, Monel 400
Hastelloy C, Inconel 600
|
270
|
6
|
|
10
|
|
10
|
|
--
|
|
10
|
|
15
|
|
|
N.3
|
Nickel, Alloys
|
Nimonic 80 Inconel 718
Inconel 825
|
>270
400
|
6
|
|
--
|
|
--
|
|
--
|
|
--
|
|
--
|
|
|
6. Copper
|
|
|
C.1
|
Wrought Copper Alloys
|
101, 130, 170, 630, 725
|
100
|
7
|
|
25
|
|
35
|
|
--
|
|
25
|
|
--
|
|
|
C.2
|
Brass, Bronze
|
ASTM B30
|
200
|
3
|
|
80
|
|
100
|
|
--
|
|
80
|
|
--
|
|
|
C.3
|
Brass
|
ASTM B36
|
200
|
6
|
|
60
|
|
75
|
|
--
|
|
60
|
|
--
|
|
|
C.4
|
High Strength Bronze
|
Phosphor Bronze
|
470
|
2
|
|
10
|
|
15
|
|
15
|
|
10
|
|
10
|
|
|
7. Aluminum Magnesium
|
|
|
A.1
|
Al, Mg, Unalloyed
|
EC, 1060, 1100
|
100
|
7
|
|
50
|
|
65
|
|
--
|
|
50
|
|
--
|
|
|
A.2
|
Al, Alloys, Si>5%
|
6061, 7075, 2024
|
150
|
4
|
|
100
|
|
130
|
|
--
|
|
100
|
|
--
|
|
|
A.3
|
Al, Alloys, Si>5%
10%
|
356, 380
|
120
|
3
|
|
75
|
|
100
|
|
--
|
|
75
|
|
--
|
|
|
A.4
|
Al Alloyed, Si>10%,
Whiskers Reinforced
Al-Alloys, Mg Alloys
|
4032, 390, 392.0
|
120
|
2
|
|
20
|
|
40
|
|
--
|
|
20
|
|
--
|
|
|
8. Synthetic
|
|
|
Sy.1
|
Thermoplastics
|
Polystyrene, Nylon PVC
|
|
7
|
|
30
|
|
50
|
|
--
|
|
30
|
|
--
|
|
|
Sy.2
|
Thermosetting plastics
|
Bakelite
|
|
2
|
|
15
|
|
40
|
|
15
|
|
15
|
|
--
|
|
|
Sy.3
|
Reinforced Plastic Materials
|
Kevlar
|
|
1
|
|
--
|
|
--
|
|
--
|
|
--
|
|
--
|
|
|
APPLICATION MATERIAL GROUPS (AMG) CHART - TAPS
