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Table 331 - Special Taps
	A	B		C	D
Threads Per Inch			To 5/8” Incl.	Over 5/8" to 2 1/2” Incl.	Over 2 1/2”	To 1” Incl.	Over 1” to 1 1/2” Incl.	Over 1 1/2” to 2 1/2” Incl.	Over 2 1/2 (Inches)
80 56 48 44 40	.0015 .0015 .0020 .0020 .0025	.0010 .0010 .0010 .0010 .0010	.0005 .0005 .0005 .0005 .0005	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0015	.0005 .0005 .0005 .0005 .0005	.0010 .0010 .0010 .0010 .0010	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0015
36 32 28 24 20	.0025 .0030 .0035 .0040 .0050	.0010 .0010 .0010 .0010 .0010	.0005 .0010 .0010 .0010 .0010	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0015	.0005 .0005 .0005 .0005 .0005	.0010 .0010 .0010 .0010 .0010	.0010 .0010 .0010 .0015 .0015	.0015 .0015 .0015 .0015 .0015
18 16 14 13 12	.0055 .0060 .0070 .0075 .0075	.0010 .0010 .0010 .0010 .0010	.0010 .0010 .0010 .0010 .0010	.0010 .0010 .0015 .0015 .0015	.0015 .0015 .0015 .0015 .0015	.0005 .0005 .0005 .0005 .0005	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0015	.0015 .0020 .0020 .0020 .0020
11 10 9 8 7	.0080 .0090 .0100 .0110 .0120	.0010 .0015 .0015 .0015 .0020	.0010 – – – –	.0015 .0015 .0015 .0015 .0015	.0020 .0020 .0020 .0020 .0020	.0005 .0005 .0005 .0005 .0010	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0020	.0020 .0020 .0020 .0020 .0025
6 5 5 1/2 4 4 1/2	.0140 .0160 .0160 .0190 .0170	.0020 .0025 .0025 .0025 .0025	– – – – –	.0015 .0015 .0015 .0015 .0015	.0020 .0020 .0020 .0020 .0020	.0010 .0010 .0010 .0010 .0010	.0010 .0015 .0015 .0015 .0015	.0020 .0020 .0020 .0020 .0020	.0025 .0025 .0025 .0025 .0025

Table 341 - Metric ISO
P Pitch		W	X	Y				Z
mm	Dec. Equiv.	(Inches)	(Inches)	M1.6 to M6.3 Incl. (Inches)	Over M6.3 to M25 Incl. (Inches)	Over M25 to M90 Incl. (Inches)	Over M90 (Inches)	M1.6 to M6.3 Incl. (Inches)	Over M6.3 to M25 Incl. (Inches)	Over M25 to M90 Incl. (Inches)	Over M90 (Inches)
0.3 0.35 0.4 0.45 0.5	.01181 .01378 .01575 .01772 .01968	.0009 .0011 .0013 .0014 .0016	.0010 .0010 .0010 .0010 .0010	.0015 .0015 .0015 .0015 .0015	.0015 .0015 .0020 .0020 .0020	.0020 .0020 .0020 .0020 .0020	.0020 .0020 .0020 .0020 .0025	.0006 .0006 .0006 .0006 .0006	.0006 .0006 .0006 .0008 .0008	.0008 .0008 .0008 .0008 .0010	.0008 .0008 .0010 .0010 .0010
0.6 0.7 0.75 0.8 0.9	.02362 .02756 .02953 .03150 .03543	.0019 .0022 .0024 .0025 .0028	.0010 .0016 .0016 .0016 .0016	.0020 .0020 .0020 .0020 .0020	.0020 .0020 .0025 .0025 .0025	.0025 .0025 .0025 .0025 .0025	.0025 .0025 .0030 .0030 .0030	.0008 .0008 .0008 .0008 .0008	.0008 .0008 .0010 .0010 .0010	.0010 .0010 .0010 .0010 .0010	.0010 .0010 .0012 .0012 .0012
1 1.25 1.5 1.75 2	.03937 .04921 .05906 .06890 .07874	.0032 .0039 .0047 .0055 .0063	.0016 .0025 .0025 .0025 .0025	.0025 .0025 .0025 – –	.0025 .0025 .0030 .0030 .0035	.0030 .0030 .0030 .0035 .0035	.0030 .0035 .0035 .0040 .0040	.0010 .0010 .0010 – –	.0010 .0012 .0012 .0012 .0016	.0012 .0012 .0012 .0016 .0016	.0012 .0016 .0016 .0016 .0016
2.5 3 3.5 4 4.5	.09843 .11811 .13780 .15748 .17717	.0079 .0095 .0110 .0126 .0142	.0025 .0039 .0039 .0039 .0039	– – – – –	.0035 .0040 .0040 .0040 –	.0040 .0040 .0045 .0045 .0050	.0045 .0050 .0050 .0055 .0055	– – – – –	.0016 .0016 .0016 .0020 .0020	.0016 .0020 .0020 .0020 .0020	.0020 .0020 .0020 .0025 .0025
5 5.5 6	.19685 .21654 .23622	.0158 .0173 .0189	.0039 .0039 .0039	– – –	– – –	.0050 .0055 .0055	.0060 .0060 .0060	– – –	– – –	.0025 .0025 .0025	.0025 .0025 .0025