Machinery's Handbook, 31st Edition
Taps
1007
Table 26a. Tap Thread Limits ANSI/ASME B94.9-2008 (R2018) for Screw Thread Inserts (STI), Ground Thread, Metric Size (Inch)
Tap Pitch Diameter Limits, inch
Tap Major Diameter, inch
Metric Size STI M2.5
Tolerance Class 4H
Tolerance Classes 5H and 6H
Pitch, mm
Min.
Max.
H limit
Min.
Max.
H limit
Min.
Max.
0.45 0.1239 0.1229 0.5 0.1463 0.1453 0.6 0.1714 0.1704 0.7 0.1971 0.1955 0.8 0.2418 0.2403
1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 6 6 4 6 6
0.1105 0.1100 0.1314 0.1309 0.1537 0.1532 0.1764 0.1759 0.2184 0.2179 0.2629 0.2624 0.3022 0.3017 0.3416 0.3411 0.3480 0.3475 0.4203 0.4198 0.4267 0.4262 0.4336 0.4331 0.5059 0.5054 0.5123 0.5118 0.5187 0.5182 0.5911 0.5906 0.6039 0.6034 0.6698 0.6693 0.6826 0.6821 0.7485 0.7480 0.7613 0.7608 0.7741 0.7736 0.8273 0.8268 0.8401 0.8396 0.8529 0.8524 0.9060 0.9055 0.9188 0.9183 0.9316 0.9311 0.9981 0.9971 1.0236 1.0226 1.1162 1.1152 1.1417 1.1407 1.2343 1.2333 1.2726 1.2716 1.3525 1.3515 1.3907 1.3797 1.4706 1.4696 1.4971 1.4961 1.5226 1.5216 1.5887 1.5877 1.6152 1.6142 1.6407 1.6397
2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 6 6 6 6 6 6 6 6 6 8 8 6 8 8
0.1110 0.1105 0.1319 0.1314 0.1542 0.1537 0.1769 0.1764 0.2187 0.2184 0.2634 0.2629 0.3027 0.3022 0.3421 0.3416 0.3485 0.3480 0.4208 0.4203 0.4272 0.4267 0.4341 0.4336 0.5064 0.5059 0.5128 0.5123 0.5192 0.5187 0.5916 0.5911 0.6049 0.6044 0.6703 0.6698 0.6836 0.6831 0.7490 0.7485 0.7623 0.7618 0.7751 0.7748 0.8278 0.8273 0.8411 0.8406 0.8539 0.8534 0.9065 0.9060 0.9198 0.9193 0.9326 0.9321 0.9991 0.9981 1.0246 1.0236 1.1172 1.1162 1.1427 1.1417 1.2353 1.2343 1.2736 1.2726 1.3535 1.3525 1.3917 1.3907 1.4716 1.4706 1.4981 1.4971 1.5236 1.5226 1.5897 1.5887 1.6162 1.6152
M3
M3.5
M4 M5 M6 M7 M8
1 1 1 1 1
0.2922 0.2906 0.3316 0.3300 0.3710 0.3694 0.4497 0.4481 0.4641 0.4616
1.25 0.3853 0.3828
M10
1.25 0.4776 0.4751 1.25 0.5428 0.5403 1.5 0.5564 0.5539 1.75 0.5700 0.5675 1.5 0.6351 0.6326 0.6623 0.6598 1.5 0.7139 0.7114 2 0.7410 0.7385 1.5 0.7926 0.7901 2.5 0.8470 0.8445 1.5 0.8713 0.8688 2 2 0.8198 0.8173 2.5 0.9257 0.9232 1.5 0.9500 0.9475 2 0.8985 0.8960
M12
M14
M16
M18
M20
M22
2
0.9773 0.9748
2.5 1.0044 1.0019
2 3 2 3 2 2 3 2 3 4 2 3 4
M24
1.0559 1.0534 1.1117 1.1078 1.1741 1.1716 1.2298 1.2259 1.2922 1.2897 1.4103 1.4078 1.4931 1.4892 1.5284 1.5259 1.5841 1.5802 1.6384 1.6345 1.6465 1.6440 1.7022 1.6983 1.7565 1.7516
M27
M30
3.5 1.3750 1.3711
M33
M36
M39
1.6417 1.6407 These taps are over the nominal size to the extent that the internal thread they produce will accommodate a helical coil screw insert, which at final assembly will accept a screw thread of the normal size and pitch. STI basic thread dimensions are determined by adding twice the single thread height (2 × 0.64952 P ) to the basic dimensions of the nominal thread size. Formulas for major and pitch diameters are presented in MIL-T-21309E.
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