Machinery's Handbook, 31st Edition
2020 Metric Screw Threads M Profile Table 6. American National Standard Allowance (Fundamental Deviation) for Internal and External Metric Threads ISO 965/1 ANSI/ASME B1.13M-2005 (R2015)
Allowance (Fundamental Deviation) a
Internal Thread D 2 , D 1
External Thread d , d 2
H b EI
g c es
G
e
f
h
Pitch P
EI
es … … … … … …
es … … …
es
0.2 0.25
+0.017 +0.018 +0.018 +0.019 +0.019 +0.020 +0.020 +0.021 +0.022 +0.022 +0.024 +0.026 +0.028 +0.032 +0.034 +0.038 +0.042 +0.048 +0.053 +0.060 +0.063 +0.071 +0.075 +0.080 +0.100
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
− 0.017 − 0.018 − 0.018 − 0.019 − 0.019 − 0.020 − 0.020 − 0.021 − 0.022 − 0.022 − 0.024 − 0.026 − 0.028 − 0.032 − 0.034 − 0.038 − 0.042 − 0.048 − 0.053 − 0.060 − 0.063 − 0.071 − 0.075 − 0.080 − 0.100
0.3
0.35
− 0.034 − 0.034 − 0.035 − 0.036 − 0.036 − 0.038 − 0.038 − 0.038 − 0.040 − 0.042 − 0.045 − 0.048 − 0.052 − 0.058 − 0.063 − 0.070 − 0.075 − 0.080 − 0.085 − 0.090 − 0.095 − 0.118
0.4
0.45
0.5 0.6 0.7
− 0.050 − 0.053 − 0.056 − 0.056 − 0.060 − 0.060 − 0.063 − 0.067 − 0.071 − 0.071 − 0.080 − 0.085 − 0.090 − 0.095 − 0.100 − 0.106 − 0.112 − 0.118 − 0.140
0.75
0.8
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6 8
All dimensions are in millimeters. a Allowance is the absolute value of fundamental deviation. b Tabulated in this standard for M internal threads. c Tabulated in this standard for M external threads. Normal LE Short LE
Long LE
6g
5g6g 3g6g 5h6h 3h6h 5H 3H6H
6e6g 4e6g 6g6h 4g6h 6G
4g6g 6h a 4h6h a
6H
4H6H 4G6G a Applies to maximum material functional size (GO thread gage) for plated 6g and 4g6g class threads, respectively. Material Limits for Coated Threads.— Unless otherwise specified, size limits for stan dard external tolerance classes 6g and 4g6g apply prior to coating. The external thread allowance may thus be used to accommodate the coating thickness on coated parts, pro vided that the maximum coating thickness is no more than 1 ∕ 4 of the allowance. Thus, a 6 g thread after coating is subject to acceptance using a basic size 6 h GO thread gage and a 4 g 6 g thread, a 4 h 6 h or 6 h GO thread gage. Minimum material, LO, or NOT-GO gages would be 6g and 4 g 6 g , respectively. Where the external thread has no allowance or the
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