Metric Screw Threads M Profile Machinery's Handbook, 31st Edition
2027
Note: “Section Lined”portions identify tolerance zone. *Dimension D in Fig. 6 is used in the design of tools, etc. For internal threads it is not normally specified. Generally, major diameter acceptance is based on maximum material condition gaging.
0.5 T d
0.5 es
0.5 es
Basic Profile
0.5 T d 2
d Basic Major Dia.
d Max. Major Dia.
d Min. Major Dia.
H 4
d 2 Min. Pitch Dia.
d 2 Max. Pitch Dia.
see Fig. 4
d 2 Basic Pitch Dia.
Fig. 7. External Thread—Limiting M Profile. Tolerance Position g Note: “Section Lined”portions identify tolerance zone and unshaded portions identify allowance (fundamental deviation.) Table 12. Internal Metric Thread - M Profile Limiting Dimensions, ANSI/ASME B1.13M-2005 (R2015)
Minor Diameter D 1
Pitch Diameter D 2
Major Diameter D
Basic Thread Designation M1.6 × 0.35 M2 × 0.4 M2.5 × 0.45 M3 × 0.5 M3.5 × 0.6 M4 × 0.7 M5 × 0.8 M6 × 1 M8 × 1.25 M8 × 1 M10 × 0.75 M10 × 1 M10 × 1.5 M10 × 1.25 M12 × 1.75 M12 × 1.5 M12 × 1.25 M12 × 1 M14 × 2 M14 × 1.5 M15 × 1 M16 × 2 M16 × 1.5 M17 × 1 M18 × 1.5 M20 × 2.5 M20 × 1.5
Toler. Class
Max. a
Min.
Max.
Min.
Max.
Tol.
Min.
6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H 6H
1.221 1.567 2.013 2.459 2.850 3.242 4.134 4.917 6.647 6.917 9.188 8.917 8.376 8.647 10.106 10.376 10.647 10.917 11.835 12.376 13.917 13.835 14.376 15.917 16.376 17.294 18.376
1.321 1.679 2.138 2.599 3.010 3.422 4.334 5.153 6.912 7.153 9.378 9.153 8.676 8.912 10.441 10.676 10.912 11.153 12.210 12.676 14.153 14.210 14.676 16.153 16.676 17.744 18.676
1.373 1.740 2.208 2.675 3.110 3.545 4.480 5.350 7.188 7.350 9.513 9.350 9.026 9.188 10.863 11.026 11.188 11.350 12.701 13.026 14.350 14.701 15.026 16.350 17.026 18.376 19.026
1.458 1.830 2.303 2.775 3.222 3.663 4.605 5.500 7.348 7.500 9.645 9.500 9.206 9.348 11.063 11.216 11.368 11.510 12.913 13.216 14.510 14.913 15.216 16.510 17.216 18.600 19.216
0.085 0.090 0.095 0.100 0.112 0.118 0.125 0.150 0.160 0.150 0.132 0.150 0.180 0.160 0.200 0.190 0.180 0.160 0.212 0.190 0.160 0.212 0.190 0.160 0.190 0.224 0.190
1.600 2.000 2.500 3.000 3.500 4.000 5.000 6.000 8.000 8.000 10.000 10.000 10.000 10.000 12.000 12.000 12.000 12.000 14.000 14.000 15.000 16.000 16.000 17.000 18.000 20.000 20.000
1.736 2.148 2.660 3.172 3.698 4.219 5.240 6.294 8.340 8.294 10.240 10.294 10.397 10.340 12.452 12.407 12.360 12.304 14.501 14.407 15.304 16.501 16.407 17.304 18.407 20.585 20.407
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