Miniature Screw Threads Table 6. Unified Miniature Screw Threads— Minimum Root Flats for External Threads Machinery's Handbook, 31st Edition
1996
Thread Height for Min. Flat at Root 0.64 p
Minimum Flat at Root F rs = 0.136 p
No. of Threads Per Inch
Pitch
mm
mm
Inch
mm
Inch
0.080 0.090 0.100 0.125 0.150 0.175 0.200 0.225 0.250 0.300
318 282 254 203 169 145 127 113 102
0.0512 0.0576 0.0640 0.0800 0.0960 0.1120 0.1280 0.1440 0.1600 0.1920
0.00202 0.00227 0.00252 0.00315 0.00378 0.00441 0.00504 0.00567 0.00630 0.00756
0.0109 0.0122 0.0136 0.0170 0.0204 0.0238 0.0272 0.0306 0.0340 0.0408
0.00043 0.00048 0.00054 0.00067 0.00080 0.00094 0.00107 0.00120 0.00134 0.00161
85
Internal Thread (Nut)
1 / 2 tolerance on major dia. of external thread
1 / 2 P D tolerance on internal tolerance 1 / 2 P D tolerance on external tolerance
0.136 p
External Thread (Screw)
Limits of Size Showing Tolerances and Crest Clearances for UNM Threads
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