Machinery's Handbook, 31st Edition
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MEASURING SCREW THREADS Best Wire Diameters and Constants for Three-wire Measurement of Acme and Stub Acme Threads with Large Lead Angles, 1-inch Axial Pitch Lead angle, B , deg. 1-start threads 2-start threads Lead angle, B , deg. 2-start threads 3-start threads w 1 ( C + c ) 1 w 1 ( C + c ) 1 w 1 ( C + c ) 1 w 1 ( C + c ) 1 5.0 0.51450 0.64311 0.51443 0.64290 10.0 0.50864 0.63518 0.50847 0.63463 5.1 0.51442 0.64301 0.51435 0.64279 10.1 0.50849 0.63498 0.50381 0.63442 5.2 0.51435 0.64291 0.51427 0.64268 10.2 0.50834 0.63478 0.50815 0.63420 5.3 0.51427 0.64282 0.51418 0.64256 10.3 0.50818 0.63457 0.50800 0.63399 5.4 0.51419 0.64272 0.51410 0.64245 10.4 0.50802 0.63436 0.50784 0.63378 5.5 0.51411 0.64261 0.51401 0.64233 10.5 0.40786 0.63416 0.50768 0.63356 5.6 0.51403 0.64251 0.51393 0.64221 10.6 0.50771 0.63395 0.50751 0.63333 5.7 0.51395 0.64240 0.51384 0.64209 10.7 0.50755 0.63375 0.50735 0.63311 5.8 0.51386 0.64229 0.51375 0.64196 10.8 0.50739 0.53354 0.50718 0.63288 5.9 0.51377 0.64218 0.51366 0.64184 10.9 0.50723 0.63333 0.50701 0.63265 6.0 0.51368 0.64207 0.51356 0.64171 11.0 0.50707 0.63313 0.50684 0.63242 6.1 0.51359 0.64195 0.51346 0.64157 11.1 0.50691 0.63292 0.50667 0.63219 6.2 0.51350 0.64184 0.51336 0.64144 11.2 0.50674 0.63271 0.50649 0.63195 6.3 0.51340 0.64172 0.41327 0.64131 11.3 0.50658 0.63250 0.50632 0.63172 6.4 0.51330 0.64160 0.51317 0.64117 11.4 0.50641 0.63228 0.50615 0.63149 6.5 0.51320 0.64147 0.51306 0.64103 11.5 0.50623 0.63206 0.50597 0.63126 6.6 0.51310 0.64134 0.51296 0.64089 11.6 0.50606 0.63184 0.50579 0.63102 6.7 0.51300 0.64122 0.51285 0.64075 11.7 0.50589 0.63162 0.50561 0.63078 6.8 0.51290 0.64110 0.51275 0.64061 11.8 0.50571 0.63140 0.50544 0.63055 6.9 0.51280 0.64097 0.51264 0.64046 11.9 0.50553 0.63117 0.50526 0.63031 7.0 0.51270 0.64085 0.51254 0.64032 12.0 0.50535 0.63095 0.50507 0.63006 7.1 0.51259 0.64072 0.51243 0.64017 12.1 0.50517 0.63072 0.50488 0.62981 7.2 0.51249 0.64060 0.51232 0.64002 12.2 0.50500 0.63050 0.50470 0.62956 7.3 0.51238 0.64047 0.51221 0.63987 12.3 0.50482 0.63027 0.50451 0.62931 7.4 0.51227 0.64034 0.51209 0.63972 12.4 0.50464 0.63004 0.50432 0.62906 7.5 0.51217 0.64021 0.51198 0.63957 12.5 0.50445 0.62981 0.50413 0.62881 7.6 0.51206 0.64008 0.51186 0.63941 12.6 0.50427 0.62958 0.50394 0.62856 7.7 0.51196 0.63996 0.51174 0.63925 12.7 0.50408 0.62934 0.50375 0.62830 7.8 0.51186 0.63983 0.51162 0.63909 12.8 0.50389 0.62911 0.50356 0.62805 7.9 0.51175 0.63970 0.51150 0.63892 12.9 0.50371 0.62888 0.50336 0.62779 8.0 0.51164 0.63957 0.51138 0.63876 13.0 0.50352 0.62865
8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9
0.51153 0.63944 0.51125 0.63859 0.51142 0.63930 0.51113 0.63843 0.51130 0.63916 0.51101 0.63827 0.51118 0.63902 0.51088 0.63810 0.51105 0.63887 0.51075 0.63793 0.51093 0.63873 0.51062 0.63775 0.51081 0.63859 0.51049 0.63758 0.51069 0.63845 0.51035 0.63740 0.51057 0.63831 0.51022 0.63722 0.51044 0.63817 0.51008 0.63704 0.51032 0.63802 0.50993 0.63685 0.51019 0.63788 0.50979 0.63667 0.51006 0.63774 0.50965 0.63649 0.50993 0.63759 0.50951 0.63630 0.50981 0.63744 0.50937 0.63612 0.50968 0.63730 0.50922 0.63593 0.50955 0.63715 0.50908 0.63574 0.50941 0.63700 0.50893 0.63555 0.50927 0.63685 0.50879 0.63537 0.50913 0.63670 0.50864 0.63518
13.1 13.2 13.3 13.4 13.5 13.6 13.7 13.8 13.9 14.0 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 14.9 15.0
0.50333 0.62841 0.50313 0.62817 0.50293 0.62792 0.50274 0.62778 0.50254 0.62743 0.50234 0.62718 0.50215 0.62694 0.50195 0.62670 0.50175 0.62645 0.50155 0.62621 0.50135 0.62596 0.50115 0.62571 0.50094 0.62546 0.50073 0.62520 0.50051 0.62494 0.50030 0.62468 0.50009 0.62442 0.49988 0.62417 0.49966 0.62391 0.49945 0.62365
For these 3-start thread values see table on following page.
10.0
All dimensions are in inches. Values given for w 1 and ( C + c ) 1 in table are for 1-inch pitch axial threads. For other pitches, divide table values by number of threads per inch. Courtesy of Van Keuren Co.
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