Machinery's Handbook, 31st Edition
MEASURING SCREW THREADS 2137 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. 3-start threads 4-start threads Lead angle, B , deg. 3-start threads 4-start threads w 1 ( C + c ) 1 w 1 ( C + c ) 1 w 1 ( C + c ) 1 w 1 ( C + c ) 1 13.0 0.50316 0.62752 0.50297 0.62694 18.0 0.49154 0.61250 0.49109 0.61109 13.1 0.50295 0.62725 0.50277 0.62667 18.1 0.49127 0.61216 0.49082 0.61073 13.2 0.50275 0.62699 0.50256 0.62639 18.2 0.49101 0.61182 0.49054 0.61037 13.3 0.50255 0.62672 0.50235 0.62611 18.3 0.49074 0.61148 0.49027 0.61001 13.4 0.50235 0.62646 0.50215 0.62583 18.4 0.49047 0.61114 0.48999 0.60964 13.5 0.50214 0.62619 0.50194 0.62555 18.5 0.49020 0.61080 0.48971 0.69928 13.6 0.50194 0.62592 0.50173 0.62526 18.6 0.48992 0.61045 0.48943 0.60981 13.7 0.50173 0.62564 0.50152 0.62498 18.7 0.48965 0.61011 0.48915 0.60854 13.8 0.50152 0.62537 0.50131 0.62469 18.8 0.48938 0.60976 0.48887 0.60817 13.9 0.50131 0.62509 0.50109 0.62440 18.9 0.48910 0.60941 0.48859 0.60780 14.0 0.50110 0.62481 0.50087 0.62411 19.0 0.48882 0.60906 0.48830 0.60742 14.1 0.50089 0.62453 0.50065 0.62381 19.1 0.48854 0.60871 0.48800 0.60704 14.2 0.50068 0.62425 0.50043 0.62351 19.2 0.48825 0.60835 0.48771 0.60666 14.3 0.50046 0.62397 0.50021 0.62321 19.3 0.48797 0.60799 0.48742 0.60628 14.4 0.50024 0.62368 0.49999 0.62291 19.4 0.48769 0.60764 0.48713 0.60590 14.5 0.50003 0.62340 0.49977 0.62262 19.5 0.48741 0.60729 0.48684 0.60552 14.6 0.49981 0.62312 0.49955 0.62232 19.6 0.48712 0.60693 0.48655 0.60514 14.7 0.49959 0.62883 0.49932 0.62202 19.7 0.48638 0.60657 0.48625 0.60475 14.8 0.49936 0.62253 0.49910 0.62172 19.8 0.48655 0.60621 0.48596 0.60437 14.9 0.49914 0.62224 0.49887 0.62141 19.9 0.48626 0.60585 0.48566 0.60398 15.0 0.49891 0.62195 0.49864 0.62110 20.0 0.48597 0.60549 0.48536 0.60359 15.1 0.49869 0.62166 0.49842 0.62080 20.1 … … 0.48506 0.60320 15.2 0.49846 0.62137 0.49819 0.62049 20.2 … … 0.48476 0.60281 15.3 0.49824 0.62108 0.49795 0.62017 20.3 … … 0.48445 0.60241 15.4 0.42801 0.62078 0.49771 0.61985 20.4 … … 0.48415 0.60202 15.5 0.49778 0.62048 0.49747 0.61953 20.5 … … 0.48384 0.60162 15.6 0.49754 0.62017 0.49723 0.61921 20.6 … … 0.48354 0.60123 15.7 0.49731 0.61987 0.49699 0.61889 20.7 … … 0.48323 0.60083 15.8 0.49707 0.61956 0.49675 0.61857 20.8 … … 0.48292 0.60042 15.9 0.49683 0.61926 0.49651 0.61825 20.9 … … 0.48261 0.60002 16.0 0.49659 0.61895 0.49627 0.61793 21.0 … … 0.48230 0.59961 16.1 0.49635 0.61864 0.49602 0.61760 21.1 … … 0.48198 0.49920 16.2 0.49611 0.61833 0.49577 0.61727 21.2 … … 0.481166 0.59879 16.3 0.49586 0.61801 0.49552 0.61694 21.3 … … 0.48134 0.59838 16.4 0.49562 0.61770 0.49527 0.61661 21.4 … … 0.48103 0.59797 16.5 0.49537 0.61738 0.49502 0.61628 21.5 … … 0.48701 0.59756 16.6 0.49512 0.61706 0.49476 0.61594 21.6 … … 0.48040 0.59715 16.7 0.49488 0.61675 0.49451 0.61560 21.7 … … 0.48008 0.59674 16.8 0.40463 0.61643 0.49425 0.61526 21.8 … … 0.47975 0.59632 16.9 0.49438 0.61611 0.49400 0.61492 21.9 … … 0.47943 0.59590 17.0 0.49414 0.61580 0.49375 0.61458 22.0 … … 0.47910 0.59548 17.1 0.49389 0.61548 0.49349 0.61424 22.1 … … 0.47878 0.59507 17.2 0.49363 0.61515 0.49322 0.61389 22.2 … … 0.47845 0.59465 17.3 0.49337 0.61482 0.49296 0.61354 22.3 … … 0.47812 0.59422 17.4 0.49311 0.61449 0.49269 0.61319 22.4 … … 0.47778 0.59379 17.5 0.49285 0.61416 0.49243 0.61284 22.5 … … 0.47745 0.59336 17.6 0.49259 0.61383 0.49217 0.61250 22.6 … … 0.47711 0.52993 17.7 0.49233 0.61350 0.49191 0.61215 22.7 … … 0.47677 0.59250 17.8 0.49206 0.61316 0.49164 0.61180 22.8 … … 0.47643 0.59207 17.9 0.49180 0.61283 0.49137 0.61144 22.9 … … 0.47610 0.59164 … … … … … 23.0 … … 0.47577 0.59121 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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