TABLE FOR MEASURING U. S. STANDARD THREADS WITH MICROMETERS AND WIRES H D .1867 .1742 .04 .2419 .2283 .04 .2954 .2803 .04 .04.000625 .2721 .2942 .2955 .04.000771 3304 .3483 .3495 .04.000976 .3876 .4003 .4016 .04.001274 .4433 .4492 .4507 .06.001479 5317 .5634 .5647 12 51 II II IO 13# 16 IO 157 16 I}" 13" 2}" 21" 23" 23" .4561 4362 .06 .5089 .4872 .06 5712 .5497 .06 .6221.5984 .06 .6844 .6609.06 7327 .7066 0.10 7950 .7691 0.10 .8399 .8105 0.10 .9421 9085 0.10 1.0668 1.0335 0.10 1.1614 1.1224 0.10 1.2862 1.2474 0.10 1.3917 1.3494 0.15 1.4935 1.4469 0.15 1.6182 1.5719 0.15 1.7149 1.6632 0.15 1.8393 1.7882 0.15 4 1.9641 1.9132 0.15 2.0540 1.9961 0.15 2.1787 2.1211 0.15 2.4284 2.3711 0.15 32 2.6326 2.5670 0.20 2.8823 2.8170 0.20 3.10413.0337 0.20 3.3211 3.2448 0.20 .06.001735 .5893 .6162 .6177 .06.002065 .6461 .6672 .6681 .06.002065 .7086 .7297 7312 .06.0025 .7643 7784 .7801 .06.0025 .8267 .8409 .8425 0.10.003086 .94081.0066.0083 0.10.003086 1.0033 1.0691 1.0706 0.10.003906 1.0553 1.1105 1.1124 0.10.005102 1.1667 1.2085 1.2107 0.10.005102 1.2917 1.3335 1.3355 0.10.006944 1.3987 1.4224 1.4250 0.10.006944 1.5237 1.5474 1.5497 0.15.008263 1.7122 1.7994 1.8019 0.15.010 1.8234 1.8969 1.8997 0.15.010 1.9484 2.0219 2.0245 0.15.012343 2.0566 2.11322.1163 0.15.012343 2.1816 2.2382 2.2411 0.15.012343 2.3066 2.3632 2.3667 0.15.015625 2.4105 2.4461 2.4495 0.15.015625 2.5355 2.5711 2.5742 0.15.015625 2.7855 2.8211 2.8240 0.20.0203923.0835 3.1670 3.1704 0.20.020392 3.3335 3.41703.4200 0.20.023654 3.56683.63373.6368 0.20.02775 3.7974 3.8448 3.8486 0.20.02775 4.0474 4.0948 4.0983 0.20.03024 4.2864 4.3228 4.3264 4.5244 4.5500 4.5530 4.7614 4.7728 4.7767 4.9970 4.9938 4.9980 21" 4.7346 4.6438 0.20 0.20.0493735.9032 5.9264 5.9307 D Di n d Р a = = = = = = FIG. 12.- Measuring 60-Degree V-Threads outside diameter of thread. root diameter measured in thread groove. distance from center to center of adjacent threads. distance from apex of thread angle at root, to center of wire. D2= diameter of cylinder touched by apexes of thread angles. diameter from top of threads on one side of tap or bolt, to top of wire laid in thread groove on opposite side. x = (D2 + 2 B)2 + + a. TABLE FOR MEASURING 60-DEGREE V-THREADS WITH MICROMETERS AND WIRES 88 20 18 16 14 I 2 I 2 II II 16 IO 13# IO 4 2}" 2 .1653 .1634 0.04 0.04 .000625 .2180 .2163 0.04 0.04.000771 .2685 .2667 0.04 0.04 .0009765 .3158.3138 0.06 0.06 .0001274 3580 3557 0.06 0.06 .001735 .4202 .4182 0.06 0.06 .001735 .4697 .4676 0.06 0.06 .0020657 5319 530 0.06 0.06 .0020657 .5789 .5768 0.10 0.10.0025 .6412 .6393 0.10 0.10.0025 .6847 .6826 0.10 0.10.003086 7470 7450 0.10 0.10.003086 .7859 7835 0.10 0.10.003906 .8803 .8776 0.10 0.10 .005102 1.00501.0026 0.10 0.10 .005102 1.0895 1.0863 0.15 0.15.006944 1.2141 1.2113 0.15 0.15.006944 1.2825 1.2786 0.15 0.15 .010 1.4071 1.4036 0.15 0.15.010 4 1.4941 1.490 0.15 0.15.012343 3 2.1900 2.1930 2.2825 2.3150 2.3178 2.4075 2.440 2.4426 2.5835 2.670 2.6670 2.8335 2.917 2.9196 3.0525 3.105 3.1085 3.3025 3.355 3.3582 3.5335 3.567 3.5705 3.7613 3.7727 3.7765 4.0113 4.0227 4.0263 WATCH SCREW THREADS WATCH Screw threads are of sharp V-form and generally 45-degree angle for screws used in nickel and brass; though 60 degrees for use in steel. The Waltham Watch Company and others use the centimeter as the unit for all measurements with the exception of the pitch, which is based on the inch; the Waltham threads being 110, 120, 140, 160, 170, 180, 200, 220, 240, 254, per inch and the diameters ranging from 0.120 to 0.035 cm. = D1 root diameter measured in thread groove. number of threads per inch of length. n d P r a B = = = = = = depth of thread. distance from center to center of adjacent threads. diameter of wire used. distance from apex of thread angle at root, to center of wire. D2= diameter of cylinder touched by apexes of thread angles. diameter from top of threads on one side of tap or bolt, to top of wire laid in thread groove on opposite side. x = (D2+ 2 B)2 + + a. 5 M 6 20 18 16 14 12 12 II II 6 57 8 11# 16 ΙΟ ΙΟ 57 I}" .1875 .1699 0.04 .04331.000625 .2733 .2965 .2977 .2428 .2235 0.04 .04331.000771 3313 3501 3514 .2965 .2749 0.04 .04331 .000976 .3883 .4015 .4029 .344 .3231 0.04.04331 .001274 4436 .4497 .4512 3953 3666 0.06 .06496 .001735 5232 .5563 .5582 .4576 .4291 0.06 .06496 .001735 .5907 .6190 .6204 .5105 4794 0.06 .06496 .002065 .6372 .6693 .6710 5728 5420 0.06 .06496 .002065 7097 7319 7334 .6239.5899 0.06 .06496 .0025 7649 7798 .7815 .6862 .6524 0.06 .06496 .0025 .8274 8422 .8438 .7348 .6971 0.06 .06496 .003086 .8810 .8870 .8882 6 1.1644 1.1082 0.10.10839 .006944 1.400 1.4250 1.4276 1.5500 1.5523 5 1.3726 1.3048 0.15.16242 .010 1.7023 1.7796 1.7826 1.497 1.4298 0.15.16242 .010 1.8273 1.9046 1.9074 4 1.5942 1.5193 0.15.16242 .012343 1.9345 1.9941 1.9973 3 3 2 3.327 3.2164 0.20.21567.027755 3.799 3.8477 3.8515 3.5768 3.4664 0.20.21567 .027755 4.049 4.0977 4.1012 23.808 3.693 0.20.21567.030241 4.287 4.3243 4.328 24.0582 3.943 0.20.21567.030241 4.537 4.5743 4.578 0.20.21567.033051 4.7746 4.7993 4.8025 0.20.21567.033051 5.0245 5.0493 5.0524 0.20.21567 .0362525.2607 5.2713 5.275 25.01564.890 0.20.21567 .036252 5.5107 5.5213 5.5248 0.20.21567.040 5-7455 5-7413 5.7446 5.9955 5.9913 5.9944 4.2878 4.168 2 4.5376 4.418 24.7658 4.640 |