Kyocera - Монолитный осевой инструмент 2016 ENG
для заказа - kyocera@kyocera-tools.ru INCH FORMULAS
TAPS ENGINEERING DATA
FORMULA FOR TAP / DRILL SIZES
(INCH)
METHOD 1
DRILLS Drilled Hole Size (in.) = Basic Major Dia. of Thread (in.) - .013 X % of Full Thread*
# of Threads per Inch (T.P.I.)
* Use whole number for % of thread...for 65%, use 65 (not .65).
END MILLS METHOD 2
ROUTERS Nominal O.D. - (Dbl. Thread Depth X % of Full Thread) = Drilled Hole Size
EX AMPLE: To find the hole size for obtaining 75% of thread in a 1/4-20 tapped hole, follow first column
down to 20 threads, then across to 75% of thread. This figure (0.0485), when subtracted from the 0.250
diameter, is 0.2015, which is the required diameter of hole. See equation:
0.2500 - 0.0485 = 0.2015
THREAD MILLS To figure whether or not pitch is too coarse for diameter:
& TAPS (Double thread depth) X 3 = x
x = the smallest diameter possible for that T.P.I.
ENGRAVERS Threads Double 50% 55% 60% 65% 70% 75% 80% 85%
per Inch Thread Thread Thread Thread Thread Thread Thread Thread Thread
BORING BARS Depth
6 0.1083 0.1192 0.1300 0.1408 0.1517 0.1625 0.1733 0.1842
REAMERS 7 0.21651 0.0929 0.1021 0.1114 0.1207 0.1300 0.1393 0.1486 0.1579
8 0.18558 0.0813 0.0894 0.0975 0.1056 0.1138 0.1219 0.1300 0.1381
SAWS 9 0.16238 0.0722 0.0794 0.0866 0.0939 0.1011 0.1083 0.1156 0.1228
10 0.14434 0.0649 0.0714 0.0779 0.0844 0.0909 0.0974 0.1039 0.1105
TECHNICAL 11 0.12990 0.0590 0.0649 0.0708 0.0767 0.0826 0.0885 0.0944 0.1005
12 0.11809 0.0541 0.0595 0.0649 0.0702 0.0755 0.0808 0.0861 0.0921
INDEX 13 0.10825 0.0499 0.0549 0.0599 0.0649 0.0699 0.0749 0.0799 0.0850
14 0.09992 0.0464 0.0510 0.0556 0.0602 0.0648 0.0694 0.0740 0.0789
16 0.09278 0.0406 0.0446 0.0486 0.0526 0.0566 0.0606 0.0646 0.0691
18 0.08119 0.0361 0.0396 0.0431 0.0466 0.0501 0.0536 0.0571 0.0614
20 0.07217 0.0325 0.0357 0.0389 0.0421 0.0453 0.0485 0.0517 0.0553
24 0.06495 0.0270 0.0298 0.0326 0.0354 0.0382 0.0410 0.0438 0.0460
27 0.05412 0.0240 0.0264 0.0288 0.0312 0.0336 0.0360 0.0384 0.0409
28 0.04811 0.0232 0.0254 0.0276 0.0298 0.0324 0.0347 0.0370 0.0395
30 0.04639 0.0216 0.0238 0.0260 0.0282 0.0304 0.0326 0.0348 0.0368
32 0.04330 0.0203 0.0223 0.0243 0.0263 0.0283 0.0303 0.0323 0.0345
36 0.04059 0.0180 0.0198 0.0216 0.0234 0.0252 0.0270 0.0288 0.0307
40 0.03608 0.0162 0.0178 0.0194 0.0210 0.0226 0.0242 0.0258 0.0276
44 0.03247 0.0147 0.0162 0.0177 0.0192 0.0207 0.0222 0.0237 0.0251
48 0.02952 0.0135 0.0148 0.0161 0.0174 0.0187 0.0200 0.0213 0.0230
56 0.02706 0.0116 0.0127 0.0138 0.0149 0.0160 0.0171 0.0182 0.0197
64 0.02319 0.0101 0.0111 0.0121 0.0131 0.0141 0.0151 0.0161 0.0173
72 0.02029 0.0090 0.0099 0.0107 0.0115 0.0123 0.0131 0.0139 0.0153
80 0.01804 0.0081 0.0089 0.0097 0.0105 0.0113 0.0121 0.0129 0.0138
0.01623
Figures in table show amount to subtract from O.D. of screw to obtain specific percentages of thread.
Select nearest size commercial stock drill.
194 kyocera@kyocera-tools.ru
www.kyocera-tools.ru