Kyocera - Монолитный осевой инструмент 2016 ENG
для заказа - kyocera@kyocera-tools.ru METRIC FORMULAS
TAPS ENGINEERING DATA
FORMULA FOR TAP / DRILL SIZES
(METRIC)
METHOD 1
Drilled Hole Size (mm) = Basic Major Dia. of Thread (mm) - % of Full Thread* X mm Pitch DRILLS
76.98
* Use whole number for % of thread...for 65%, use 65 (not .65).
METHOD 2 END MILLS
Nominal O.D. - (Dbl. Thread Depth X % of Full Thread) = Drilled Hole Size ROUTERS
EX AMPLE: To find the hole size for obtaining 75% of thread in a (M6) 6mm x 1.00 tapped hole, follow first column
down to 1.00 threads, then across to 75% of thread. This figure (0.9743), when subtracted from 6mm
diameter, is 5.0257, which is the required diameter of hole. See equation:
M6 - (1.2990 X 75) = (6 - 0.9743) = 5.0257mm
To figure whether or not pitch is too coarse for diameter: THREAD MILLS
(Double thread depth) X 3 = x & TAPS
x = the smallest diameter possible for that T.P.I.
NOTE: All numbers are shown in millimeters (mm). To convert metric values to inches, divide by 25.4
mm Double 50% 55% 60% 65% 70% 75% 80% 85% ENGRAVERS
Pitch Thread Thread Thread Thread Thread Thread Thread Thread Thread
Depth BORING BARS
4.00 2.5982 2.8580 3.1178 3.3776 3.6374 3.8972 4.1570 4.4169
3.50 5.19630 2.2733 2.5006 2.7280 2.9553 3.1826 3.4100 3.6373 3.8646 REAMERS
3.00 4.54660 1.9485 2.1433 2.3381 2.5330 2.7278 2.9227 3.1175 3.3124
2.50 3.89690 1.6238 1.7862 1.9486 2.1109 2.2733 2.4357 2.5981 2.7605 SAWS
2.00 3.24760 1.2990 1.4288 1.5587 1.6886 1.8185 1.9484 2.0783 2.2082
1.75 2.59790 1.1367 1.2503 1.3640 1.4776 1.5913 1.7050 1.8186 1.9323 TECHNICAL
1.50 2.27330 0.9744 1.0718 1.1692 1.2667 1.3641 1.4615 1.5590 1.6564
1.25 1.94870 0.8118 0.8930 0.9742 1.0553 1.1365 1.2177 1.2989 1.3801
1.00 1.62360 0.6495 0.7145 0.7794 0.8444 0.9093 0.9743 1.0392 1.1042
0.90 1.29900 0.5844 0.6428 0.7012 0.7597 0.8181 0.8765 0.9350 0.9934
0.80 1.16870 0.5197 0.5717 0.6236 0.6756 0.7276 0.7796 0.8315 0.8835
0.75 1.03940 0.4871 0.5359 0.5846 0.6333 0.6820 0.7307 0.7794 0.8282
0.70 0.97430 0.4547 0.5001 0.5456 0.5910 0.6365 0.6820 0.7274 0.7729
0.60 0.90930 0.3897 0.4286 0.4676 0.5065 0.5455 0.5845 0.6234 0.6624
0.50 0.77930 0.3211 0.3532 0.3853 0.4174 0.4495 0.4816 0.5137 0.5458
0.45 0.64210 0.2924 0.3216 0.3508 0.3801 0.4093 0.4385 0.4678 0.4970
0.40 0.58470 0.2599 0.2858 0.3118 0.3378 0.3638 0.3898 0.4158 0.4417
0.35 0.51970 0.2274 0.2501 0.2728 0.2956 0.3183 0.3410 0.3638 0.3865
0.30 0.45470 0.1948 0.2143 0.2338 0.2532 0.2727 0.2922 0.3117 0.3312
0.25 0.38960 0.1663 0.1785 0.1948 0.2110 0.2272 0.2434 0.2597 0.2759
0.32460
Figures in table show amount to subtract from O.D. of screw to obtain specific percentages of thread. INDEX
Select nearest size commercial stock drill.
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