Общий каталог OSG 2018 - 2019 - страница 674

Tap Drill Size Tap Drill Sizes - Metric Form Taps To minimize tapping problems and lengthen tool life, use Suggested Percentage of Full Thread in Tapped Holes the largest drill possible to produce a minor diameter thatwill result in the lowest percentage of full thread consistentwith adequate strength. A minor diameter that provides aMaterial*Deep HoleAverageThin Sheet StockTappingCommercial Workor Stamping 55% to 65% thread is sufficient for most requirements, but insome cases a higher percentage of thread may be necessaryAluminum, Brass,FreeBronze, Cast Iron,CuttingCopper, Mild Steel,60% - 70%65% - 70%75% - 85% to conform with the minor diameter limits of the thread class Tool Steel specified.* Generally, deeper than 1-1/2 times the hole diameter. Hard orToughCuttingCast Steel, DropForging, Monel Metal,Nickel Steel, StainlessSteel55% - 65%60% - 70% Pitch Minor Diameter(mm) Tap Drill Diameter - Form Taps Tap Size 75% Thread 70% Thread 65% Thread 60% Thread 55% Thread M MF Min. 6H Max. 6H (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) M1.6 0.35 – 1.221 1.321 1.42 0.0559 1.43 0.0563 1.45 0.0571 1.46 0.0575 1.47 0.0579 M1.7 0.35 – 1.321 1.421 1.56 0.0617 1.57 0.0620 1.58 0.0623 1.59 0.0627 1.60 0.0630 M1.8 0.35 – 1.422 1.519 1.62 0.0638 1.63 0.0642 1.65 0.0650 1.66 0.0654 1.67 0.0657 M2 0.4 – 1.567 1.679 1.80 0.0709 1.81 0.0713 1.82 0.0717 1.84 0.0724 1.85 0.0728 M2.2 0.45 – 1.715 1.836 1.97 0.0776 1.99 0.0783 2.00 0.0787 2.02 0.0795 2.03 0.0799 M2.5 0.45 – 2.013 2.138 2.27 0.0894 2.29 0.0902 2.30 0.0906 2.32 0.0913 2.33 0.0917 M2.6 0.45 – 2.113 2.238 2.41 0.0949 2.42 0.0953 2.43 0.0957 2.44 0.0962 2.45 0.0966 M3 0.5 – 2.459 2.599 2.75 0.1083 2.76 0.1087 2.78 0.1094 2.80 0.1102 2.81 0.1106–0.352.6212.7212.860.11262.870.11302.880.11342.890.11382.900.1142 M3.5 0.6 – 2.850 3.010 3.19 0.1256 3.21 0.1264 3.23 0.1272 3.26 0.1283 3.28 0.1291 M4 0.7– – 3.242 3.422 3.64 0.1433 3.67 0.1445 3.69 0.1453 3.71 0.1461 3.74 0.14720.53.4593.5993.750.14763.760.14803.780.14883.800.14963.810.1500 M4.5 0.75 – 3.688 3.876 4.12 0.1622 4.14 0.1630 4.17 0.1642 4.19 0.1650 4.22 0.1661 M5 0.8– – 4.134 4.334 4.59 0.1807 4.62 0.1819 4.65 0.1831 4.67 0.1839 4.70 0.18500.54.4584.6004.750.18704.760.18744.780.18824.800.18904.810.1894 M6 1 – 4.917 5.153 5.49 0.2161 5.52 0.2173 5.56 0.2189 5.59 0.2201 5.63 0.2217–0.755.1875.3775.620.22135.640.22205.670.22325.690.22405.720.2252 M7 1 – 5.918 6.152 6.49 0.2555 6.52 0.2567 6.56 0.2583 6.59 0.2594 6.63 0.2610 1.25 – 6.647 6.912 7.36 0.2898 7.41 0.2917 7.45 0.2933 7.49 0.2949 7.53 0.2965 M8 – 1 6.917 7.153 7.49 0.2949 7.52 0.2961 7.56 0.2976 7.59 0.2988 7.63 0.3004 – 0.75 7.187 7.377 7.62 0.3000 7.64 0.3008 7.67 0.3020 7.69 0.3028 7.72 0.3039 1.5 – 8.376 8.676 9.24 0.3638 9.29 0.3657 9.34 0.3677 9.39 0.3697 9.44 0.3717 M10 –– 1.25 8.647 8.912 9.36 0.3685 9.41 0.3705 9.45 0.3720 9.49 0.3736 9.53 0.375218.9179.1539.490.37369.520.37489.560.37649.590.37769.630.3791 – 0.75 9.188 9.378 9.62 0.3787 9.64 0.3795 9.67 0.3807 9.69 0.3815 9.72 0.3827 1.75 – 10.106 10.441 11.11 0.4374 11.17 0.4398 11.23 0.4421 11.29 0.4445 11.35 0.4469 M12 –– 1.5 10.376 10.676 11.24 0.4425 11.29 0.4484 11.34 0.4465 11.39 0.4484 11.44 0.45041.2510.64710.91211.360.447211.410.449211.450.450811.490.452411.530.4539 – 1 10.917 11.153 11.49 0.4524 11.52 0.4535 11.56 0.4551 11.59 0.4563 11.63 0.4579 M14 2– – 11.835 12.210 12.98 0.5110 13.05 0.5138 13.12 0.5165 13.18 0.5189 13.25 0.52171.512.37612.67613.240.521313.290.523213.340.525213.390.527213.440.5291 M16 2– – 13.835 14.210 14.98 0.5898 15.05 0.5925 15.12 0.5953 15.18 0.5976 15.25 0.60041.514.37614.67615.240.600015.290.602015.340.603915.390.605915.440.6079 M18 2.5– – 15.296 15.743 16.73 0.6587 16.81 0.6618 16.90 0.6654 16.98 0.6685 17.07 0.67201.516.37616.67617.240.678717.290.680717.340.682717.390.684617.440.6866 2.5 – 17.294 17.744 18.73 0.7374 18.81 0.7406 18.90 0.7441 18.98 0.7472 19.07 0.7508 M20 – 1.5 18.376 18.676 19.24 0.7575 19.29 0.7594 19.34 0.7614 19.39 0.7634 19.44 0.7654 – 1 18.917 19.153 19.49 0.7673 19.52 0.7685 19.56 0.7701 19.59 0.7713 19.63 0.7728 2.5 – 19.294 19.744 20.73 0.8161 20.81 0.8193 20.90 0.8228 20.98 0.8260 21.07 0.8295 M22 – 2 19.835 20.210 20.98 0.8260 21.05 0.8287 21.12 0.8315 21.18 0.8339 21.25 0.8366 – 1.5 20.376 20.676 21.24 0.8362 21.29 0.8382 21.34 0.8402 21.39 0.8421 21.44 0.8441 3 – 20.752 21.252 22.47 0.8846 22.57 0.8886 22.67 0.8925 22.78 0.8969 22.88 0.9008 M24 – 2 21.835 22.210 22.98 0.9047 23.05 0.9075 23.12 0.9102 23.18 0.9126 23.25 0.9154 – 1.5 22.376 22.676 23.24 0.9150 23.29 0.9169 23.34 0.9189 23.39 0.9209 23.44 0.9228 FORMULA: TAP DRILL SIZE FORMULA: PERCENTAGE OF FULL THREAD Drill Size = Tap Major Dia - Pitch x % of Full Thread147.059 % of Full Thread = (Tap Major Dia. - Drill Dia.) x 147.059Pitch Example: Determine Drill Size for M12 x 1.75 Tap, 70% Full Thread. Example: Determine the % of Full Thread for M12 x 1.75 Tap, using 11.17mm Drill. Basic Major Diameter of Tap = 12mm Pitch = 1.75 1.75 x 70 = 119 ÷ 147.059 = 0.083mm 12 - 11.17 = 0.83mm x 147.059 ÷ 1.75 = 70 Drill Size = 11.17mm Percentage of Full Thread = 70% 674 Threading Technical WWW.OSGTOOL.COM