Общий каталог OSG 2018 - 2019 - страница 675

S. T. I. STI Drill Size SCREW THREAD INSERT Tap Drill Sizes - STI Taps - Inch Tap Threads Per Inch Minor Diameter (in)(After Tapping) Tap Drill Diameter (in) Size UNC UNF Min Max Aluminum Steel, Magnesium,Plastic 2 56 – 0.0899 0.0961 0.0938 0.0960 3 48 – – 0.1036 0.1104560.10290.10860.10650.1040 0.10940.1065 4 40 – – 0.1175 0.1252480.11660.12290.12000.1181 0.12000.1200 5 40 – 0.1305 0.1373 0.1339 0.1360 6 32 – – 0.1448 0.1527400.14350.15030.14700.1470 0.14950.1495 8 32 – – 0.1708 0.1781360.17010.17710.17300.1730 0.17700.1770 10 24 – – 0.1990 0.2000320.19680.20410.20310.2010 0.20550.2031 12 24 – 0.2250 0.2340 0.2280 0.2280 1/4 20 – – 0.2608 0.2704280.25770.26460.26600.2610 0.26600.2638 5/16 18 – – 0.3245 0.3342240.32150.32880.33200.3281 0.33200.3281 3/8 16 – – 0.3885 0.3987240.38400.39100.39700.3906 0.39700.3906 7/16 14 – – 0.4530 0.4639200.44830.45610.45310.4531 0.45310.4531 1/2 13 – – 0.5166 0.5273200.51080.51860.51560.5156 0.51560.5156 9/16 12 – – 0.5806 0.5918180.57450.58260.57810.5781 0.59380.5781 5/8 11 – – 0.6447 0.6564180.63700.64510.65620.6406 0.65620.6406 3/4 10 – – 0.7716160.7635 0.78380.7720 0.78120.7656 0.78120.7656 7/8 9– – 0.8990 0.9119140.89050.89940.9062 0.90620.89060.8906 1" 8– – 1.0271 1.0421121.01811.02811.0312 1.03121.01561.0312 The suggested drill sizes for aluminum listed in the table are within the minor diameter limits for STI tapped holes specified in MS 33537. Alternate drill sizes are suggested in many instances for magnesium, steel and plastics to provide for maximum tap wear life. In the case of magnesium, the larger size is recommended to allow for material close-in. There are suggested drill sizes and any special requirements or specifications will supersede these recommendations. WWW.OSGTOOL.COM Threading Technical 675