Technical InformationDrill Tolerances Diameter Tolerances Diameter RangePlus (+)Minus (–) through 1/8 .0000 .0005 over 1/8 through 1/4 .0000.0007 over 1/4 through 1/2 .0000 .0010 over 1/2 through 1 .0000 .0012 over 1 through 2.0000 .0015 over 2 through 3-1/2.0000.0020 Point Angle Tolerances Diameter Range Included Angle Tolerance 1/16 through 1/2118° / 135°± 5° over 1/2 through 1-1/2118°± 3° over 1-1/2 through 3-1/2118° ± 2° Overall Length and Flute Length Tolerances Diameter RangePlus (+)Minus (–) #80 through 1/8 .1250.0625 over 1/8 through 1/2.1250.1250 over 1/2 through 1 .2500.1250 over 1 through 2 .2500.2500 over 2 through 3-1/2.3750 .3750 Lip Height Tolerances Diameter Range Total Indicator Variation 1/16 through 1/8.0020 over 1/8 through 1/4 .0030 over 1/4 through 1/2.0040 over 1/2 through 1 .0050 over 1 through 3-1/2.0060 Tap Drill Sizes Metric SizesMachine Screw and Fractional Sizes nominal drill decimal tap size size equivalent nominal drill decimal tap size size equivalent nominal drill decimal tap size size equivalent nominal drill decimal tap size size equivalent M1.6 x 0.351.25.0492 M1.8 x 0.351.45.0571 M2 x 0.41.6.0630 M2.2 x 0.451.75.0689 M2.5 x 0.452.05.0807 M3 x 0.52.5.0984 M3.5 x 0.62.9.1142 M4 x 0.73.3.1299 M4.5 x 0.753.7.1457 M5 x 0.84.2.1654 M6 x 1.05.0.1969 M7 x 1.06.0.2362 M8 x 1.256.7.2638 M8 x 1.07.0.2756 M10 x 1.58.5.3346 M10 x 1.258.7.3425 M12 x 1.7510.2.4016 M12 x 1.2510.8.4252 M14 x 2.012.0.4724 M16 x 2.014.0.5512 M16 x 1.514.5.5709 M18 x 2.515.5.6102 M18 x 1.516.5.6496 M20 x 2.517.5.6890 M20 x 1.518.5.7283 M22 x 2.519.5.7677 M22 x 1.520.5.8071 M24 x 3.021.0.8268 M24 x 2.022.0.8661 M27 x 3.024.0.9449 M27 x 2.025.0.9843 M30 x 3.526.51.0433 M30 x 2.028.01.1024 M33 x 3.529.51.1614 M33 x 2.031.01.2205 M36 x 4.032.01.2598 M36 x 3.033.01.2992 0-803/64.0469 1-6453.0595 1-7253.0595 2-5650.0700 2-6450.0700 3-4847.0785 3-5646.081 0 4-4043.0890 4-4842.0935 5-4038.1015 5-4437.1040 6-3236.1065 6-4033.1130 8-3229.1360 8-3629.1360 10-2426.1470 10-3221.1590 12-2416.1770 12-2815.1800 1/4-207.2010 1/4-283.2130 5/16-18F.2570 5/16-24I.2720 3/8-165/16.3125 3/8-24Q.3320 7/16-14U.3680 7/16-2025/64.3906 1/2-1327/64.4219 1/2-2029/64.4531 9/16-1231/64.4844 9/16-1833/64.5156 5/8-1117/32.5312 5/8-1837/64.5781 3/4-1021/32.6562 3/4-1611/16.6875 7/8-949/64.7656 7/8-1413/16.8125 1-87/8.8750 1-1259/64.9219 Pipe Sizes nominal NPT, NPTF tap size w/o reamer w/reamer NPSM NPSC NPSF 1/16-27C (.242)A (.234)—1/4D (.246) 1/8-27Q (.332)21/64T (.358)11/32R (.339) 1/4-187/1627/6415/327/167/16 3/8-189/169/16(.603 special)37/6437/64 1/2-1445/6411/1619mm23/3245/64 3/4-1429/3257/6461/6459/6459/64 1-11½1-9/641-1/81-13/641-5/321-5/32 1¼-11½1-31/641-15/321-35/641-1/2— 1½-11½1-23/321-45/641-25/321-3/4— 2-11½2-3/162-11/642-1/42-7/32—
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