Standard Tap Dimensions • Ground Thread • Reference USCTI Table 302

nominal diameter range (in)machine screw size number (in) Blank Design 1nom fract diam (iinal ional eter n)nom me diam mm Blaninal tric eter (in) k Design 2blank design numberoverall length Lthread length l Bsquare length l2 lank Design 3shank diameter D1square size A
.052–.0650 (.0600)—M1.6(.0630)11.63.31.19.1410.110
.065–.0781 (.0730)—M1.8(.0709)11.69.38.19.1410.110
.078–.0912 (.0860)—M2 (0787),M2.2 (.0866)11.75.44.19.1410.110
.091–.1043 (.0990)—M2.5(.0984)11.81.50.19.1410.110
.104–.1174 (.1120)———11.88.56.19.1410.110
.117–.1305 (.1250)—M3(.1181)11.94.63.19.1410.110
.130–.1456 (.1380)—M3.5(.1378)12.00.69.19.1410.110
.145–.1718 (.1640)—M4(.1575)12.13.75.25.1680.131
.171–.19710 (.1900)—M4.5 (.1772),M5 (.1969)12.38.88.25.1940.152
.197–.22312 (.2160)———12.38.94.28.2200.165
.223–.260—1/4(.2500)M6(.2362)22.501.00.31.2550.191
.260–.323—5/16(.3125)M7(.2756),M8(.3150)22.721.13.38.3180.238
.323–.395—3/8(.3750)M10(.3937)22.941.25.44.3810.286
.395–.448—7/16(.4375)——33.161.44.41.3230.242
.448–.510—1/2(.5000)M12(.4724)33.381.66.44.3670.275
.510–.573—9/16(.5625)M14(.5512)33.591.66.50.4290.322
.573–.635—5/8(.6250)M16(.6299)33.811.81.56.4800.360
.635–.709—11/16(.6875)M18(.7087)34.031.81.63.5420.406
.709–.760—3/4(.7500)——34.252.00.69.5900.442
.760–.823—13/16(.8125)M20(.7874)34.472.00.69.6520.489
.823–.885—7/8(.8750)M22(.8661)34.692.22.75.6970.523
.885–.948—15/16(.9375)M24(.9449)34.912.22.75.7600.570
.948–1.010—1(1.0000)M25(.9843)35.132.50.81.8000.600
1.010–1.073—1-1/16(1.0625)M27(1.0630)35.132.50.88.8960.672
1.073–1.135—1-1/8(1.1250)——35.442.56.88.8960.672
1.135–1.198—1-3/16(1.1875)M30(1.1811)35.442.561.001.0210.766
1.198–1.260—1-1/4(1.2500)——35.752.561.001.0210.766
1.260–1.323—1-5/16(1.3125)M33(1.2992)35.752.561.061.1080.831
1.323–1.385—1-3/8(1.3750)——36.063.001.061.1080.831
1.358–1.448—1-7/16(1.4375)M36(1.4173)36.063.001.131.2330.925
1.448–1.510—1-1/2(1.5000)——36.383.001.131.2330.925
1.510–1.635—1-5/8(1.6250)M39(1.5354)36.693.191.131.3050.979
1.635–1.760—1-3/4(1.7500)M42(1.6535)37.003.191.251.43001.072
1.760–1.885—1-7/8(1.8750)——37.313.561.251.51901.139
1.885–2.010—2(2.0000)M48(1.8898)37.633.561.381.64401.233
2.010–2.135—2-1/8(2.1250)——38.003.561.381.76901.327
2.135–2.260—2-1/4(2.2500)M56(2.2047)38.253.561.441.89401.420
2.260–2.385—2-3/8(2.3750)——38.504.001.442.01901.514
2.385–2.510—2-1/2(2.5000)——38.754.001.502.10001.575
2.510–2.635—2-5/8(2.6250)M64(2.5197)38.754.001.502.22501.669
2.635–2.760—2-3/4(2.7500)——39.254.001.562.35001.762
2.760–2.885—2-7/8(2.8750)M72(2.8346)39.254.001.562.47501.856
2.885–3.010—3(3.0000)——39.754.561.632.54301.907
3.010–3.135—3-1/8(3.1250)——39.754.561.632.66802.001
3.135–3.260 3.260–3.385— —3-1/4 3-3/8(3.2500) (3.3750)M80 —(3.1496) —3 310.00 10.004.56 4.561.75 1.752.7930 2.88302.095 2.162
3.385–3.510—3-1/2(3.5000)——310.254.942.003.00802.256
3.510–3.635—3-5/8(3.6250)M90(3.5433)310.254.942.003.13302.350
3.635–3.760—3-3/4(3.7500)——310.505.312.133.21702.413
3.760–3.885—3-7/8(3.8750)——310.505.312.133.34202.506
3.885–4.010—4(4.0000)M100(3.9370)310.755.312.253.46702.600