ANSI General Tap Dimensions ANSI General Tap Dimensions (USCTI Table 302) Blank Style 1 Blank Style 2 Blank Style 3 Nominal DiameterRange - InchesOverTo(Incl.)BLSMSAizcNearceNKhwo.D. ESFIDNGrIiaonaNcmmcthi1ioeentnsaealrlNominalMetricDiameterMillimetersStyleOverallLengthATap Dimensions - InchesThreadLengthBSquareLengthCShankDiameterDSize ofSquare 0.052 0.065 0 1/16 – 1 1 5/8 5/16 3/16 0.141 0.110 0.065 0.078 1 – M1.8 1 1 11/16 3/8 3/16 0.141 0.110 0.078 0.091 2 – M2, M2.2 1 1 3/4 7/16 3/16 0.141 0.110 0.091 0.104 3 3/32 M2.5 1 1 13/16 1/2 3/16 0.141 0.110 0.104 0.117 4 – – 1 1 7/8 9/16 3/16 0.141 0.110 0.117 0.130 5 1/8 M3, M3.15 1 1 15/16 5/8 3/16 0.141 0.110 0.130 0.145 6 – M3.5 1 2 11/16 3/16 0.141 0.110 0.145 0.171 8 5/32 M4 1 2 1/8 3/4 1/4 0.168 0.131 0.171 0.197 10 3/16 M4.5, M5 1 2 3/8 7/8 1/4 0.194 0.152 0.197 0.223 12 7/32 – 1 2 3/8 15/16 9/32 0.220 0.165 0.223 0.260 14 1/4 M6, M6.3 2 2 1/2 1 5/16 0.255 0.191 0.260 0.323 – 5/16 M7, M8 2 2 23/32 1 1/8 3/8 0.318 0.238 0.323 0.385 – 3/8 M10 2 2 15/16 1 1/4 7/16 0.381 0.286 0.385 0.448 – 7/16 – 3 3 5/32 1 7/16 13/32 0.323 0.242 0.448 0.510 – 1/2 M12, M12.5 3 3 3/8 1 21/32 7/16 0.367 0.275 0.510 0.573 – 9/16 M14 3 3 19/32 1 21/32 1/2 0.429 0.322 0.573 0.635 – 5/8 M16 3 3 13/16 1 13/16 9/16 0.480 0.360 0.635 0.709 – 11/16 M18 3 4 1/32 1 13/16 5/8 0.542 0.406 0.709 0.760 – 3/4 – 3 4 1/4 2 11/16 0.590 0.442 0.760 0.823 – 13/16 M20 3 4 15/32 2 11/16 0.652 0.489 0.823 0.885 – 7/8 M22 3 4 11/16 2 7/32 3/4 0.697 0.523 0.885 0.948 – 15/16 M24 3 4 29/32 2 7/32 3/4 0.760 0.570 0.948 1.010 – 1 M25 3 5 1/8 2 1/2 13/16 0.800 0.600 1.010 1.073 – 1 1/16 M27 3 5 1/8 2 1/2 7/8 0.896 0.672 1.073 1.135 – 1 1/8 – 3 5 7/16 2 9/16 7/8 0.896 0.672 1.135 1.198 – 1 3/16 M30 3 5 7/16 2 9/16 1 1.021 0.766 1.198 1.260 – 1 1/4 – 3 5 3/4 2 9/16 1 1.021 0.766 1.260 1.323 – 1 5/16 M33 3 5 3/4 2 9/16 1 1/16 1.108 0.831 1.323 1.385 – 1 3/8 – 3 6 1/16 3 1 1/16 1.108 0.831 1.385 1.448 – 1 7/16 M36 3 6 1/16 3 1 1/8 1.233 0.925 1.448 1.510 – 1 1/2 – 3 6 3/8 3 1 1/8 1.233 0.925 1.510 1.635 – 1 5/8 M39 3 6 11/16 3 3/16 1 1/8 1.305 0.979 1.635 1.760 – 1 3/4 M42 3 7 3 3/16 1 1/4 1.430 1.072 1.760 1.885 – 1 7/8 – 3 7 5/16 3 9/16 1 1/4 1.519 1.139 1.885 2.010 – 2 M48 3 7 5/8 3 9/16 1 3/8 1.644 1.233 2.010 2.135 – 2 1/8 – 3 8 3 9/16 1 3/8 1.769 1.327 2.135 2.260 – 2 1/4 M56 3 8 1/4 3 9/16 1 7/16 1.894 1.420 2.260 2.385 – 2 3/8 – 3 8 1/2 4 1 7/16 2.019 1.514 2.385 2.510 – 2 1/2 – 3 8 3/4 4 1 1/2 2.100 1.575 2.510 2.635 – 2 5/8 M64 3 8 3/4 4 1 1/2 2.250 1.669 2.635 2.760 – 2 3/4 – 3 9 1/4 4 1 9/16 2.350 1.762 2.760 2.885 – 2 7/8 M72 3 9 1/4 4 1 9/16 2.475 1.856 2.885 3.010 – 3 – 3 9 3/4 4 9/16 1 5/8 2.543 1.907 3.010 3.135 – 3 1/8 – 3 9 3/4 4 9/16 1 5/8 2.668 2.001 3.135 3.260 – 3 1/4 M80 3 10 4 9/16 1 3/4 2.793 2.095 3.260 3.385 – 3 3/8 – 3 10 4 9/16 1 3/4 2.883 2.162 3.385 3.510 – 3 1/2 – 3 10 1/4 4 15/16 2 3.008 2.256 3.510 3.635 – 3 5/8 M90 3 10 1/4 4 15/16 2 3.133 2.350 3.635 3.760 – 3 3/4 – 3 10 1/2 5 5/16 2 1/8 3.217 2.413 3.760 3.885 – 3 7/8 – 3 10 1/2 5 5/16 2 1/8 3.342 2.506 3.885 4.010 – 4 M100 3 10 3/4 5 5/16 2 1/2 3.467 2.600 Note: Unless otherwise specified, all OSG taps conform to the dimensions listed above in USCTI Table 302. WWW.OSGTOOL.COM Threading Technical 653