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Tap Specifications
USCTI Table 302  Standard Tap Dimensions for Ground Thread
Nominal Diameter Range (inches)
Machine Screw Size Number
Nominal Fractional Diameter (inches)
Nominal Metric Diameter (mm)
Style
Tap Dimensions (inches)
Over
Through
Over-all Length 
A
Thread Length 
B
Square Length 
C
Shank Diameter D
Size of Square
E
.052 .065 0 1/16 M1.6 1 1-5/8 5/16 3/16 .141 .110
.065 .078 1 - M1.8 1 1-11/16 3/8 3/16 .141 .110
.078 .091 2 - M2,M2.2 1 1-3/4 7/16 3/16 .141 .110
.091 .104 3 3/32 M2.5 1 1-13/16 1/2 3/16 .141 .110
.104 .117 4 - - 1 1-7/8 9/16 3/16 .141 .110
.117 .130 5 1/8 M3, M3.15 1 1-15/16 5/8 3/16 .141 .110
.130 .145 6 - M3.5 1 2 11/16 3/16 .141 .110
.145 .171 8 5/32 M4 1 2-1/8 3/4 1/4 .168 .131
.171 .197 10 3/16 M4.5, M5 1 2-3/8 7/8 1/4 .194 .152
.197 .223 12 7/32 - 1 2-3/8 15/16 9/32 .220 .165
.223 .260 14 1/4 M6, M6.3 2 2-1/2 1 5/16 .255 .191
.260 .323 - 5/16 M7, M8 2 2-23/32 1-1/8 3/8 .318 .238
.323 .395 - 3/8 M10 2 2-15/16 1-1/4 7/16 .381 .286
.395 .448 - 7/16 - 3 3-5/32 1-7/16 13/32 .323 .242
.448 .510 - 1/2 M12,M12.5 3 3-3/8 1-21/32 7/16 .367 .275
.510 .573 - 9/16 M14 3 3-19/32 1-21/32 1/2 .429 .322
.573 .635 - 5/8 M16 3 3-13/16 1-13/16 9/16 .480 .360
.635 .709 - 11/16 M18 3 4-1/32 1-13/16 5/8 .542 .406
.709 .760 - 3/4 - 3 4-1/4 2 11/16 .590 .442
Compiled by United States Cutting Tool Institute

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