ANSI General Tap Dimensions
ANSI General Tap Dimensions (USCTI Table 302)
Blank Style 1
Blank Style 2
Blank Style 3
Nominal Diameter Range (Inch)
Tap Dimensions (Inch)
Nominal Fractional Diameter Inches
Nominal Metric Diameter Millimeters
Mach. Screw Size No.
Style
Overall Length A
Thread Length B
Square Length C
Shank Diameter D
To (Incl.)
Size of Square
BLANK DESIGN 1
Over
0.052 0.065 0.078 0.091 0.104 0.117 0.130 0.145 0.171 0.197 0.223 0.260 0.323 0.385 0.448 0.510 0.573 0.635 0.709 0.760 0.823 0.885 0.948 1.010 1.073 1.135 1.198 1.260 1.323 1.385 1.448 1.510 1.635 1.760 1.885 2.010 2.135 2.260 2.385 2.510 2.635 2.760 2.885 3.010 3.135 3.260 3.385 3.510 3.635 3.760 3.885
0.065 0.078 0.091 0.104 0.117 0.130 0.145 0.171 0.197 0.223 0.260 0.323 0.385 0.448 0.510 0.573 0.635 0.709 0.760 0.823 0.885 0.948 1.010 1.073 1.135 1.198 1.260 1.323 1.385 1.448 1.510 1.635 1.760 1.885 2.010 2.135 2.260 2.385 2.510 2.635 2.760 2.885 3.010 3.135 3.260 3.385 3.510 3.635 3.760 3.885 4.010
0 1 2 3 4 5 6 8
1/16
–
1 1 1 1 1 1 1 1 1 1 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
1 5/8
5/16
3/16 3/16 3/16 3/16 3/16 3/16 3/16
0.141 0.141 0.141 0.141 0.141 0.141 0.141 0.168 0.194 0.220 0.255 0.318 0.381 0.323 0.367 0.429 0.480 0.542 0.590 0.652 0.697 0.760 0.800 0.896 0.896 1.021 1.021 1.108 1.108 1.233 1.233 1.305 1.430 1.519 1.644 1.769 1.894 2.019 2.100 2.250 2.350 2.475 2.543 2.668 2.793 2.883 3.008 3.133 3.217 3.342 3.467
0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.131 0.152 0.165 0.191 0.238 0.286 0.242 0.275 0.322 0.360 0.406 0.442 0.489 0.523 0.570 0.600 0.672 0.672 0.766 0.766 0.831 0.831 0.925 0.925 0.979 1.072 1.139 1.233 1.327 1.420 1.514 1.575 1.669 1.762 1.856 1.907 2.001 2.095 2.162 2.256 2.350 2.413 2.506 2.600
– –
M1.8
1 11/16
3/8
M2, M2.2
1 3/4
7/16
3/32
M2.5
1 13/16
1/2
–
–
1 7/8
9/16
1/8
M3, M3.15
1 15/16
5/8
–
M3.5
2
11/16
5/32 3/16 7/32
M4
2 1/8 2 3/8 2 3/8 2 1/2
3/4 7/8
1/4 1/4
10 12 14
M4.5, M5
–
15/16
9/32 5/16
1/4
M6, M6.3
1
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
5/16
M7, M8
2 23/32 2 15/16 3 5/32 3 19/32 3 13/16 4 1/32 3 3/8 4 15/32 4 11/16 4 29/32 4 1/4 5 7/16 5 7/16 5 3/4 5 3/4 6 1/16 6 1/16 6 3/8 6 11/16 5 1/8 5 1/8
1 1/8 1 1/4
3/8
3/8
M10
7/16
7/16
–
1 7/16 1 21/32 1 21/32 1 13/16 1 13/16 2 7/32 2 7/32 2 1/2 2 1/2 2 9/16 2 9/16 2 9/16 2 9/16 2 2
13/32
1/2
M12, M12.5
7/16
9/16
M14 M16 M18 M20 M22 M24 M25 – M27
1/2
5/8
9/16
11/16
5/8
3/4
11/16 11/16
13/16
7/8
3/4 3/4 7/8 7/8
15/16
1
13/16
1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 7/16 1 1/2
–
M30
1 1
–
M33
1 1/16 1 1/16 1 1/8 1 1/8
–
3 3 3
M36
–
1 5/8 1 3/4 1 7/8 2 1/8 2 1/4 2 3/8 2 1/2 2 2 5/8 2 3/4 2 7/8 3 1/8 3 1/4 3 3/8 3 1/2 3 3 5/8 3 3/4 3 7/8
M39 M42
3 3/16 3 3/16 3 9/16 3 9/16 3 9/16 3 9/16
1 1/8 1 1/4 1 1/4 1 3/8
7
–
7 5/16 7 5/8
M48
–
8
1 3/8 1 7/16 1 7/16 1 1/2 1 1/2 1 9/16 1 9/16 1 5/8
M56
8 1/4 8 1/2 8 3/4 8 3/4 9 1/4 9 1/4 9 3/4 9 3/4
– –
4 4 4 4 4
M64
–
M72
– – – – – –
4 9/16 4 9/16 4 9/16 4 9/16 4 15/16 4 15/16 5 5/16 5 5/16 5 5/16
1 5/8 1 3/4 1 3/4
M80
10 10
10 1/4 10 1/4 10 1/2 10 1/2 10 3/4
2 2
M90
2 1/8 2 1/8 2 1/2
4
M100
Note: Unless otherwise specified, all OSG taps conform to the dimensions listed above in USCTI Table 302.
Threading Technical
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