STI General Tap Dimensions Screw Thread Inserts General Tap Dimensions - Metric (USCTI Table 322A)
Blank Style 1
Blank Style 2
Blank Style 3
Tap Dimensions (Inch)
Pitch
Blank Design No.
Nominal SIze
Table 302 Blank Equivalent
Size of Square
M BLANK DESIGN 1 MF
A
B
C
D
M2.2 M2.5
0.45 0.45
– – – – – – – – – 1 – 1 –
1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
1.880 1.940 2.000 2.130 2.380 2.500 2.720 2.940 2.940 2.940 3.380 3.380 3.160 3.590 3.590 3.590 4.030 3.810 4.250 4.030 4.690 4.470 4.470 4.910 4.910 4.690 5.130 5.130 4.910 5.440 5.130
0.560 0.630 0.690 0.750 0.880 1.000 1.130 1.250 1.250 1.250 1.660 1.660 1.440 1.660 1.660 1.660 1.810 1.810 2.000 1.810 2.220 2.000 2.000 2.220 2.220 2.220 2.500 2.500 2.220 2.560 2.500
0.190 0.190 0.190 0.250 0.250 0.310 0.380 0.440 0.440 0.440 0.440 0.440 0.410 0.500 0.500 0.500 0.630 0.560 0.690 0.630 0.750 0.690 0.690 0.750 0.750 0.750 0.810 0.810 0.750 0.880 0.880
0.141 0.141 0.141 0.117 0.194 0.255 0.318 0.381 0.381 0.381 0.367 0.367 0.323 0.429 0.429 0.429 0.542 0.480 0.590 0.542 0.697 0.652 0.652 0.760 0.760 0.697 0.800 0.800 0.760 0.896 0.896
0.110 0.110 0.110 0.131 0.152 0.191 0.238 0.286 0.286 0.286 0.275 0.275 0.242 0.322 0.322 0.322 0.406 0.360 0.442 0.406 0.523 0.489 0.489 0.570 0.570 0.523 0.600 0.600 0.570 0.672 0.672
No. 4 No. 5 No. 6 No. 8
M3
0.5 0.6 0.7 0.8
M3.5
M4 M5 M6 M7 M8
No. 10
1/4
1 1
5/16
3/8 3/8 3/8 1/2 1/2
1.25
–
1.5
M10
– – – – 2 – 2 – – – – – – – 3 –
1.25
7/16 9/16 9/16 9/16
1.75
M12
1.5
1.25
–
11/16
M14
1.5
5/8 3/4
–
M16
1.5
11/16
2.5
– 2 – 2 – 2 – 2
7/8
M18
13/16 13/16 15/16 15/16
1.5
2.5
M20
1.5
7/8
2.5
1" 1"
M22
1.5
15/16 1 1/8
M24
1 1/16 These taps are oversize to the extent that the internal thread they produce will accommodate a helical coil screw thread insert, which, at final assembly, will accept a screw thread of the normal size and pitch.
Threading Technical
766
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