STI General Tap Dimensions Screw Thread Inserts General Tap Dimensions - Inch (USCTI Table 322)
Blank Style 1
Blank Style 2
Blank Style 3
Tap Dimensions (Inch)
Threads Per Inch
Blank Design No.
Nominal SIze
Table 302 Blank Equivalent
BLANK DESIGN 1
Size of Square
UNC
UNF
A
B
C
D
1 2
64 56
– –
1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3
1.810 1.880 1.880 1.940 1.940 2.000 2.000 2.130 2.380 2.130 2.380 2.380 2.500 2.500 2.720 2.720 2.720 2.940 2.940 3.380 3.160 3.590 3.380 3.810 3.590 4.030 3.810 4.250 4.030 4.690 4.470 5.130 5.130 5.750 5.440
0.500 0.560 0.560 0.630 0.630 0.690 0.690 0.750 0.880 0.750 0.940 0.940 1.000 1.000 1.130 1.130 1.130 1.250 1.250 1.660 1.440 1.660 1.660 1.810 1.660 1.810 1.810 2.000 1.810 2.220 2.000 2.500 2.500 2.560 2.560
0.190 0.190 0.190 0.190 0.190 0.190 0.190 0.250 0.250 0.250 0.280 0.280 0.310 0.310 0.380 0.380 0.380 0.440 0.440 0.440 0.410 0.500 0.440 0.560 0.500 0.630 0.560 0.690 0.630 0.750 0.690 0.810 0.810 1.000 0.880
0.141 0.141 0.141 0.141 0.141 0.141 0.141 0.168 0.194 0.168 0.220 0.220 0.255 0.255 0.318 0.318 0.318 0.381 0.381 0.367 0.323 0.429 0.367 0.480 0.429 0.542 0.480 0.590 0.542 0.697 0.652 0.800 0.800 1.021 0.896
0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.131 0.152 0.131 0.165 0.165 0.191 0.191 0.238 0.238 0.238 0.286 0.286 0.275 0.242 0.322 0.275 0.360 0.322 0.406 0.360 0.442 0.406 0.523 0.489 0.600 0.600 0.766 0.672
No. 3 No. 4 No. 4 No. 5 No. 5 No. 6 No. 6 No. 8
–
64
48
–
3
–
56
40
–
4 5 6
–
48
40 32
– –
No. 10
–
40
No. 8
32
–
No. 12 No. 12
8
–
36
24
–
1/4 1/4
10 12
–
32
12 20
– –
5/16 5/16 5/16
1/4
–
28
18
–
3/8 3/8 1/2
5/16
–
24
16
–
3/8
–
24
7/16 9/16
14
–
7/16
–
20
1/2 5/8
13
–
1/2
–
20
9/16
12
–
11/16
9/16
–
18
5/8 3/4
11
–
5/8
–
18
11/16
10
–
7/8
3/4
– 9 – 8
16
13/16
–
1" 1"
7/8
14
3 3 3
–
1 1/4
1
– 1 1/8 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. 12
Threading Technical
765
osgtool.com
Powered by FlippingBook