SPIRAL FLUTE TAPS
SFT :
This tap by premium grade high speed steel for rigidity and wear resistence, suitable for blind hole tapping of carbon steel, alloy steel, and nonferrous metals, whose chips are produced in continous coil form.
TIN-SFT :
This tap for superior wear and welding resistance suitable for tapping in low-medium carbon steel and stainless steel.
DH-SFT :
This tap is suitable for tapping blind deep hole, the design reduces damage caused by chip packing and minimizes the problem of galling.
|
Metric thread nominal size |
Tap limit |
Specification |
Class 2 drill hole dia |
||||
|
A |
B |
C |
E |
F |
|||
|
M3 x 0.5 |
H2,H3 |
46 |
9 |
4 |
6 |
3.2 |
2.6 |
|
M4 x 0.7 |
H2,H3 |
52 |
12 |
5 |
7 |
4 |
3.4 |
|
M5 x 0.8 |
H2,H3 |
60 |
14.5 |
5.5 |
7 |
4.5 |
4.3 |
|
M6 x 1.0 |
H2,H3 |
62 |
17.5 |
6 |
7 |
4.5 |
5.1 |
|
M8 x 1.25 |
H2,H3 |
70 |
22 |
6.2 |
8 |
5 |
6.8 |
|
M10 x 1.5 |
H2,H3 |
75 |
24 |
7 |
8 |
5.5 |
8.6 |
|
M12 x 1.75 |
H2,H3 |
82 |
29 |
8.5 |
9 |
6.5 |
10.4 |
|
M14 x 2 |
H2,H3 |
88 |
30 |
10.5 |
11 |
8 |
12.2 |
|
M16 x 2 |
H3,H4 |
95 |
32 |
12.5 |
13 |
10 |
14.2 |
|
M18 x 2.5 |
H3,H4 |
100 |
37 |
14 |
14 |
11 |
15.7 |
|
M20 x 2.5 |
H3,H4 |
105 |
37 |
15 |
15 |
12 |
17.7 |
|
M22 x 2.5 |
H3,H4 |
115 |
38 |
17 |
16 |
13 |
19.7 |
|
M24 x 3 |
H3,H4 |
120 |
45 |
19 |
18 |
15 |
21.2 |
|
Unified thread nominal size |
Tap limit |
Specification |
Class 2B drill hole dia |
||||
|
A |
B |
C |
E |
F |
|||
|
NO.5-40 UNC |
H2,H3 |
46 |
9 |
4 |
6 |
3.2 |
2.7 |
|
NO.6-32 UNC |
H2,H3 |
48 |
11 |
4 |
6 |
3.2 |
2.9 |
|
NO.8-32 UNC |
H2,H3 |
52 |
12 |
5 |
7 |
4 |
3.5 |
|
NO.10-24 UNC |
H2,H3 |
60 |
14.5 |
5.5 |
7 |
4.5 |
3.9 |
|
NO.12-24 UNC |
H2,H3 |
60 |
14.5 |
5.5 |
7 |
4.5 |
4.6 |
|
1/4-20 UNC |
H2,H3 |
62 |
17.5 |
6 |
7 |
4.5 |
5.3 |
|
5/16-18 UNC |
H2,H3 |
70 |
22 |
6.1 |
8 |
5 |
6.7 |
|
3/8-16 UNC |
H2,H3 |
75 |
24 |
7 |
8 |
5.5 |
8.2 |
|
7/16-14 UNC |
H2,H3 |
80 |
25 |
8 |
9 |
6 |
9.5 |
|
1/2-13 UNC |
H2,H3 |
85 |
29 |
9 |
10 |
7 |
11.0 |
|
9/16-12 UNC |
H3,H4 |
90 |
30 |
10.5 |
11 |
8 |
12.3 |
|
5/8-11 UNC |
H3,H4 |
95 |
32 |
12 |
12 |
9 |
13.8 |
|
3/4-10 UNC |
H3,H4 |
105 |
37 |
14 |
14 |
11 |
16.8 |
|
7/8-9 UNC |
H3,H4 |
115 |
38 |
17 |
16 |
13 |
19.6 |
|
1"-8 UNC |
H3,H4 |
125 |
45 |
20 |
18 |
15 |
22.5 |
The specification of standard coarse screw thread and standard fine screw thread are the same.