Page 84 - TURNING CATALOG p635-848

THREADING Helix (Lead) angle area by using graph φ(φL) φ(φL) φ(φL) USER GUIDE
Helix angle evaluation
5° 4° 3° φ(φL)
T.P.I
2 2°

3 Pitch / Lead [inch] φ(φL)

4 1°
4.5

5
6
7
8
9
10
11.5 1121

5/8
3/4
1/8

1
1 1/8
1 1/4
1 3/8
1 1/2
1 5/8
1 3/4

2
2 1/4
2 1/2
2 3/4

3
3 1/4
3 1/2
3 3/4

4
4 1/4
4 1/2
4 3/4

5

Diameter [inch]

Detailed view for small pitch/diameter φ(φL) φ(φL) φ(φL) φ(φL)

T.P.I 5° 4° 3° 2°
13
14
16

18

Pitch / Lead [inch] 19 φ(φL)
20
1°

22

26 24
28
27

32

36
40
44 48
56
60 64
72 80

1/64
1/32
1/16
3/32
1/8
5/32
3/16
7/32
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4

Diameter [inch]

718 ISCAR