Page 30 - THREADING CATALOG
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USER GUIDE
THREAD TURNING Helix Angle Evaluation φ(φ L ) φ(φ L ) φ(φ L ) φ(φ L )
Helix (Lead) Angle Area by Using Graph
T.P.I
4°
2°
3°
5°
2
pitch / lead [inch] 3 4 φ(φ L )
1°
4.5
5
6
7
8
9
10
11.5 11
12
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
T.P.I φ(φ L ) φ(φ L ) φ(φ L ) φ(φ L )
13 5° 4° 3° 2°
14
16
18
φ(φ L )
1°
pitch / lead [inch] 26 20
19
22
24
27
28
32
36
40
44 48
60 56
72 64
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]
ISCAR
28
