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Cutting Tools
7. Cutting edge length
8. Additional Information
Example:
Cutting edge length = 16.5 mm
Symbol = 16
Helix angle
λ
0 = Helix angle
λ
0°
1 = Helix angle
λ
1°
Cut direction option depends on:
• Workpiece (outer or inner thread, right or left thread)
• Machine (Right or left tool)
Cutting direction to the headstock
Right thread - right tool
Left thread - left tool
ER
First option
IR
EL
First option
IL
3. Cut direction
S
1
E
2
R
3
25
4
25
5
M
6
16
7
8
Cutting direction towards tailstock
1. Clamp system
2. Outer/Inner
4. Shank height
Left-hand thread – right-hand tool
Right-hand thread – left-hand tool
ER
IR
First option
EL
IL
First option
S
Screw
25 = 25 mm
32 = 32 mm
L
R
E = Outer
I = Inner
6. Tool length
H = 100 mm
K = 125 mm
L = 140 mm
M = 150 mm
P = 170 mm
Q = 180 mm
R = 200 mm
S = 250 mm
T = 300 mm
U = 350 mm
V = 400 mm
5. Shank width/Diameter
12 = 12 mm
20 = 20 mm
25 = 25 mm
Machining methods
Thread cutting - ISO Code
538