Turning External Machining
Internal Boring Bar Denomination System
A20R-S C L C R09- 22
Min. Boring Dia.
1
2
3
4
5
6
7
8
9
1-boring Bar Material
2- Shank Diameter
3-boring Bar Length Q：180
4-Clamping Type C： Top clamping W：
R：200
A： Steel shank (with internal coolant) E： Carbide shank (with internal coolant)
S： Steel shank
Wedge clamping
S：250
T：300
S： Screw clamping M： Multiple clamping
P： Lever clamping
20mm
U：350
V：400
C： Carbide shank
W：450
Y：500
6-Approaching Angle
5-Insert Shape
C：80° Rhombic D：55° Rhombic
107.5°
90°
95°
117.5°
75°
F
E
L
P
Q
S
45°
R：Round
S：90° Square
T：60° Triangle
V：35° Rhombic
93°
110°
85°
60°
93° (95° )
U
W
Y
X
Z
W：Trigon
7-Clearance Angle
8-Hand of Tool
9-Length of Cutting Edge
B： 5° positive angle
C： 7° positive angle
R： Right hand
S
R
L
L
L
T
D： 15° positive angle
E： 20° positive angle
L： left hand
D,J,Y
V
N： 0° Negative angle
P： 11° positive angle
N： Neutral
L
L
L
125
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