Threading Tools STH
Screw-on for External Diameter
External
Metric Thread Whitworth Thread
External Threading STH
Fig 1
7
LF
Maximum machining step=6.5
F
HBL
Figure shows right hand (R) tool.
Holder
Parts
Dimensions ( mm )
Bottom Offset
Cutting Edge Height
Overall Length
Flat Screw
Wrench
Stock
Step
Height Width
Applicable Insert
Cat. No.
Fig
R L
H B LF
HF HBH HBL
STH R/L0810 STH R/L1010 STH R/L1212F STH R/L1212 STH R/L1616H STH R/L1616 STH R/L2020
8
10 120 10 120
8
4 2
15 15 15 15 15 15 15
1 1 1 1 1 1
BFTX0410NTW
10 12 12 16 16 20
10 12 12 16 16 20
12
85
- - - - -
RT08
12 120 16 100 16 120
TH R/L Type
BFTX0412NTW
20
80
1 BFTX0410NT LT25NT
Insert (
Coated Carbide)
Dimensions ( mm )
Overall Length
Nose Radius
X direction
Thread Ridge Angle
Cutting Edge Shape
Fig 1
ACZ150
Pitch
Height
RE
Applicable Holder
Cat. No.
Fig
PNA
R L mm Threads/Inch L W1 RE PDX PNA
TH R/L6002075A 0.20 to 0.75 TH R/L6002075B 0.20 to 0.75 TH R/L6005125A 0.50 to 1.25 TH R/L6005125B 0.50 to 1.25
20 8 20 8
0.40 60 0.40 60
(A) (A) (B) (B) (B) (B) (B)
1 2 1 2 3 1 2
- - - - -
- -
Fig 2
(A) Flat Shape (B) Radius
RE
20 8 0.05 0.80 60 20 8 0.05 0.80 60 20 8 0.10 1.25 60
PNA
STH Type
50°
Fig 3
RE
L
TH R/L601015N TH R/L550515A TH R/L550515B
1.00 to 1.50
PNA
0.529 to 1.58 48 to 16 20 8 0.05 0.80 55 0.529 to 1.58 48 to 16 20 8 0.05 0.80 55
Figure shows right hand (R) tool.
Holder/Insert Combinations
Cutting Edge Position Feed Direction
Right Hand
Left Hand
Guide Bush Side Guide Bush
Back Turning Side
Guide Bush Side
Back Turning Side
Threading Illustration
Holders Insert
TH R····A STH R (Right Hand)
TH R····B STH R (Right Hand)
TH L····B STH L (Left Hand)
TH L····A STH L (Left Hand)
With a left hand holder used, a suf cient cutting distance can be kept since the cutting edge position is separate from the guide bush. For the left-hand holder, the selection of A type and B type is the reverse of the right-hand holder. (B indicates the guide bush side while A indicates the back turning side.)
It is often used in common tooling for workpieces that have a thread at their top end. In this type of tooling, the undercutting width indicated with the arrow can be reduced since the cutting edge point is placed closer to the guide bush side.
Often used when a thread is at the middle of the workpiece or at the rear. In this type of tooling, the undercutting width indicated with the arrow can be reduced since the cutting edge point is placed closer to the back turning side.
Features
F86
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