Threading Tools STH Type
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 )
Cutting Edge Height
Bottom Offset
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
1 1 1 1 1 1
8
10 120
8
4
15
BFTX0410NTW
10
10 120
10
2
15
12
12
85
12
15
-
RT08
TH R/L Type
12
12 120
12
15
-
BFTX0412NTW
16
16 100
16
15
-
16
16 120
16
15
-
1 BFTX0410NT LT25NT
20
20
80
20
15
-
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
(A) (A)
1 2
20 8
0.40 60
-
-
Fig 2
(A) Flat Shape (B) Radius
RE
20 8
0.40 60
-
-
PNA
(B)
1
20 8 0.05 0.80 60
-
STH Type
50°
(B)
2
20 8 0.05 0.80 60
-
Fig 3
RE
L
« « 1.00 to 1.50
TH R/L601015N TH R/L550515A TH R/L550515B
(B)
3
20 8 0.10 1.25 60
-
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
(B) (B)
1 2
Figure shows right hand (R) tool.
Holder/Insert Combinations
Feed Direction
Right Hand
Left Hand
Cutting Edge Position
Guide Bush Side
Back Turning Side
Guide Bush Side
Back Turning Side
Guide Bush
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 sufficient cutting distance can be kept since the cutting edge position is separate from the guide bush.
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
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.)
F76
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