Thread Turning Inserts
Whitworth - 55º
BSW, BSF, BSP, BSB
Type B
Ground Profile with Sintered Chip-breaker
EX-RH IN-RH
EXTERNAL
INTERNAL
Pitch
TPI
L
I.C.
in
Ordering Code
Right Hand
Ordering Code
Right Hand
X
Y
19
16
3/8
16
16
16
16
3/8
3/8
3/8
3/8
16 ER B 19 W
16 ER B 16 W
16 ER B 14 W
16 ER B 11 W
16 ER B 10 W
16 IR B 19 W
16 IR B 16 W
16 IR B 14 W
0.8
16
14
1.0
1.1
1.2
1.5
1.5
11
10
0.9
1.0
1.1
1.1
16 IR B 11 W
16 IR B 10 W
Order example: 16 IR B 10 W BMA
L
X
Vertical
T
Y
Pitch
TPI
L
I.C.
in
19
14
11
16
16
16
3/8
3/8
3/8
I.C.
EXTERNAL
Ordering Code
Right Hand
X
Y
T
16V ER 19 W
16V ER 14 W
16V ER 11 W
1.0
0.9
1.2
1.5
3.6
3.6
3.6
1.0
1.0
Order example: 16V ER 14 W MXC
Y
Multitooth
EX-RH
IN-LH
X
I.C.
IN-RH
EX-LH
Y
X
I.C.
L
L
I.C.
in
Number
of Teeth
EXTERNAL
16
3/8
2
16 ER 14 W 2M
AE16M
14
22
1/2
11
22
1/2
3
2
22 ER 14 W 3M
22 ER 11 W 2M
AE22M
AE22M
Pitch
TPI
L
14
Anvil
INTERNAL
Anvil
X
Y
16 IR 14 W 2M
AI16M
1.7
2.7
22 IR 14 W 3M
AI22M
AI22M
2.8
4.5
2.3
3.4
Ordering Code
Ordering Code
22 IR 11 W 2M
Order example: 22 IR 14 W 3M BMA
For recommended number of passes see page 45
For Carbide Grade and Cutting Speed see page 44
17
Thread Turning Technical Section
Carbide Grade Selection
Choose the C.P.T. grade specifically formulated for your application from the following list:
Coated Grades
Uncoated Grades
P30 •
Carbide grade for carbon and cast
(P20-P30) steels, works well at medium to low
cutting speeds.
PVD TiN coated grade for treated and
hard alloy steels (25 HRc & up) at
medium to low cutting speeds.
P25C
(P15-P35)
MXC
PVD TiN coated micrograin for free
cutting untreated alloy steels (below 30
HRc), for stainless steels and cast iron.
BMA
PVD TiALN coated sub-micrograin grade
for stainless steels and exotic materials
at medium to high cutting speeds.
BXC ••
PVD TiN coated grade for low cutting
speed. Works well with wide range of
stainless steels.
(K10-K20)
(P10-P25)
K20 •
Carbide grade for non ferrous
(K10-K30) metals, aluminum and cast iron.
(P20-P40)
(K20-K30)
(P30-P50)
(K25-K40)
Note:
Due to our unique and specialized production techniques, C.P.T. coated inserts
provide superior cutting performance and exceptionally long tool life.
Recommended cutting speed (m/min) for thread turning inserts
Coated
ISO
Standard
P25C •
Materials
Steel:
P
M
K
N
S
H
Uncoated
MXC
BMA
BXC ••
P30 •
K20•
Low & Medium Carbon Steels
80-160
90-160
100-180
20-100
70-120
High Carbon Steels
80-120
80-150
90-160
30-80
60-100
Alloy Steels, Treated Steels
50-100
80-120
90-120
40-90
50-80
Cast Steel
80-140
100-140
120-160
30-80
50-100
70-120
90-130
30-90
70-100
80-130
80-150
30-90
60-100
20-200
120-200
Stainless steel: Cast steels
Stainless austenitic and austenitic
ferritic steel and cast steel
Cast iron:
Grey cast iron, cast iron with spherical
graphite, malleable cast iron
80-100
Nonferrous Metal:
300-600
Aluminium and other nonferrous metals,
copper alloys non metallic
Super-alloys and Titanium:
Heat resistant special alloys based on iron,
nickel and cobalt, titanium and titanium alloys
Hard Materials:
Hardened steel, hardened cast iron
materials, chilled cast iron
40-80
50-100
15-30
20-40
30-50
15-30
• Upon request
•• For miniature and ultra miniature insert
Conversion of Cutting Speed to Rotational Speed
Conversion of a
selected cutting
speed to rotational
speed is calculated
by the following
formula:
Example
N
D= m
m
30
V=120 m/min
44
V x 1000
N=
πx D
120 x 1000
=
=1274 RPM
3.14 x 30
Thread Turning Technical Section
Anvil Change Recommendation
Pitch
TPI mm
10
9
3
8
3.5
7
4
6
5
5
6
4
3.5
3
2.5
2
1.5
8
10
12
16
Standard anvil
(supplied with
toolholder)
Pitch
TPI mm
ε
50
2
60
70
80
3
2.50
90
100
4
110
120
O
130
140
5
Diameter
As can be seen from the chart, most applications do not require an anvil change. If change is required, use AE
anvils for EX-RH and IN-LH toolholders and AI anvils for IN-RH and EX-LH toolholders
10
7
4
6
5
5
6
4
3.5
3
2.5
2
1.5
Pitch
TPI mm
I+4
.
Special
holder
required
3
8
3.5
7
4
6
5
5
6
4
3.5
3
2.5
2
1.5
60
70
80
3
2.50
90
100
4
110
120
130
5
140
Diameter
As can be seen from the chart, most applications require an anvil change. In most cases a negative anvil is
required. use AE anvils for EX-RH
10
9
50
2
AMERICAN BUTTRESS
SAGENGEWINDE (DIN 513)
Standard anvil
(supplied with
toolholder)
AE
or A
I+2 O
.5
2.5
standard anvil
(supplied with
toolholder)
5 10
20
40
30
0.25 0.50 0.75 1 1.25 1.50
mm:
Inch:
PARTIAL PROFILES 60O
PARTIAL PROFILES 55O
ISO
UN
WHIT.
NPT
BSPT
I+3 O
AE
.5
or
AI+
2.5 O
3.5
or A
8
AE
3
AE
Special
holder
required
or A
9
8
10
12
16
1.5ο
Toolholder
Change to anvil AE or AI+0.5
5O
2.5
β
Anvil
30
40
5 10
20
0.25 0.50 0.75 1 1.25 1.50
mm:
Inch:
ACME
STUB ACME
TRAPEZ (DIN 103)
ROUND (DIN 405)
Special
Holder
holder
Required
required
AE
or A
I+4 O
AE
.5
or
AI+
3.5 O
AE
or
AI
+2
.5 O
2.5
As can be seen from the chart, some Pitch to Diameter combinations require an anvil change. If change is
required, use AE anvils for EX-RH and IN-LH toolholders and AI anvils for IN-RH and EX-LH toolholders.
β=1
ο
ε=0.74
γ=1.5ο
Change to negative anvil AE or AI-1.5
Bad
Std. anvil
O
Before Anvil change
8
10
12
16
mm:
Inch:
5 10
20
40
30
0.25 0.50 0.75 1 1.25 1.50
Replacing the standard anvil with
an anvil with negative angle,
will eliminate side rubbing
ε=3.74
50
2
60
70
80
3
2.50
90
100
4
110
120
130
5
140
Diameter
γ=−1.5ο
negative anvil
After Anvil Change
48
Correct