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STEPPED CENTER PINS

One-Step Center Pins



Center
pin shaft
dia-
meter
tole-
rance
Appli-
cable
ejector
sleeve
hole(V)
tole-
rance
Tip(A, V)
tolerance
±0.02
(Reference value)
Tip(A, V)
tolerance
±0.01
(Reference value)
Tip(A, V)
tolerance
±0.005
(Reference value)
Material Head
Thick-
ness
(T)
Shaft diameter
tolerance
Shaft diameter
(D)
selection type
Shaft diameter
(P)
0.01mm increments
Shaft diameter
(D)
selection type
Shaft diameter
(P)
0.01mm increments
Shaft diameter
(D)
selection type
Shaft diameter
(P)
0.01mm increments
4mm
(T4)
0
-0.005
- - CPH-5□ CPHG-5□ CPV-5□ CPVG-5□ 0
-0.005
+0.005
0
-0.01
-0.02
CPXE-5□ CPXGE-5□ CPHE-5□ CPHGE-5□ CPVE-5□ CPVGE-5□ -0.01
-0.02
+0.01
0
or
H7
4mm
6mm
8mm
(JIS)
0
-0.005
- - CPHJ-5□ CPHJG-5□ CPVJ-5□ CPVJG-5□ 0
-0.005
+0.005
0
-0.01
-0.02
CPXJE-5□ CPXJGE-5□ CPHJE-5□ CPHJGE-5□ CPVJE-5□ CPVJGE-5□ -0.01
-0.02
+0.01
0
or
H7
4mm
(T4)
*Reference
tolerance
-0.01
-0.02
CPN-5□ **
CPNG-5□
CPNK-5□ **
CPNKG-5□
- - -0.01
-0.02
+0.01
0
or
H7
4mm
6mm
8mm
(JIS)
CPJ-5□ **
CPJG-5□
CPJK-5□ **
CPJKG-5□
- -
4mm
(T4)
*Reference
tolerance
-0.01
-0.02
RDCPN-5□ - - - - - -0.01
-0.02
+0.01
0
or
H7
6mm
8mm
(JIS)
RDCPJ-5□ - - - - -
4mm
(T4)
0
-0.005
- - CPP-5□ CPPG-5□ - - 0
-0.005
+0.005
0
-0.01
-0.02
CPD-5□ CPDG-5□ CPDK-5□ CPDKG-5□ - - -0.01
-0.02
+0.01
0
or
H7
The tolerance range varies depending on the selected shape. For details, refer to the catalog page of each product.
*The tolerance values for shaft diameter are representative ones. The tolerance range varies depending on the shaft size and/or length. For details, refer to the Catalog page of each product.
**Forthe shaft diameter is designated by 0.1 mm increments.

SELECTION METHOD FOR ONE-STEP CENTER PINS

Stepped One-step Center Pins



Tip dia-
meter
(P)
tole-
rance
Appli-
cable
ejector
sleeve
hole(V)
tole-
rance
Material Head
Thick-
ness
(T)
Tip
diameter
(P)
tolerance
Tip
(A, V)
tolerance
±0.02
(Reference value)
Tip
(A, V)
tolerance
±0.01
(Reference value)
Tip
(A, V)
tolerance
±0.005
(Reference value)
4mm
(T4)
0
-0.005
- CPHB-5□ CPVB-5□ 0
-0.005
+0.005
0
4mm
6mm
8mm
(JIS)
- CPHBJ-5□ CPVBJ-5□ 0
-0.005
+0.005
0
4mm
(T4)
*Reference
tolerance
-0.01
-0.02
CPNB-5□ - - -0.01
-0.02
+0.01
0
or
H7
4mm
6mm
8mm
(JIS)
CPJB-5□ - -
The tolerance range varies depending on the selected shape. For details, refer to the catalog page of each product.
* The tolerance values for shaft diameter are representative ones. The tolerance range varies depending on the shaft size and/or length. For details, refer to the Catalog page of each product.

Two-step Center Pins·Stepped Two-step Center Pins



  Two-step   Stepped Two-step         Two-step   Stepped Two-step
Material SKH51 equivalent   SKH51 equivalent     Head   4mm   4mm
Part No. C□H5□·C□HE5□   C□HB5□     Tip tolerance   ±0.01   ±0.01

Center Pins with Cooling Hole



Material   SKD61equivalent
+Nitrided
  Head   4mm(T4) 6·8mm(JIS)
Part No.   RDCPN-5□ RDCPJ-5□   Tip tolerance   ±0.02

Material characteristics of stepped center pins

Material High Speed
Steel SKH51
Dies Steel
SKD61+Nitrided
Dies Steel
SKD61
Hardness   HRC 58~60 Surface:900HV~
Base material:40~45
50~55
Machining
characteristics
Wear resistance 5 4 4
Ability to be mirror-finished 4 3 4
Toughness 3 4 5
Corrosion resistance 3 3 3
Physical
characteristics
Density [g/cm3] 8.2 7.75 7.75
Modulus of longitudinal elasticity [kgf/mm2] 22300 21000 21000
Coefficient of thermal expansion [×10-6/°C] 10.1 10.8 10.8
Thermal conductivity [cal/cm·sec·°C] 0.051 0.061 0.061
Mechanical
characteristics
Tensile strength [kgf/mm2] 235 135 135
Charpy impact value [kgf·m/cm2] 2 4 6
Machining characteristics

Conversion formula
1kgf/mm2=9.81N/mm2
1cal/cm·sec·°C=418.6W/M.K
1kgf·m/cm2=9.81J/cm2

Use these data for reference only as they are dependent on specific heat treatment and usage conditions.

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