STEPS-TYPE ROUND CORE PINS

One-step Core Pins

Minimum()=0.3 is available for the short tip() type,
depending on the shape you select. For details, refer to each page.
Type Group Head
thickness
(T)
Tolerance Material
Shaft diameter
(D or P)
Shaped part
(A,V)
Length
(L,F)
SKH51
equivalent
SKD61
equivalent
NAK80 DH2F
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
CPM-1□□ - - -
Tip short
S-CPM-1□□
- - -
Precision 0
-0.005
±0.005 +0.01
0
CPV-1□□ CPZ-1□□ - -
Tip short
S-CPV-1□□
Tip short
S-CPZ-1□□
- -
Standard 0
-0.005
±0.01 +0.02
0
CPH-1□□ CPP-1□□ CPK-1□□ CPG-1□□
Tip short
S-CPH-1□□
Tip short
S-CPP-1□□
- -
-0.01
-0.02
±0.015 CPX-1□□ CPD-1□□ CPN-1□□ CPF-1□□
Tip short
S-CPX-1□□
Tip short
S-CPD-1□□
- -
6·8mm
(JIS)
-0.01
-0.02
±0.015 - CPDJ-1□□ - -
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
CPMB-1□□ - - -
Tip short
S-CPMB-1□□
- - -
Precision 0
-0.005
±0.005 +0.01
0
CPVB-1□□ CPZB-1□□ - -
Tip short
S-CPVB-1□□
Tip short
S-CPZB-1□□
- -
Standard 0
-0.005
±0.01 +0.02
0
CPHB-1□□ CPPB-1□□ CPKB-1□□ CPGB-1□□
Tip short
S-CPHB-1□□
Tip short
S-CPPB-1□□
- -
-0.01
-0.02
±0.015 CPXB-1□□ CPDB-1□□ CPNB-1□□ CPFB-1□□
Tip short
S-CPXB-1□□
Tip short
S-CPDB-1□□
- -
6·8mm
(JIS)
-0.01
-0.02
±0.015 - CPDJB-1□□ - -
Standard 4mm(T4) 0
-0.005
±0.01 +0.02
0
L-CPH-1□□ - - -
-0.01
-0.02
±0.015 - L-CPD-1□□ - -
Standard 4mm
(T4)
0
-0.005
±0.01 +0.02
0
L-CPHB-1□□ - - -
-0.01
-0.02
±0.015 - L-CPDB-1□□ - -
Precision 4mm
(T4)
0
-0.005
±0.005 +0.01
0
GW□-CPV-1□□ - - -
Standard 0
-0.005
±0.01 +0.02
0
GW□-CPH-1□□ - - -
-0.01
-0.02
±0.015 GW□-CPX-1□□ - - -
Precision 4mm
(T4)
0
-0.005
±0.005 +0.01
0
GW□-CPVB-1□□ - - -
Standard 0
-0.005
±0.01 +0.02
0
GW□-CPHB-1□□ - - -
-0.01
-0.02
±0.015 GW□-CPXB-1□□ - - -
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
GV-CPM-1□□ - - -
Precision 0
-0.005
±0.005 +0.01
0
GV-CPV-1□□ GV-CPZ-1□□ - -
Standard 0
-0.005
±0.01 +0.02
0
GV-CPH-1□□ GV-CPP-1□□ GV-CPK-1□□ GV-CPG-1□□
-0.01
-0.02
±0.015 GV-CPX-1□□ GV-CPD-1□□ GV-CPN-1□□ GV-CPF-1□□
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
GV-CPMB-1□□ - - -
Precision 0
-0.005
±0.005 +0.01
0
GV-CPVB-1□□ GV-CPZB-1□□ - -
Standard 0
-0.005
±0.01 +0.02
0
GV-CPHB-1□□ GV-CPPB-1□□ GV-CPKB-1□□ GV-CPGB-1□□
-0.01
-0.02
±0.015 GV-CPXB-1□□ GV-CPDB-1□□ GV-CPNB-1□□ GV-CPFB-1□□

Type Group Head
thickness
(T)
Tolerance Material
Shaft diameter
(D or P)
Shaped part
(A,V)
Length
(L,F)
STAVAXESRR
Hardening
steel
PROVA400
Hardening steel
SUS440C MAS1C
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
- - - -
- - - -
Precision 0
-0.005
±0.005 +0.01
0
- - - -
- - - -
Standard 0
-0.005
±0.01 +0.02
0
CPEH-1□□ CPRH-1□□ CPW-1□□ CPY-1□□
- - - -
-0.01
-0.02
±0.015 CPTH-1□□ CPQH-1□□ - CPA-1□□
- - - -
6·8mm
(JIS)
-0.01
-0.02
±0.015 - - - -
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
- - - -
- - - -
Precision 0
-0.005
±0.005 +0.01
0
- - - -
- - - -
Standard 0
-0.005
±0.01 +0.02
0
CPEHB-1□□ CPRHB-1□□ CPWB-1□□ CPYB-1□□
- - - -
-0.01
-0.02
±0.015 CPTHB-1□□ CPQHB-1□□ - CPAB-1□□
- - - -
- - - -
- - - -
6·8mm
(JIS)
-0.01
-0.02
±0.015 - - - -
Standard 4mm(T4) 0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Standard 4mm
(T4)
0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Precision 4mm
(T4)
0
-0.005
±0.005 +0.01
0
- - - -
Standard 0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Precision 4mm
(T4)
0
-0.005
±0.005 +0.01
0
- - - -
Standard 0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
- - - -
Precision 0
-0.005
±0.005 +0.01
0
- - - -
Standard 0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Extra
precision
4mm
(T4)
0
-0.003
±0.005 +0.01
0
- - - -
Precision 0
-0.005
±0.005 +0.01
0
- - - -
Standard 0
-0.005
±0.01 +0.02
0
- - - -
-0.01
-0.02
±0.015 - - - -
Tip tolerance values of tip(A,V)and length(L,F)are for reference only. The tolerance range varies depending on the shape selected. For details, refer to the Catalog page for each product.
"PROVA400 Hardening steel " and "MAS1C" will be discontinued when stocked materials are finished.

Free Designation One-step Core Pins(TiCN coating)

Type Tolerance Material
Shaft diameter
(D or P)
Shaped part
(A,V)
Length
(L,F)
SKH51
equivalent
SKD61
equivalent
SKD61
equivalent
(TiCN coating)
0
-0.005
±0.01 +0.02
0
F-CPHB1□□ - -
-0.01
-0.02
*±0.015 +0.02
0
- F-CPDB1□□ HF-CPDB1□□
Tip tolerance values of tip(A,V)and length(L,F)are for reference only. The tolerance range varies depending on the shape selected. For details, refer to the Catalog page for each product.
TiCN coating is A±0.02,V±0.02.

Two-step Core Pins

Minimum()=0.6 is available for the short tip() type,
depending on the shape you select. For details, refer to each page.
Type Group Tolerance Material
Shaft
diameter
(D or P)
Shaped part
(A,V,J,E)
Length
(L,Y,F)
SKH51
equivalent
SKD61
equivalent
NAK80 DH2F SUS440C MAS1C
Precision 0
-0.005
±0.005 +0.01
0
C□V□ C□Z□ - - - -
Standard 0
-0.005
±0.01 +0.02
0
C□H□ C□P□ C□K□ C□G□ C□W□ C□Y□
-0.01
-0.02
±0.015 C□X□ C□D□ C□N□ C□F□ - C□A□
Precision 0
-0.005
±0.005 +0.01
0
C□VB□ C□ZB□ - - - -
Standard 0
-0.005
±0.01 +0.02
0
C□HB□ C□PB□ C□KB□ C□GB□ C□WB□ C□YB□
-0.01
-0.02
±0.015 C□XB□ C□DB□ C□NB□ C□FB□ - C□AB□
Tip tolerance values of tip(A,V,J,E)and length(L,Y,F)are for reference only. The tolerance range varies depending on the shape selected. For details, refer to the Catalog page for each product.

Selection method for one-step core pins

Selection method for two-step core pins

Material Characteristics of Steps-type Round Core Pins

Use these data for reference only as they are dependent on specific heat treatment and usage conditions.
PROVA400 is equivalent to SUS420J2 upgrading steel from Fujikoshi.
Material SKH51
High speed
tool steel
SKD61
Thermal
die steel
NAK80
Precipitation
type
prehardened
steel
DH2F
SKD61-type
prehardened
steel
Hardness    HRC 58~60 48~52 37~43 38~42
Machining
characteristics
Wear resistance 5 3.5 2 3
Ability to be mirror-finished 4 4 5 3
Toughness 3 5 1 4
Corrosion resistance 3 3 3 3
Physical
characteristics
Density [g/cm3] 8.2 7.75 7.8 7.75
Modulus of longitudinal elasticity [kgf/mm2] 22300 21000 20500 21000
Coefficient of thermal expansion [×10-6/°C] 10.1 10.8 12.5 10.8
Thermal conductivity [cal/cm·sec·°C] 0.0509 0.061 0.1 0.061
Mechanical
characteristics
Tensile strength [kgf/mm2] 235 135 128 135
Charpy impact value [kgf·m/cm2] 2 6 2.2 4

Material STAVAXESRR
Hardening steel
PROVA400
Hardening steel
SUS440C
Martensite
type
stainless
steel
MAS1C
Maraging Steel
Hardness    HRC 50~54 50~54 56~60 50~54
Machining
characteristics
Wear resistance 4 4 4 3.5
Ability to be mirror-finished 5 5 4 5
Toughness 5 5 3 5
Corrosion resistance 5 5 5 3
Physical
characteristics
Density [g/cm3] 7.8 7.8 7.78 8.02
Modulus of longitudinal elasticity [kgf/mm2] 20400 21900 20400 18600
Coefficient of thermal expansion [×10-6/°C] 11.0 10.9 10.2 10.1
Thermal conductivity [cal/cm·sec·°C] 0.055 0.058 0.058 -
Mechanical
characteristics
Tensile strength [kgf/mm2] 196 200 200 215
Charpy impact value [kgf·m/cm2] - - 1.5 5

Process characteristics


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

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