TAPERLESS CENTER PINS

TAPERLESS ONE-STEP CENTER PINS

							Center pin shaft dia- meter tole- rance	Appli- cable ejector sleeve hoel(V) tole- rance
			***Tip(A) tolerance		Tip(A) tolerance
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
	4mm (T4)	0 -0.005	CPHS-5□	CPHSG-5□	CPVS-5□	CPVSG-5□	0 -0.005	+0.005 0
		-0.01 -0.02	CPHSE-5□	CPHSGE-5□	CPVSE-5□	CPVSGE-5□	-0.01 -0.02	+0.01 0 or H7
	6·8mm (JIS)	0 -0.005	CPHSJ-5□	CPHSJG-5□	CPVSJ-5□	CPVSJG-5□	0 -0.005	+0.005 0
		-0.01 -0.02	CPHSJE-5□	CPHSJGE-5□	CPVSJE-5□	CPVSJGE-5□	-0.01 -0.02	+0.01 0 or H7
	4mm (T4)	*Reference tolerance -0.01 -0.02	CPNS-5□	** CPNSG-5□	-	-	-0.01 -0.02	+0.01 0 or H7
	6·8mm (JIS)		CPJS-5□	** CPJSG-5□	-	-
	4mm (T4)	*Reference tolerance -0.01 -0.02	RDCPNS-5□	-	-	-	-0.01 -0.02	+0.01 0 or H7
	6·8mm (JIS)		RDCPJS-5□	-	-	-

*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.
**For,the shaft diameter is designated by 0.1 mm increments.***For,tip(A) tolerance is .

TAPERLESS ONE-STEP CENTER PINS WITH COOLING HOLE

Material		SKD61 equivalent +Nitrided		Head		4mm(T4) 6·8mm(JIS)
Part No.		RDCPNS-5□ RDCPJS-5□		Tip

Shape	Material	Part Number	Page
STEPPED ONE-STEP CENTER PINS	SKH51 equivalent	CPHB-5□ CPHBJ-5□ CPVB-5□ CPVBJ-5□	Listed in stepped center pin index	-
	SKD61 equivalent + Nitrided	CPNB-5□ CPJB-5□		-
	SKD61 equivalent	CPDB-5□		Published on Internet
TWO-STEP CENTER PINS·STEPPED TWO-STEP CENTER PINS	SKH51 equivalent	C□H5□ C□HE5□		-
		C□HB5□		-

Selection Method for Taperless One-step Center Pins

Material characteristics of taperless center pins

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

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.