TAPERLESS CORE PINS

Type	Tolerance				Material
	Group	Shaft diameter (DorP)	Tip part (V,A)	Length (L,Y,F)	SKH51 equivalent	SKD61 equivalent	NAK80	SUS440C
	Standard	0 -0.005	0 -0.01	+0.02 0	CPHS-□□	CPPS-□□	CPKS-□□	CPWS-□□
	Precision	0 -0.005	0 -0.005	+0.01 0	CPVS-□□	CPZS-□□	-	-
	Extra Precision	0 -0.003	0 -0.003	+0.01 0	CPMS-□□	-	-	-
	Standard	0 -0.005	0 -0.01	+0.02 0	CPHBS-□□	CPPBS-□□	CPKBS-□□	CPWBS-□□
	Precision	0 -0.005	0 -0.005	+0.01 0	CPVBS-□□	CPZBS-□□	-	-
	Extra Precision	0 -0.003	0 -0.003	+0.01 0	CPMBS-□□	-	-	-
	Standard	0 -0.005	±0.01	+0.02 0	L-CPHS-□□	L-CPPS-□□	-	-
		0 -0.005	±0.01	+0.02 0	L-CPHBS-□□	L-CPPBS-□□	-	-
	Standard	0 -0.005	0 -0.01	+0.02 0	GV-CPHS-□□	GV-CPPS-□□	-	-
	Precision	0 -0.005	0 -0.005	+0.01 0	GV-CPVS-□□	GV-CPZS-□□	-	-
	Standard	0 -0.005	0 -0.01	+0.02 0	GV-CPHBS-□□	GV-CPPBS-□□	-	-
	Precision	0 -0.005	0 -0.005	+0.01 0	GV-CPVBS-□□	GV-CPZBS-□□	-	-
	Precision	0 -0.005	0 -0.005	+0.01 0	C□SV□□	C□SZ□□	-	-
		0 -0.005	0 -0.005	+0.01 0	C□SVB□□	C□SZB□□	-	-

Length (L/Y/F)tolerance varies depending on the selected shape.

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

Material		SKH51 Thermal die steel	SKD61 High speed tool steel	NAK80 Precipitation hardened steel group Pre hardened steel	SUS440C Martensite type stainless steel
Hardness　　　　HRC		58~60	48~52	37~43	56~60
Machining characteristics	Wear resistance	5	3.5	2	4
	Ability to be mirror-finished	4	4	5	4
	Toughness	3	5	1	3
	Corrosion resistance	3	3	3	5
Physical characteristics	Density [g/cm3]	8.2	7.75	7.8	7.78
	Modulus of longitudinal elasticity [kgf/mm2]	22300	21000	20500	20400
	Coefficient of thermal expansion [×10-6/°C]	10.1	10.8	12.5	10.2
	Thermal conductivity [cal/cm·sec·°C]	0.0509	0.061	0.1	0.058
Mechanical characteristics	Tensile strength [kgf/mm2]	235	135	128	200
	Charpy impact value [kgf·m/cm2]	2	6	2.2	1.5

Machining characteristics

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