Granite Guideways
Granite rail is used in CMM, drilling& milling machines for PC board,Laser machines and CNC as a guideway with Grade00 of DIN876/GB/JIS .
Physical Property of Jinan Black Granite:
Specific Gravity: 3.03 g/cm3
Shore Hardness: > 70Hs-80Hs
Tensile strength: 211Kg/cm2
Compressive Strength: 245-254Mpa
Linear Expansion Coefficient: 4.61´10--6/°C
Elastic Modulus: 30-50Gpa
Water Absorptivity: ≤0.13%
Black Granite Plates are in black color with bright, homogeneous structure,good stability, high hardness, anti-rust and chemical-resistance.
Material: Black Jinan granite, India Black Granite
Standard: GB/T 20428-2006, DIN876, JIS
Specification: The maximum workability is 10000mm in length, 8000mm in width and 800mm in height or customize (special size is acceptable following customers’ requirement)
Surface: T-slots, dovetail-shaped slots, holes, etc.
Hardness of the working surface: more than HS70
Surface treatment: ground finish
Precision grade: 00-1
Packaging: Export wooden box