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