Standard requirements: GB12718, DIN22252, PN - G - 46701 Safety number: 26*92 - D MCB220255 30*108-D MCB220265 34*126-D MCB220258 Scope of application: coal mine coal machine, scraping transport plane, scraping overloading machine, excavator, coal crushing machine, etc. d. Main characteristics: the use of international advanced professional automatic manufactured equipment, high-quality alloy steel as raw material, a wide range of products, a full class.