... ") 3.Length:50mm-1500mm 4.Material:carton steel Liner Bolts (D bolt,waist type bolt,oval head ... rolling machine,tapping drilling machineTesting:roughness test,hardness test, tensile testUsage:match with liner board ,widely applied in mining ,cement ... and electronic industryUNC/UNF available,we support OEM serviceTo compliment this extensive range of liner ...