... :M20-M30-M40-M50(50mm-1500mm) According to customers' Drawing and samplesLiner boltsNon-standard fasteners1) Materials:Carbon steel,stainless steel,brass ... ) Grade:4.8-12.94) Standards:DIN,ISO,UNC.BSW and unstandard etc.5) Packing:paper bag,wooden case,pallet etc ... and American standard etc.8) Grade:4.8,6.8,8,8.8 etc.9) Size: According to customers' requirements Special ball mill and ...