2012 precise short steel machining/processing pin bolt 1.steel,stainless steel,etc 2.round,straight,short,etc 3.plating,gloss 2012 precise short steel machining/processing pin boltMaterial: 20# / 45# steel (or on your demand)Minimum Tolerance: ±0.005mmProcessing Technics: CNC, tap, punch, cold heading Finish: Blackening processingThread length: as to customer's designCertification: ISO9001: ...