Product name: silo bolt Grade of silo bolt: 8.8, 10.9 Coating of silo ... of Silo bolt could be 1", 1-1/4", 2", 4",6"2, Grade of silo bolt:This could be 8.8 and ... and 12.9;3, Material of Silo boltAccording to the grade request, the material could 35K, 40Cr.4, Surface finish of ... ;5, Delivery time of Silo boltLike the size of 1/2"*1", we could finish 600000pcs per month. Silo bolt