standard nut standard:DIN 934,936,555,6915,6923,IFID-6,D-8, ... 18.2.2,UNI5587,5588. 1)different types of standard nut2)standard:DIN 934,936,555,439,6915,6923,JIS,B1181 UNI5587 ... ,1768,1769 GB/T41-2000,GB805-88,GB806-88 and so on. 3)class: 4,6,8,104)surface:plain, black ... ,alloy steel,carbon steel6)package:bulk packing,small boxes,pocket. standard fastener nut