The standard can be DIN931, DIN933, DIN6915, DIN7991, DIN7990, etc, the material can be alloy steel and carbon steel
NINGBO ZHENHAI JILIAN FASTENER PIECES CO., LTD, one of the leading manufactures in the line of fasteners in China. We can produce standard hexagonal nuts, square nuts, special nuts and the relevant....
The standard can be ASTMA194, DIN934, DIN6915, etc. The material can be carbon steel and alloy steel