... ,hexagonal nut,heavy nut,flange nut,butterfly nut,wing nut;full thread,all-thread,double end head thread,double thread rod ... ;flat washer,plain washer,spring washer.3).Steel Grades: Stainless Steel 304, 304L, 316, 316L, 321, 317L,904L Super duplex ... stainless steel F55, F51, HastelloyB&C, Inconel, Incoloy etc. 4).Standards: GB , ...