1. Standard: DIN,ANSI,GB, ISO,etc 
2. Size: M6-M36, 1/4--2
3.Material: Carbon Steel ,Lowcarbon steel, middle carbon steel, alloy steel, stainless steel 304, 316, 201
4.Class: 4.8 6.8 8.8 10.9 12.9
5.Surface: Zinc plated(yellow, black,), black oxide chrome plated, Cr+3, Cr+6,hot dip galvanized
6.Packing:
1) Bulk packing: about 20-25kgs per carton. load cartons in pallets
2) Assortment in poly bag or plastic box..