Material: Carbon Steel Type: Square Head Connection: Common Bolt Head Style: Square Standard: DIN, ANSI, BSW Grade: 4.8 HS Code 7318160000 Product Description Square NUTS 1. Standard Code: DIN562 DIN557 2. Material: C1010 C1035 10B21 40Cr 3. Grade: From Grade 4.8-10.9 4. Sizes: From M3 to M12 5. Surface: phosphating black oxide chrome zinc . 6.manufacturing processes : cold forging 1 Gross Packing 1/4 3/16 5/32 1/8 ShengLingYing Fasteners Co., LTD Add：Jincheng Industrial Qianshan Town, Haiyan County Jiaxing city Zhejiang,China Tel: 00-86-20-8769 4686 Fax:00-86-20-8760 8044 Mobile phone 008613609729144 Wechat : 008613609729144 Whatsapp 0086 13609729144 Skype :slingying QQ: 1583454278 Emai: shenglingying@126.com