Ningbo Steel Bolt Co.,Ltd 1. Standard: ASTM A193 2. Grade B7 and B7M and B16 and B8 and B8M 3. Type: Hexagon Head with Fine Thread 4. Heat Treatment: Yes 5. Surface Treatment: HDG, Black, ZINC, YZP, Plain, Dacromet 6. Material: Carbon Steel, Stainless Steel 7. Connection: Common Bolt Our commitments 1. High quality 2. Competitive price 3. The shortest delivery 4. The fastest response 5. Custom-design and Logo are welcomed
