It's manufactured with hardened steel

5/8-11 x 5 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25)

3/4-10 x 8 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (30)

2-4 1/2 x 4 Socket Cap Screw Alloy

1/2-13 x 4 1/4 Hex Cap Screw SS 316 (A4)

1/2-13 x 3 A325 Type 1 Heavy Hex Bolt Plain Domestic (USA) - Bulk Keg (950) 5/8-11 A307A Hex Bolts Zinc Plated It's manufactured with hardened steelThis pack of 1 2 13 x 3 A325 Type 1 Heavy Hex Bolts is perfect for heavy duty construction projects. Made in the USA and guaranteed to meet the ASTM A325 Type 1 standards for quality, strength, and performance. Conveniently packaged in a bulk keg of 950 pieces for a reliable supply.