Each washer is made from thru-hardened medium carbon steel

7/8-9 x 2 3/4 Socket Head Cap Screws Thermal Black Oxide Alloy Steel Domestic USA - Bulk (80) Socket Cap Screws with Thermal Black Oxide finish are made in the USA from durable alloy steel for superior strength and reliability

1-8 x 14 A307A Hex Bolt Zinc Plated

1/2-20 x 7 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (90)

3/8-16 x 1 1/4 Socket Head Cap Screws Thermal Black Oxide Alloy Steel Domestic USA - Bulk (1000) 7/16-14 Socket Cap Screws Thermal Black Oxide Alloy Domestic USA Each washer is made from3 8 16 x 1 1 4 Socket Head Cap Screws Thermal Black Oxide Alloy Steel Domestic USA Bulk (1000) Socket Cap Screws with Thermal Black Oxide finish are made in the USA from durable alloy steel for superior strength and reliability. Featuring a hex drive and corrosion resistant coating, ideal for high performance and structural applications.