Made from medium carbon steel. You will notice that it's hexagon head surface is smooth with no markings
Tensile Strength: 120,000 psi 1/4 thru 1 inch diams, all lengths) - 105,000 psi. (1-1/8 thru 1.5 inch diams, all lengths)
Description
Ecom Fasteners 5/16 inch x 1-1/4 inch Hex Cap Screw Grade 5 Zinc Plated Steel (Quantity: 100 pcs) 5/16-24 x 1 1/4 Hex Bolt / Fine Thread / Fully Threaded