These are partially threaded hex cap screws with all dimensions conforming to DIN 931

5/16-18 x 2 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (600)

low temperature powdered product developed to impart a black conversion coating of zinc die casting

3/8-24 x 7/8 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (1000)

3/8-16 x 2 3/4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100) 1/2 Cotter Pins Plain Steel These are partially threaded hex3 8 16 x 2 3 4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100) . Grade 5 Hex Cap Screws are manufactured in the USA from medium carbon steel. Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications. All products are manufactured with rolled threads. Typical hardness on diameters 1 4 to 1 inch is HRC 25 34. On diameters over 1 inch to 1 1 2 hardness will range from HRC 19 30. Tensile strength for diameters 1 4 to 1 inch is a minimum