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

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5/16-24 x 1 1/4 Grade 5 Hex Cap Screw Plain Domestic USA (1100) M12-1.75 Hex Cap Screws 8.8 DIN 931 Zinc Plated These are partially threaded hex5 16 24 x 1 1 4 Grade 5 Hex Cap Screw Plain Domestic USA (1100). 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 of