#59 Heavy Duty Drill Bit - Stubby Length

3/8-24 x 2 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (450)

and the jaws open to a lock position when the screw is inserted

On diameters over 1 inch to 1 1/2 hardness will range from HRC 19-30

3/8-16 x 1 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (675)

5/16-18 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (1400) 3/4-16 Hex Cap Screws 316 Stainless Steel #59 Heavy Duty Drill Bit5 16 18 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (1400) . 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