5/16 Heavy Duty Drill Bit - Stubby Length

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

1/4-20 x 1 3/4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100)

1-8 x 3 1/2 Socket Cap Screw Alloy

3/4-10 x 4 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (20)

7/8-9 x 1 1/4 x 2 1/2 A563 Grade A Hex Coupling Nut ZInc Plated 7/16-20 Hex Cap Screws 18-8 Stainless Steel 5/16 Heavy Duty Drill Bit7 8 9 x 1 1 4 x 2 1 2 A563 Grade A Hex Coupling Nut ZInc Plated . A double chamfered hex nut used to join to externally threaded parts of equal diameter and pitch, often two pieces of threaded rod. Manufactured from 1010 1018 equivalent steel. Hardness = Rockwell B68 C32 Tensile strength = 60,000 psi. minimum. Note there is no single standard for coupling nut dimensions. These values are offered as a guide; deviations from these specifications may