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

5/8-11 x 5 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (70)

#39 Heavy Duty Drill Bit - Stubby Length

7/8-14 x 3 Socket Set Screw Cup Point Alloy

3/8-16 x 5/8 Grade 8 Hex Cap Screw Plain Domestic USA (1200)

1 1/8-7 x 2 3/4 A325 Type 1 Heavy Hex Bolt Plain Domestic (USA) - Bulk Keg (170) 18" Aircraft Bits - Fractional On diameters over 1 inchThis high quality A325 Type 1 Heavy Hex Bolt meets ASTM and SAE international standards. Its dimensions are 1 1 8 7 x 2 3 4 and comes with 170 pieces in a bulk keg. Its plain finish and superior material quality makes it highly durable and reliable.