Bolts > Hex Head Grade 8


Description

A cap screw made from medium carbon steel and heat-treated.
Applications/Advantages: Has greater tensile strength than a Grade-2. Yield-to-tensile ratio is the lowest of all heat treated steels.
Heat Treatment: Grade-8 cap screws shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum tempering temperature of 800°F.
Material: Medium carbon steel. Use of an alloy steel is also acceptable.
Core Hardness: 1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34. 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30.
Surface Hardness: 1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum. 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum.
Proof Load: 1/4 through 1 in. diameter, all lengths: 85,000 psi. 1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi.
Yield Strength*: 1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum 1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum.
Tensile Strength: 1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum 1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum.
Elongation*: 14% minimum (all diameters).
Reduction of Area*: 35% minimum (all sizes).

Sizes

  • 1/4-20 x 3/4
  • 1/4-20 x 1
  • 1/4-20 x 1-1/4
  • 1/4-20 x 1-1/2
  • 1/4-20 x 2
  • 5/16-18 x 3/4
  • 5/16-18 x 1
  • 5/16-18 x 1-1/4
  • 5/16-18 x 1-1/2
  • 5/16-18 x 2
  • 3/8-16 x 1
  • 3/8-16 x 1-1/4
  • 3/8-16 x 1-1/2
  • 3/8-16 x 2
  • 3/8-16 x 2-1/2
  • 1/2-13 x 1
  • 1/2-13 x 1-1/4
  • 1/2-13 x 1-1/2
  • 1/2-13 x 2
  • 1/2-13 x 2-1/2