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Grade 8 Steel Plain Hex Head Cap Screws

Product Detailed Description

3/8-16 x 6" Long Grade 8 Steel Plain Hex Head Cap Screws

  • Description: A cap screw made from medium carbon alloy steel and heat-treated. 
  • Applications/Advantages: Has greater tensile strength than a Grade-5. Designed for use in high stress applications. See specifications below for more information on how the Grade-8 exceeds the strength of a Grade-5.
  • Heat Treatment: Grade-8 cap screws shall be heat-treated, oil-quenched and tempered at a minimum temperature of 800°F. 
  • Material: Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 inch, it is permissible to use AISI 1541 steel. 
  • Core Hardness: 1/4 through 1-1/2 in. diameter, all lengths: Rockwell C33 - C39. 
  • Surface Hardness: 1/4 through 1-1/2 in. diameter, all lengths: Rockwell 30N58.6 maximum. 
  • Proof Load: 1/4 through 1-1/2 in. diameter, all lengths: 120,000 psi. 
  • Yield Strength*: 1/4 through 1-1/2 in. diameter, all lengths: 130,000 psi. minimum 
  • Tensile Strength: 1/4 through 1-1/2 in. diameter, all lengths: 150,000 psi. minimum  
  • Elongation*: 12% minimum (all diameters) 
  • Reduction of Area*: 35% minimum (all sizes)
  • Manufactured to ASME B18.2.1 and SAE J429 specifcations
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all cap screws 1/4” diameter and larger. “X” represents one location such a marking may appear


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