Grade-8 Hex Cap Screw
Mechanical and Performance Data

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 tmpered at a minimum tempering temperature of 800 F.
Material Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 in. 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)
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*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
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