Grade 8 Steel Plain Hex Head Cap Screws
Product Detailed Description
5/16-18 x 5/8" 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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