Description
Hex Head Cap Screws Grade 8 Steel Plain (USA Made) 5/16-18 x 5 1/2. Built for high-strength fastening in demanding machinery, automotive, and industrial applications, these screws deliver dependable durability and a secure, heavy-duty hold.
Product Highlights
- Material: Grade 8 steel for exceptional tensile strength and long-lasting performance.
- Finish: Plain (uncoated) steel — unmatchable strength with no plating. Ideal for indoor use or applications where plating isn’t required.
- Head Type: Hex Head for easy driving with standard wrenches or sockets.
- Thread/Size: 5/16-18 UNC — coarse thread for strong, quick assembly.
- Length: 5 1/2 inches overall, providing substantial engagement in thick parts.
- Country of Origin: USA Made — quality you can trust from domestic manufacturing.
Specifications
- Diameter: 5/16 inch
- Thread pitch: 18 per inch (UNC)
- Length: 5-1/2 inches
- Material: Grade 8 steel
- Finish: Plain (uncoated)
- Head style: Hex
Applications
Designed for high-load fastening in machinery, equipment mounting, automotive assemblies, and structural hardware where maximum strength is required. The plain finish makes these screws ideal for clean metal-to-metal joints in controlled environments.
Installation & Care
- Use a standard hex drive (hex wrench or socket) to achieve the recommended torque without damaging the hex head.
- Apply appropriate lubrication or threadlocker as needed to prevent loosening.
- Store in a dry environment to minimize corrosion risk with plain steel.
Can We Help?
If you’re not sure that this product is right for you, give us a call!
800-222-0324