[100 PKG] Hex Head Cap Screws Grade 5 Steel Plain (USA Made) 5/16-18 x 1 1/8

Hex Head Cap Screws Grade 5 Steel Plain (USA Made) 5/16-18 x 1 1/8 are high-strength fasteners designed for dependable performance across automotive, machinery, and construction applications. Crafted in the USA from Grade 5 steel with a plain, uncoated finish, these screws deliver solid strength and straightforward installation for a wide range of projects.

With a 5/16-inch diameter, 18 threads per inch (UNC) coarse thread, and a length of 1 1/8 inches, these hex head cap screws are made to fit standard nuts and tapped holes. The hex head provides ample torque for secure, hands-on tightening, while the plain finish allows easy painting or coating to suit your project needs.

Product Details

• Type: Hex Head Cap Screw
• Material: Grade 5 Steel
• Finish: Plain (uncoated)
• Diameter & Pitch: 5/16″ diameter, 18 TPI (UNC)
• Length: 1 1/8″
• Head Drive: Hex Head
• Thread Type: Coarse
• Made In: USA

Applications

Ideal for heavy-duty assemblies where strong clamping and reliable retention are required. Commonly used in machinery, equipment mounting, automotive applications, and structural fastenings where standard 5/16-18 UNC hardware is specified.

These screws pair with standard nuts and tapped holes, offering dependable performance in a plain finish that can be painted or coated to match your design or environment.