Hex Head Cap Screws Grade 8 Steel Plain (USA Made) 5/8-18 x 5-1/2 are a premium industrial fastener designed for extreme strength and reliability. Crafted from Grade 8 steel, these screws deliver high tensile strength and robust performance in demanding equipment and construction applications. The plain (uncoated) finish keeps threads clean and reduces the chance of interference with coatings or seals, while the hex head provides maximum grip for fast installation and removal.

Designed and manufactured in the United States, these screws are a trusted choice for professionals who require durable fasteners with consistent quality. Ideal for automotive, agricultural, machinery, and structural projects where a 5/8-18 thread and 5-1/2 inch length are specified.

Key Features

• Material: Grade 8 steel for exceptional strength and wear resistance
• Finish: Plain (uncoated) for compatibility with varied environments
• Head Style: Hex head cap screw for easy driving with a standard wrench or socket
• Thread: 5/8-18
• Length: 5-1/2 inches
• Size: 5/8-18
• Origin: USA made

Specifications

• Diameter: 5/8 inches
• Thread: 5/8-18
• Length: 5-1/2 inches
• Finish: Plain (unplated)
• Head type: Hex
• Material grade: Grade 8 Steel
• Origin: USA Made

For reliable, heavy-duty fastening, these Grade 8 hex screws are a solid choice that combines strength, US manufacturing quality, and a straightforward plain finish that works across diverse applications.