[50 PKG] Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/8-11 X 3 1/2

Secure, strong, and built for vibration-prone assemblies, the Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/8-11 X 3 1/2 combines superior load distribution with rugged durability. Designed for metal-to-metal fastening, these bolts deliver reliable performance in demanding environments.

Product snapshot

Size and thread: 5/8 in diameter with 11 threads per inch (5/8-11 UNC).

Length: 3-1/2 in grip length.

Head and washer: Hex flange head with integrated serrated washer for added grip and anti-rotation protection.

Finish and material: Case-hardened steel core with a zinc electroplated finish for corrosion resistance.

Drive type: Standard hex drive for easy installation with common tools.

Why choose these bolts?

Flange design distributes clamping load over a larger area, reducing the risk of damage to lightweight panels and thin materials.

Serrated washer helps prevent loosening by biting into the mating surface, even in high-vibration applications.

Case hardened steel offers increased toughness and wear resistance, ideal for machinery, automotive assemblies, and heavy equipment.

Zinc plating provides corrosion resistance in indoor and outdoor settings, extending service life.

Ideal applications

Perfect for automotive assemblies, machinery, equipment, construction projects, HVAC installations, sheet metal work, agricultural gear, and other situations requiring secure, long-lasting fastenings with standard 5/8-11 threads.

Specifications

Diameter: 5/8 in

Thread: 5/8-11 UNC

Length: 3-1/2 in

Material: Steel (case hardened)

Finish: Zinc

Head style: Hex flange with serrated washer

Drive: Hex