[200 PKG] Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 X 5 Top Pick

Secure heavy-duty fastening with our Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 x 5. These high-strength bolts combine a built-in flange with a serrated hex washer for a clean, vibration-resistant fit in a wide range of applications.

Designed for durability, these bolts feature:

Key Features

Size & thread: 5/16 in diameter, 18 threads per inch (5/16-18), length 5 in

Material & finish: case-hardened steel with zinc plating for corrosion resistance

Flange & serrated washer: built-in flange distributes load; serrations bite into mating surfaces to resist loosening

Drive type: hex head for easy tightening with common tools

Applications: ideal for automotive, machinery, equipment, and construction fastenings that require a strong, reliable hold

Why choose case-hardened zinc flange bolts?

High strength-to-weight ratio to handle demanding environments

Excellent corrosion resistance thanks to zinc plating

Built-in washer reduces need for separate hardware and helps prevent pull-through

Serrated under-head surface improves vibration resistance

Specifications at a glance: Diameter: 5/16 in • Thread: 5/16-18 • Length: 5 in • Finish: Zinc-coated • Material: Case-hardened steel

Whether you’re outfitting a workshop project or performing maintenance on automotive or industrial equipment, these flange bolts provide dependable performance and a tidy fit. Add them to your hardware assortment for fast, secure assemblies that stand up to wear and tear.