[400 BULK] Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 X 2 3/4 Trending

Durable flange bolts designed for high-strength, corrosion-resistant fastening, the Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 x 2-3/4 deliver reliable performance in automotive, machinery, and construction projects. The combination of a hex washer head and serrated flange provides a robust bearing surface and anti-slip performance under vibration.

Product Highlights

Material & Finish: Case-hardened steel with a durable zinc coating for corrosion resistance and extended service life.

Size & Threads: 5/16-18 thread pitch, standard coarse threads for quick, secure engagement.

Length: 2-3/4 inches overall length for strong clamping in thick panels or components.

Head & Drive: Hex washer flange head provides a large bearing surface and flush seating.

Grip & Vibration: Serrated flange minimizes loosening from vibration and reduces the need for lock washers.

Why Choose These Bolts

Designed to withstand demanding environments, these bolts combine strength, corrosion resistance, and secure seating. The integrated flange and serrations bite into surfaces to prevent rotation and pull-through, while the zinc finish protects against rust in indoor and outdoor installations.

Specifications

Finish: Zinc-coated

Material: Case-hardened steel

Size: 5/16-18

Length: 2-3/4 in

Head Type: Hex washer flange

Applications

Automotive assemblies

Industrial machinery

Construction and HVAC equipment

Equipment mounting and panel fastenings

Upgrade your hardware kit with these reliable flange bolts and enjoy steady, secure performance across a wide range of projects.