[300 BULK] Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 X 4

Our Flange Bolts Serrated Hex Washer Case Hardened Zinc 5/16-18 X 4 deliver a durable, secure fastening solution for a wide range of applications. Built for strength and reliability, these bolts combine a low-profile flange head with a serrated hex washer to provide even load distribution and anti-slip performance in challenging environments.

Key specifications

• Size: 5/16 in diameter, 18 threads per inch, length 4 inches
• Head and washer: Flange head with integrated serrated hex washer for a strong grip and vibration resistance
• Material and finish: Steel core with case hardened treatment and zinc plating for enhanced strength and corrosion resistance
• Durability: Case hardened for improved wear resistance, making them suitable for high-stress fastenings
• Vibration performance: Serrated washer helps prevent loosening under dynamic loads

Ideal for automotive, machinery, and construction projects where a secure, high-strength fastener is required. The combination of a flange head, serrated washer, and zinc finish provides dependable performance in exposed and demanding environments.