[400 BULK] Flange Bolts Serrated Hex Washer Case Hardened Zinc 3/8-16 X 2 1/4 Fast Shipping

Flange Bolts Serrated Hex Washer Case Hardened Zinc 3/8-16 X 2 1/4 offer secure fastening for automotive, machinery, and construction projects. These bolts combine a flange head with a serrated hex washer to distribute load and resist loosening, making them ideal for vibration-prone environments.

Crafted from high-strength steel and finished with zinc plating, they deliver durability and corrosion resistance in challenging conditions. The case-hardened treatment enhances wear resistance and long-term performance.

Size and thread: 3/8-16

Length: 2 1/4 in (2.25 in)

Head style: Flange with serrated hex washer

Finish: Zinc-coated, case-hardened

Material: Steel

Ideal for: Automotive, equipment, and machinery assemblies

Choose these flange bolts for reliable clamping, reduced loosening, and strong performance in both indoor and outdoor environments. They are sized to fit standard 3/8-16 threaded holes and can be used across a wide range of applications requiring a flush, high-shear connection.