Dorman 803-420BX Grade 5 Hex Head Cap Screw 1/2-13 x 2 In. Zinc-Plated

The Dorman 803-420BX is a Grade 5 hex head cap screw with a 1/2"-13 UNC thread and 2-inch length, finished in zinc plating for corrosion resistance. Designed for general automotive, industrial, and mechanical fastening applications, this bolt meets SAE Grade 5 strength standards, making it suitable for medium-strength clamping and assembly work.

Key Specifications:

• Thread Size: 1/2"-13 UNC (Unified National Coarse)
• Length: 2 inches
• Grade: SAE Grade 5 (medium-carbon steel, quenched and tempered)
• Head Style: Hex head (requires standard 3/4" wrench or socket)
• Finish: Zinc plating for rust and corrosion resistance
• Standard: SAE / UNC thread specification
• Proof Load Strength: 85,000 PSI (Grade 5)
• Tensile Strength: 120,000 PSI minimum (Grade 5)

Grade 5 hex head cap screws are identified by three radial lines on the bolt head and are among the most widely used fasteners in automotive and light industrial assembly. The zinc-plated finish provides a protective barrier against oxidation, extending service life in under-hood and outdoor environments. Sold as a bulk box (BX) pack, the Dorman 803-420BX is a convenient supply solution for shops, fleets, and DIY technicians needing reliable, standardized hardware on hand.