Value Collection D39406 Hex Head Cap Screw 1/2-20

Product Description

The VALUE COLLECTION D39406 is a fully threaded hex head cap screw sized 1/2-20 x 1-1/2 inches, manufactured from Grade 8 steel with a zinc yellow dichromate finish. Grade 8 is a high-strength fastener classification, suitable for high-load mechanical and structural applications. The zinc yellow dichromate coating provides corrosion resistance while meeting common finish specifications for industrial and trade use. This fastener conforms to ASME B18.2.1 and SAE J429 standards, making it appropriate for applications where dimensional and mechanical property verification is required. Installers in HVAC, mechanical, and general trade work will find this screw a reliable choice for bolted assemblies requiring a fine-thread UNF profile.

This hex head cap screw is suited for use in residential and commercial mechanical assemblies where a 1/2-20 UNF fine thread pattern is specified. Fine threads provide better torque control and are commonly used in applications involving vibration or where precise clamping load is needed. The fully threaded body maximizes thread engagement across the full 1-1/2 inch length under the head. Typical applications include equipment mounting, bracket fastening, and structural bolted connections in HVAC, plumbing, and general mechanical work.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/2-20 UNF fully threaded profile for maximum thread engagement
• Zinc yellow dichromate finish provides corrosion resistance
• Conforms to ASME B18.2.1 and SAE J429 standards
• Length under head of 1-1/2 inches suits a wide range of bolted assemblies

Compatibility

Designed as a standard 1/2-20 UNF hex head cap screw for use in any application requiring a Grade 8 fully threaded fastener with inch-measurement dimensions per ASME B18.2.1.

Installation Notes

Installation is performed by mechanical, HVAC, or general trade technicians using standard hex wrenches or sockets. Always verify that the mating threaded hole or nut matches the 1/2-20 UNF thread specification before installation. Ensure mating surfaces are clean and free of debris to achieve proper seating and clamping load. Follow applicable mechanical codes and equipment manufacturer torque guidance when tightening Grade 8 fasteners in structural or load-bearing assemblies.