Armor Coat UST235945 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The ARMOR COAT UST235945 is a hex socket cap screw designed for high-strength bolted connections in mechanical, industrial, and trade applications. Manufactured from alloy steel with an Armor Coat finish for corrosion resistance, this fastener features a 5/16-18 UNC thread and a 1/4-inch hex drive for use with standard hex keys or Allen-type drivers. The partially threaded shank provides a positive bearing surface under the head, making it well suited for clamping applications where a smooth shank section is needed. It conforms to ASME B18.3 standards, confirming dimensional accuracy and mechanical performance. Licensed tradespeople and maintenance professionals specify this type of fastener in structural, equipment, and panel assembly work.

This screw is applicable across a wide range of trade and industrial settings including HVAC equipment assembly, electrical enclosure mounting, plumbing fixture support brackets, and general mechanical equipment maintenance. The Armor Coat finish improves resistance to oxidation and mild chemical exposure, making it appropriate for both indoor and moderate outdoor service environments. Each unit is sold individually, with a minimum order quantity of 10 pieces per order.

Key Features

• 5/16-18 UNC thread form for compatibility with standard inch-series tapped holes
• 2.25-inch length under head with partial threading for clamped joint applications
• Alloy steel construction for high tensile and shear strength
• Armor Coat finish provides corrosion protection over bare steel
• 1/4-inch hex drive accepts standard hex keys and socket drivers
• Conforms to ASME B18.3 dimensional standard

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/16-18 UNC partially threaded fastener with a 1/4-inch hex drive.

Installation Notes

Installation is performed using a 1/4-inch hex key or Allen-type driver; verify the drive tool is fully seated before applying torque to avoid rounding the socket. Ensure the mating tapped hole or nut is clean and free of debris before threading. Always de-energize and isolate any equipment before fastener work on electrical or mechanical assemblies. Follow the applicable equipment manufacturer torque specification for the joint being assembled.