Armor Coat UST235921 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The ARMOR COAT UST235921 is a hex socket cap screw designed for secure, high-torque fastening in mechanical, industrial, and trade applications. It features a 1/4-20 UNC thread size and measures 7/8 inches in length under the head, with full threading along the shank. The screw is driven by a 3/16-inch hex key and is manufactured from alloy steel with an Armor Coat finish for corrosion resistance. It conforms to ASME B18.3 standards, making it suitable for applications requiring dimensional consistency and reliable clamp load. Licensed tradespeople and maintenance technicians install this fastener in equipment assemblies, brackets, and structural connections where a recessed hex drive is specified.

This screw is used across a wide range of mechanical and trade installations, including HVAC equipment mounting, plumbing fixture brackets, electrical enclosure hardware, and general equipment assembly. Its fully threaded shank allows maximum thread engagement in both through-hole and tapped applications. The Armor Coat finish provides enhanced resistance to moisture and mild corrosive environments, making it appropriate for both indoor mechanical rooms and moderate outdoor exposure scenarios.

Key Features

• 1/4-20 UNC thread size for common tapped hole compatibility
• 7/8-inch length under head, fully threaded for maximum thread engagement
• 3/16-inch hex socket drive for recessed, torque-controlled installation
• Alloy steel construction for high tensile strength
• Armor Coat finish for corrosion resistance
• Meets ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 1/4-20 UNC fully threaded fastener with a 3/16-inch hex drive.

Installation Notes

Install using a 3/16-inch hex key or socket driver; use of a torque wrench is recommended where a specified clamp load is required by the equipment manufacturer. Ensure the mating tapped hole or nut meets 1/4-20 UNC thread specifications before installation. De-energize and isolate any equipment before fastener work on live assemblies. Follow applicable mechanical codes and equipment service documentation for fastener replacement procedures.