Armor Coat UST235933 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The ARMOR COAT UST235933 is a hex socket cap screw designed for demanding fastening applications in mechanical, HVAC, plumbing, and industrial assembly work. It features a 1/4-20 UNC thread size, a 3-3/4 inch length under head, and a 3/16 inch hex drive. The fastener is machined from alloy steel and finished with an Armor Coat coating for corrosion resistance. It is partially threaded, following the ASME B18.3 standard, making it well suited for applications requiring a bearing surface on the unthreaded shank. Trade professionals install these where high-strength, recessed-drive fasteners are required in tight clearance conditions.

This screw is used in commercial and residential mechanical assemblies, equipment mounting, and structural fastening where a socket head cap screw profile is specified. The 1/4-20 UNC thread is one of the most common unified coarse thread sizes found in HVAC equipment frames, pump housings, compressor mounts, and general mechanical enclosures. The Armor Coat finish adds durability in environments with moisture exposure or chemical contact. Sold individually with a minimum order quantity of 5 pieces per order.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped holes
• 3-3/4 inch length under head provides generous grip range for thick material stacks
• 3/16 inch hex drive size for use with standard Allen or hex key sets
• Partially threaded shank per ASME B18.3 for precise clamping and shank-bearing loads
• Alloy steel construction delivers high tensile and shear strength
• Armor Coat finish for corrosion and wear resistance in harsh service environments

Compatibility

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

Installation Notes

Install using a 3/16 inch hex key or Allen driver; use a torque-limiting driver where specified by the equipment manufacturer. Ensure mating threads are clean and free of debris before installation. This fastener is typically installed by mechanical contractors, HVAC technicians, or maintenance professionals following applicable equipment service documentation. De-energize and lock out all equipment before performing any fastener installation or removal on live mechanical systems.