Value Collection 872177PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 872177PR is a hex socket cap screw designed for precision fastening in applications requiring fine-thread engagement and reliable clamping force. Sized at 1/4-28 UNF with a 3/4-inch length under head, this fastener is fully threaded and driven by a 3/16-inch hex key. Constructed from alloy steel and finished with a zinc-plated coating for corrosion resistance, it meets ASME B18.8 and ASTM A574 standards. It is a standard choice for mechanical assemblies, brackets, and equipment panels where a low-profile socket head and fine-thread pitch are specified.

This screw is used across a wide range of trade and industrial applications, including HVAC equipment assemblies, electrical enclosures, plumbing fixture mounting, and general mechanical fabrication. The 1/4-28 UNF fine thread provides tighter thread engagement per inch compared to coarse-thread equivalents, making it well suited for thin-material fastening and applications where vibration resistance or precise torque control is important. It is typically installed by HVAC technicians, electricians, pipefitters, and general maintenance professionals.

Key Features

• 1/4-28 UNF fine-thread profile for tight engagement and vibration resistance
• Fully threaded 3/4-inch length under head for maximum thread contact
• 3/16-inch hex socket drive for use with standard hex keys or Allen-head drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Zinc-plated finish provides baseline corrosion protection in indoor environments
• Conforms to ASME B18.8 dimensional standards

Compatibility

Designed as a standard 1/4-28 UNF hex socket cap screw suitable for threaded holes or nuts conforming to ASME B18.8 and ASTM A574 specifications in mechanical, HVAC, electrical, and plumbing assemblies.

Installation Notes

Install using a 3/16-inch hex key or socket driver; ensure the mating threaded hole is clean and free of debris before driving. De-energize or shut down any equipment being serviced before fastener removal or installation. Follow applicable mechanical codes and equipment manufacturer torque guidelines for the specific assembly. Zinc-plated fasteners are intended for dry or mildly humid indoor environments and are not rated for sustained outdoor or corrosive exposure.