Value Collection 015191PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 015191PR is a hex socket cap screw designed for applications requiring a clean, low-profile fastener with high tensile strength. It features a 1/4-28 UNF thread size and a 2.25-inch length under the head, making it suitable for medium-depth fastening in precision assemblies. The 3/16-inch hex drive accepts a standard Allen key or hex bit driver. Constructed from alloy steel with a black oxide finish, this fastener resists corrosion in controlled environments and meets ASME/ANSI B18.3, ASTM A574, and IFI 124 standards. Partially threaded along the shank, it provides a smooth bearing surface for close-tolerance fits.

This cap screw is used across a broad range of mechanical, industrial, and equipment-maintenance applications. It is appropriate for machine assembly, equipment enclosures, brackets, and similar structural connections where a recessed hex drive is preferred over a hex head. The 1/4-28 UNF fine thread pitch provides tighter thread engagement, making it a common choice in metalworking, HVAC equipment frames, electrical enclosures, and light industrial machinery. Installers working in tight clearances will benefit from the socket drive, which allows torque application with minimal surrounding clearance.

Key Features

• 1/4-28 UNF fine thread for tighter thread engagement and vibration resistance
• 2.25-inch length under head suits medium-depth fastening applications
• 3/16-inch hex socket drive compatible with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 high-strength cap screw requirements
• Black oxide finish provides mild corrosion resistance in indoor and controlled environments
• Partially threaded shank offers a smooth bearing surface for close-tolerance assemblies

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw compatible with any 1/4-28 UNF tapped hole requiring a 3/16-inch hex drive fastener.

Installation Notes

Install using a 3/16-inch hex key or hex bit driver; ensure the tapped receiving hole is clean and free of debris before threading. Power down or de-energize any equipment before accessing fastener locations on live electrical or mechanical assemblies. Do not exceed the rated proof load for the 1/4-28 UNF alloy steel grade; follow applicable equipment manufacturer torque guidelines. Black oxide finish is not a substitute for plated or stainless fasteners in wet or high-humidity environments.