Value Collection -40878-3 Button Cap Screw 1/4-20 50pk

Product Description

The VALUE COLLECTION -40878-3 is a 1/4-20 button socket cap screw designed for industrial and mechanical fastening applications. The button head profile provides a low-profile, rounded top surface suited for assemblies where clearance is limited or a smooth exterior finish is required. The hex socket drive accepts a 5/32-inch hex key for installation and removal. At 1-1/4 inches in length under the head with partial threading and a UNC thread form, this screw is built for use with standard tapped holes or threaded inserts in metal and structural components. Alloy steel construction with a black oxide finish provides corrosion resistance and meets ANSI/ASME B18.3 and ASTM F835 standards.

This screw is used across a wide range of mechanical, HVAC equipment panel, electrical enclosure, and general industrial assembly applications. The UNC thread standard and 3A thread fit class make it compatible with the most common tapped hole specifications found in domestic equipment manufacturing and service. The black oxide finish is suitable for interior or protected exterior environments. Sold in a pack of 50, this item is appropriate for service technicians, maintenance crews, and assembly operations requiring consistent fastener stock.

Key Features

• 1/4-20 UNC thread with 3A fit class for precise thread engagement
• Button head profile provides low-profile clearance in tight assemblies
• 5/32-inch hex socket drive for standard hex key installation
• Alloy steel construction hardened to 36-43 HRC for high tensile strength
• Black oxide finish for corrosion resistance in protected environments
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or service stock fastener for any application requiring a 1/4-20 UNC button socket cap screw conforming to ANSI/ASME B18.3 and ASTM F835 specifications.

Installation Notes

Installation requires a 5/32-inch hex key or hex socket bit. Power down all equipment before replacing fasteners on live panels or enclosures. Ensure the receiving tapped hole is clean and free of debris before driving the screw to avoid cross-threading. Do not exceed the torque capacity appropriate for the thread size and material being fastened; refer to applicable ANSI or equipment manufacturer specifications for torque guidance.