Value Collection 40878 Button Socket Cap Screw 1/4-20x1

Product Description

The VALUE COLLECTION 40878 is a button socket cap screw designed for fastening applications that require a low-profile head and a secure hex socket drive. Sized at 1/4-20 x 1 inch with a fully threaded shank, this screw is machined from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a matte black appearance. The 5/32-inch hex socket drive accepts a standard hex key for installation and removal. Hardness is rated at 36-43 HRC, meeting ANSI/ASME B18.3 and ASTM F835 standards. Licensed tradespeople and maintenance machinists use this fastener where a standard hex cap screw head would interfere with surrounding components.

This button socket cap screw is suited for machine assembly, tooling fixtures, guards, panels, and general mechanical fabrication where a flush or near-flush head profile is required. The UNC thread standard and 3A thread fit class make it compatible with standard tapped holes in ferrous and non-ferrous metal components. It is commonly used in industrial maintenance, automation equipment, and structural fabrication. The black oxide finish also reduces light reflection in optical or precision equipment enclosures.

Key Features

• Button head profile reduces interference with adjacent components and mating surfaces
• 5/32-inch hex socket drive for use with standard hex keys or ball-end drivers
• Alloy steel construction rated at 36-43 HRC hardness for high-stress fastening applications
• Black oxide finish provides mild corrosion resistance and low-reflectance appearance
• Fully threaded shank with UNC 1/4-20 thread and 3A fit class for accurate thread engagement
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or direct-use fastener for any application requiring a 1/4-20 UNC button socket cap screw per ANSI/ASME B18.3 specifications.

Installation Notes

Installation requires a 5/32-inch hex key or ball-end driver. Ensure the mating tapped hole is clean and free of debris before threading. Power down or de-energize any equipment before disassembling fastened assemblies on live machinery. Follow applicable torque guidance from the equipment manufacturer or applicable mechanical codes when determining final torque.