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

Product Description

The Value Collection -40878-4 is a button socket cap screw designed for fastening applications that require a low-profile head and internal hex drive. It features a 1/4-20 UNC thread at 1-1/2 inches in length under the head, manufactured from alloy steel with a black oxide coating for corrosion resistance and reduced light reflection. The head height measures 0.132 inches, and the drive accepts a 5/32 hex key. Hardness is rated at 36-43 HRC, making this screw suitable for moderate-to-high strength clamping requirements. Licensed trade professionals and maintenance mechanics will find this screw appropriate for machine assembly, panel mounting, and similar structural fastening tasks.

This button socket cap screw is suited for general industrial and mechanical assembly applications where a flush or near-flush head profile is required. The black oxide finish makes it a common choice in applications where glare reduction or a dark aesthetic finish is preferred alongside moderate corrosion resistance. It is partially threaded and carries a Thread Fit Class of 3A, indicating a standard clearance fit compatible with typical tapped holes and hex nuts in light to medium structural assemblies. Minimum order quantity is 50 pieces.

Key Features

• Button head profile provides low clearance and smooth, rounded appearance after installation
• 5/32 hex socket drive for use with standard Allen or hex key tooling
• Alloy steel construction rated at 36-43 HRC hardness for reliable clamping strength
• Black oxide coating reduces surface corrosion and minimizes light reflection
• Partially threaded shank per ANSI/ASME B18.3 and ASTM F835 standards
• Right-hand thread direction, UNC Thread Fit Class 3A

Compatibility

Designed as an OEM-style replacement or general-use button socket cap screw for mechanical assemblies requiring a 1/4-20 UNC thread and a 5/32 hex socket drive in a low-profile button head configuration.

Installation Notes

Install using a 5/32 hex key or Allen driver; ensure the mating tapped hole is clean and free of debris before threading. Power down or de-energize any equipment before accessing fastened panels or housings. Do not exceed the rated thread engagement depth for the mating material. Follow applicable mechanical codes and torque guidelines established by the equipment manufacturer or governing assembly standard.