Value Collection -40877-1 Button Socket Cap Screw 1/4-20

Product Description

The VALUE COLLECTION -40877-1 is a fully threaded button socket cap screw designed for fastening applications that require a low-profile head and reliable clamping strength. Sized at 1/4-20 UNC thread with a 7/8-inch length under the head, this fastener is driven by a 5/32-inch hex socket. It is manufactured from alloy steel and finished with black oxide coating for corrosion resistance and a consistent matte appearance. Head height measures 0.132 inches. Hardness is rated at 36-43 HRC, meeting ANSI/ASME B18.3 and ASTM F835 standards. This screw is suited for mechanical assemblies, fixtures, and equipment where a flush or recessed fastener profile is required.

This button socket cap screw fits a wide range of general industrial, mechanical, and fabrication applications. The low-profile domed button head is commonly used in panel assemblies, guards, brackets, and machine components where a standard hex cap head would protrude too far or interfere with adjacent parts. It is appropriate for both light industrial and commercial installations. The right-hand, class 3A thread fit ensures consistent engagement in standard tapped holes. Machinists, maintenance technicians, and fabricators typically install this type of fastener in both new builds and repair work.

Key Features

• 1/4-20 UNC fully threaded, 7/8-inch length under head
• Low-profile button head at 0.132 inches tall for clearance-sensitive assemblies
• 5/32-inch hex socket drive for standard hex key or socket wrench installation
• Alloy steel construction with 36-43 HRC hardness rating
• Black oxide finish for moderate corrosion resistance and reduced light reflection
• Meets ANSI/ASME B18.3 and ASTM F835 standards

Compatibility

Designed as a standard 1/4-20 UNC button socket cap screw for use in tapped holes or with compatible nuts in general mechanical and industrial assemblies.

Installation Notes

Install using a calibrated 5/32-inch hex key or hex socket bit. Ensure the mating tapped hole or nut is clean and free of debris before driving the fastener. Power down or de-energize any equipment before performing fastener installation or removal in electrical or mechanical enclosures. Follow applicable ASME or facility maintenance standards for fastener seating and inspection.