Value Collection 40874 Button Socket Cap Screw 1/4-20 X 3/8

Product Description

The VALUE COLLECTION 40874 is a button socket cap screw designed for applications requiring a low-profile fastening solution with high tensile strength. Sized at 1/4-20 UNC thread by 3/8 inch length under the head, this screw is fully threaded and driven with a 5/32 inch hex socket key. Manufactured from alloy steel with a black oxide finish, it delivers corrosion resistance and a clean, dark appearance. Hardness is rated at 36-43 HRC, meeting ANSI/ASME B18.3 and ASTM F835 standards. Machinists, maintenance technicians, and fabricators install this fastener across a wide range of mechanical assemblies.

This button socket cap screw is suited for use in tight-clearance assemblies where a standard hex cap screw head would interfere with adjacent components. The low-dome button head distributes clamping load over a wider bearing surface than a flat-head style. Common applications include machine guards, fixture plates, enclosure panels, and general mechanical assemblies in industrial, commercial, and light manufacturing environments. The black oxide coating is appropriate for interior or protected exterior installations where moderate corrosion resistance is acceptable.

Key Features

• 1/4-20 UNC fully threaded, 3/8 inch length under head for shallow-depth installations
• Button head profile provides low-clearance fastening with wide bearing surface
• 5/32 inch hex socket drive for standard Allen key or hex bit driver
• Alloy steel construction with 36-43 HRC hardness for high-load applications
• Black oxide coating adds mild corrosion resistance and reduces light reflection
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 1/4-20 UNC button socket cap screw conforming to ANSI/ASME B18.3 and ASTM F835, suitable as a direct replacement or new installation fastener in any assembly requiring this thread size and head style.

Installation Notes

Install with a 5/32 inch hex key or socket bit driver; do not substitute an incorrect key size as it may strip the socket. Ensure the receiving thread is clean and free of debris before installation. Black oxide fasteners are not intended for prolonged outdoor or high-humidity exposure without additional corrosion protection such as oil or wax. Follow applicable machinery and equipment manufacturer torque guidelines for 1/4-20 fasteners in the specific joint material being used.