Value Collection -40881-1 Button Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION -40881-1 is a 5/16-18 button socket cap screw designed for mechanical assemblies where a low-profile head and high clamping strength are required. Manufactured from alloy steel with a black oxide finish, this fastener delivers corrosion resistance and reduced light reflection in service environments. The 3/16-inch hex socket drive accepts standard hex keys and T-handle drivers. At 1-1/4 inches under the head and partially threaded, it suits applications where thread engagement length and head clearance are both design considerations. Hardness is rated at 36-43 HRC, meeting ANSI/ASME B18.3 and ASTM F835 standards.

This screw is used across a wide range of industrial and mechanical applications including machine guarding, fixtures, brackets, panel assemblies, and equipment housings where a flush or near-flush fastener profile is preferred over a standard hex cap screw. The button head style is common in sheet metal work, electronics enclosures, and light structural connections. Installation is performed by maintenance technicians, millwrights, and mechanical assemblers in both production and field service settings. The minimum order quantity is 50 pieces per order.

Key Features

• Button head profile provides low-profile clamping surface for clearance-sensitive assemblies
• Alloy steel construction with 36-43 HRC hardness for high tensile and shear strength
• Black oxide finish offers mild corrosion resistance and reduced surface reflectivity
• 3/16-inch hex socket drive compatible with standard hex keys and hex bit drivers
• Partially threaded shank on 1-1/4-inch length for controlled thread engagement
• Meets ANSI/ASME B18.3 and ASTM F835 standards; UNC thread form, Class 3A fit, right-hand thread

Compatibility

Designed as a standard 5/16-18 UNC button socket cap screw suitable for use in threaded holes or with appropriate nuts wherever ANSI/ASME B18.3 and ASTM F835 compliant fasteners are specified.

Installation Notes

Installation is performed using a 3/16-inch hex key or hex socket driver. Ensure the mating threaded hole or nut meets UNC 5/16-18 specifications and Class 3B or equivalent tolerance before installation. Follow applicable torque specifications from engineering documentation or fastener reference standards for alloy steel cap screws. Inspect threads for damage or contamination before assembly.