Value Collection -40881-3 Button Socket Cap Screw

Product Description

The VALUE COLLECTION -40881-3 is a button socket cap screw designed for secure, low-profile fastening in mechanical assemblies, fixtures, and equipment. It features a 5/16-18 UNC thread with a 1-1/2 inch length under head and is fully threaded for maximum thread engagement. The alloy steel construction with a black oxide finish delivers corrosion resistance and durability in demanding service environments. A 3/16 inch hex socket drive provides reliable torque transfer during installation. This fastener is suited for use by machinists, maintenance technicians, and mechanical contractors working on industrial and commercial equipment.

This screw is commonly used in applications where a flush or recessed fastener head is required to avoid interference with adjacent components. Typical uses include machine guards, fixture plates, enclosures, brackets, and structural assemblies where a standard hex head fastener would protrude. The button head profile distributes clamp load over a wider bearing surface compared to a flat or socket head cap screw. It is available in a minimum order quantity of 50 pieces per order, packaged as a single unit.

Key Features

• 5/16-18 UNC fully threaded alloy steel construction for high-strength fastening
• Black oxide finish provides corrosion resistance and reduces light reflection
• Button head profile offers low-profile clearance and wider bearing surface
• 3/16 inch hex socket drive for use with standard hex keys and socket tooling
• Hardness rated 36-43 HRC for reliable performance in high-load applications
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard UNC button socket cap screw replacement for mechanical assemblies requiring a 5/16-18 thread, 1-1/2 inch length under head, and a hex socket drive interface.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/16 inch hex key or T-handle driver. Verify thread fit class 3A compatibility with the mating threaded insert or tapped hole before installation. Apply appropriate thread lubricant or thread-locking compound as required by the application. Do not exceed the rated torque range for the fastener diameter and material grade.