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

Product Description

The VALUE COLLECTION 40881 is a 5/16-18 button socket cap screw designed for use in fastening applications that require a low-profile head and high clamp load. The screw features a hex socket drive sized at 3/16 inch and a fully threaded shank measuring 1 inch under the head. Constructed from alloy steel with a black oxide finish, the fastener meets ANSI/ASME B18.3 and ASTM F835 dimensional and mechanical standards. Hardness is rated at 36-43 HRC, and the thread fit class is 3A with right-hand, UNC thread direction. This part is typically installed by maintenance technicians, machinists, and mechanical assembly professionals.

This button socket cap screw is suited for light to medium clamping applications where a rounded, low-profile head is preferred over a standard hex cap or flat-head profile. The black oxide finish provides mild corrosion resistance and reduces light reflection in exposed assemblies. Common installation environments include machine frames, fixtures, panels, and equipment enclosures where internal hex drive access is available. The UNC thread standard makes it compatible with standard inch-system tapped holes commonly found in North American manufacturing and industrial maintenance contexts.

Key Features

• Button head profile with 3/16 inch hex socket drive for low-clearance installations
• Fully threaded shank, 1 inch length under head, 5/16-18 UNC thread
• Alloy steel construction with 36-43 HRC hardness per ASTM F835
• Black oxide finish for mild corrosion resistance and reduced surface glare
• Thread fit class 3A, right-hand thread direction
• Meets ANSI/ASME B18.3 dimensional standards

Compatibility

Designed for use in standard inch-system tapped holes with 5/16-18 UNC thread form. Suitable as a direct replacement or general-use fastener in any application requiring an ANSI/ASME B18.3 button socket cap screw of this size and thread.

Installation Notes

Install using a 3/16 inch hex key or socket driver. Verify that the mating tapped hole is clean and free of debris before threading the fastener. Minimum order quantity is 50 pieces per order. Always torque fasteners to application-appropriate values per engineering specifications or applicable mechanical codes — do not exceed material or joint limits.