Value Collection 201139PR Button Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 201139PR is a button socket cap screw designed for applications where a low-profile head is required alongside high fastener strength. Manufactured from alloy steel with a black oxide finish, this screw measures 5/16-18 thread size with a 7/8-inch length under the head. It is fully threaded and driven with a 3/16-inch hex socket. The black oxide coating provides moderate corrosion resistance and reduces light reflection, making it well suited for mechanical assemblies, tooling fixtures, and industrial equipment. It meets ANSI/ASME B18.3 and ASTM F835 standards and carries a hardness rating of 36-43 HRC.

This screw is a standard choice in mechanical, manufacturing, and light industrial settings where a flush or recessed fastener profile is needed. It is commonly used in machine guards, brackets, panels, and equipment housings. The UNC thread form and 3A thread fit class make it compatible with standard tapped holes in that thread size. Trades that regularly use this fastener include millwrights, machinists, maintenance technicians, and general contractors working on equipment assembly or repair.

Key Features

• Button head profile reduces protrusion height for clearance-sensitive assemblies
• Alloy steel construction with 36-43 HRC hardness for high load-bearing capacity
• Black oxide finish for moderate corrosion resistance and low-glare appearance
• Fully threaded 5/16-18 UNC right-hand thread with 3A fit class
• 3/16-inch hex socket drive for standard Allen key or hex bit installation
• Conforms to ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 5/16-18 UNC button socket cap screw suitable for use in any tapped hole conforming to that thread size and requiring a low-profile button head fastener per ANSI/ASME B18.3.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 3/16-inch hex key or socket bit. Ensure the mating tapped hole is clean and free of debris before threading. Do not exceed the rated torque for the fastener grade and always verify that the thread class of the tapped hole matches the 3A fit of this screw. Power down or de-energize any equipment before accessing fastened components in live machinery.