Value Collection 201151PR Button Socket Cap Screw 5/16-24

Product Description

The VALUE COLLECTION 201151PR is a button socket cap screw designed for fastening applications that require a low-profile head and a hex socket drive. Manufactured from alloy steel with a black oxide coating, this screw measures 5/16-24 thread size with a 1-inch length under the head. The 3/16-inch hex socket drive accepts a standard hex key for installation. Hardness is rated at 36 to 43 HRC, making this screw suitable for moderate- to high-strength clamping needs. It is fully threaded and conforms to ANSI/ASME B18.3 and ASTM F835 standards. Licensed tradespeople and maintenance professionals in mechanical, industrial, and fabrication settings are the typical end users.

This screw is used in applications where a rounded, low-profile button head is preferred over a standard socket head cap screw. Common install scenarios include machine guards, panels, fixtures, and assemblies where the fastener head must sit flush or near-flush against a mating surface. The black oxide finish provides mild corrosion resistance and reduces light reflection, which is useful in tooling and equipment enclosure applications. The UNF thread standard ensures compatibility with fine-thread tapped holes in ferrous and non-ferrous materials.

Key Features

• Low-profile button head reduces protrusion in tight-clearance assemblies
• Alloy steel construction with 36 to 43 HRC hardness for reliable clamping strength
• Black oxide coating provides mild corrosion resistance and matte appearance
• 3/16-inch hex socket drive for use with standard hex keys or hex bit drivers
• Fully threaded 5/16-24 UNF thread form for consistent engagement in fine-thread holes
• Meets ANSI/ASME B18.3 and ASTM F835 dimensional and performance standards

Compatibility

Designed as a standard replacement or stock fastener for fine-thread tapped holes requiring a 5/16-24 UNF button socket cap screw per ANSI/ASME B18.3 and ASTM F835 specifications.

Installation Notes

Installation is performed with a 3/16-inch hex key or matching hex socket bit. Before installation, confirm the tapped hole thread class matches the 3A thread fit class of this screw to ensure proper engagement. Apply thread-locking compound or specified preload torque per the assembly engineering documentation, as no torque value is provided with this fastener. Do not exceed the rated hardness limits by applying impact drivers at high speed, which can damage the socket drive recess.