Value Collection 581387PR Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 581387PR is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1/4-20 UNC thread pattern and a 6-inch length under the head with partial threading. The drive is a 3/16-inch internal hex (Allen) socket, requiring a hex key or hex bit driver for installation. Made from alloy steel with a black oxide finish, this fastener delivers solid corrosion resistance and is suited for demanding service environments. It conforms to ASME/ANSI B18.3 and ASTM A574 standards. Machinists, millwrights, and maintenance technicians are the typical installers.

This screw is used in mechanical assemblies, fixtures, machine frames, and equipment maintenance applications where a low-profile, high-torque fastener is needed. The partial threading allows for clamping force across unthreaded shank length, which is useful when fastening two or more components where thread engagement only at the far end is desired. It is appropriate for both shop fabrication and field repair work across a wide range of industries.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped holes
• 6-inch length under head with partial threading for extended shank grip
• 3/16-inch hex socket drive for positive torque transfer with standard hex keys
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides moderate corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standard

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw suitable for use in any tapped hole or assembly conforming to ASME/ANSI B18.3 dimensional requirements for socket head cap screws.

Installation Notes

Installation requires a 3/16-inch hex key or hex bit driver. Ensure the mating tapped hole is clean and free of debris before installation. Power down or de-energize any equipment before performing fastener work on live assemblies. Apply thread lubricant or thread-locking compound as required by the specific application to achieve proper clamp load.