Value Collection 581592PR Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581592PR is a hex socket cap screw designed for high-strength fastening applications requiring precise torque control and a low-profile head. Manufactured from alloy steel with a black oxide finish, this fastener measures 4.5 inches in length under the head and uses a 3/8-inch hex drive. The partial threading provides a stronger grip in through-bolt and clamping applications. At 0.27 pounds per unit, it is suited for mechanical assemblies, machine frames, fixtures, and industrial equipment. Machinists, millwrights, and maintenance technicians are the primary installers of this type of fastener.

This screw is used wherever a recessed hex drive cap screw is required in tight clearance areas or where a flush or near-flush head is necessary. The 1/2-20 UNF fine thread pitch offers higher tensile strength and better vibration resistance compared to coarse thread equivalents, making it well suited for precision mechanical assemblies, tooling plates, and load-bearing joints in both industrial and commercial settings. The black oxide coating provides moderate corrosion resistance and reduces surface glare in exposed applications.

Key Features

• 1/2-20 UNF fine thread for high tensile strength and vibration resistance
• 4.5 inches length under head with partial threading for solid clamping force
• 3/8-inch hex socket drive for use with standard hex keys and socket drivers
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish for moderate corrosion resistance and low-glare appearance

Compatibility

Designed as an OEM-style replacement or direct-use fastener for applications requiring a 1/2-20 UNF hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians familiar with fastener torque requirements for 1/2-20 UNF alloy steel cap screws. Use a properly sized 3/8-inch hex key or socket driver to avoid rounding the drive recess. Ensure mating threads are clean and free of debris before installation. Always follow applicable machinery safety lockout/tagout procedures before fastening into powered equipment.