Value Collection 581049PR Hex Socket Cap Screw 2-56 Unc

Product Description

The VALUE COLLECTION 581049PR is a hex socket cap screw designed for applications requiring a compact, high-strength fastener in tight spaces. Manufactured from alloy steel with a black oxide finish, this screw features a 2-56 UNC thread and measures 7/8 inches in length under the head. It is partially threaded, making it suited for clamped-joint applications where thread engagement into a tapped hole is preferred. The 5/64 inch hex drive accepts a standard hex key or Allen wrench. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional accuracy and mechanical strength. It is used by machinists, assembly technicians, and maintenance professionals across precision manufacturing and mechanical assembly environments.

This screw is commonly used in light-duty mechanical assemblies, instrument enclosures, fixture work, and electronic equipment where a small-diameter machine screw with a recessed drive head is required. The 2-56 UNC thread is one of the finer unified coarse designations at this diameter, providing good thread engagement in thin or precision-tapped components. The black oxide coating offers a degree of corrosion resistance and reduces light reflection, which can be relevant in optical or electronic assembly contexts. Installation requires a 5/64 inch hex key.

Key Features

• 2-56 UNC thread for use in precision-tapped holes at this small diameter
• 7/8 inch length under head with partial threading for clamped-joint fastening
• 5/64 inch hex socket drive compatible with standard hex keys
• Alloy steel construction meets ASTM A574 mechanical strength requirements
• Black oxide finish for mild corrosion resistance and low-reflectance appearance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or standard-stock fastener for any tapped 2-56 UNC hole requiring a hex socket cap screw per ASME/ANSI B18.3 dimensional specifications.

Installation Notes

Installation is performed using a 5/64 inch hex key or Allen wrench. Ensure the mating tapped hole is clean and free of debris before threading the screw. De-energize or power down any equipment before fastener replacement or adjustment on assemblies involving electrical components. Do not overtighten small-diameter screws in soft materials such as aluminum or plastic, as thread stripping can occur.