Value Collection 581098PR Hex Socket Cap Screw 3-56 Unf

Product Description

The VALUE COLLECTION 581098PR is a hex socket cap screw designed for precision fastening applications requiring a compact, high-strength threaded connection. Sized at 3-56 UNF with a 5/16-inch length under head, this screw is fully threaded and driven with a 5/64-inch hex key. It is manufactured from alloy steel and finished with a black oxide coating, which provides moderate corrosion resistance and reduces light reflection. This fastener meets ASME/ANSI B18.3 and ASTM A574 dimensional and mechanical standards, making it suitable for applications where a recognized fastener specification is required.

This screw is used in light machinery, instrumentation, electronic assemblies, and precision mechanical components where a fine-threaded, small-diameter cap screw is specified. The 3-56 UNF thread form is common in tight-tolerance assemblies found in industrial equipment, fixtures, and tooling. Installation is typically performed by a machinist, technician, or mechanical assembler using a 5/64-inch hex key or Allen driver. The black oxide finish suits applications where a low-profile, non-reflective fastener appearance is preferred.

Key Features

• 3-56 UNF fully threaded profile for fine-pitch engagement in precision assemblies
• 5/16-inch length under head accommodates standard light-duty clamping depths
• 5/64-inch hex drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard-dimension replacement or maintenance fastener for assemblies specifying a 3-56 UNF hex socket cap screw per ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Install using a calibrated 5/64-inch hex key or driver to avoid rounding the socket drive. Ensure mating threads are clean and free of debris before assembly. Follow applicable torque guidelines from a recognized fastener reference for 3-56 alloy steel cap screws. Black oxide finish is not a heavy-duty corrosion barrier; use thread-locking compound or appropriate lubricant if the application requires it.