Value Collection 581146PR Hex Socket Cap Screw 4-48 Unf

Product Description

The VALUE COLLECTION 581146PR is a hex socket cap screw designed for precise, high-strength fastening in demanding mechanical and industrial applications. Featuring a 4-48 UNF thread size and a 3/8-inch length under the head, this screw is fully threaded and driven with a 3/32-inch hex key. Constructed from alloy steel with a black oxide finish, it delivers solid tensile strength and moderate corrosion resistance. Compliant with ASME/ANSI B18.3 and ASTM A574 standards, this fastener meets widely accepted dimensional and mechanical performance requirements. It is sold in multiples of 100 per order with a package quantity of 1.

This cap screw is suited for use in precision mechanical assemblies, instrumentation, tooling fixtures, and equipment requiring fine-threaded, tight-tolerance fastening. The 4-48 UNF thread pitch makes it appropriate for thin-material or close-tolerance applications where coarse threads are not practical. Machinists, maintenance technicians, and equipment assemblers commonly use this fastener in both production and field repair environments.

Key Features

• 4-48 UNF fine thread for tight-tolerance fastening applications
• Fully threaded shank, 3/8 inches length under head
• 3/32-inch hex drive for use with standard hex keys or Allen drivers
• Alloy steel construction for high tensile strength
• Black oxide coating provides moderate corrosion resistance and reduced light reflection
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for precision mechanical assemblies, instrumentation housings, and tooling fixtures requiring a 4-48 UNF fine-thread fastener.

Installation Notes

Install using a calibrated 3/32-inch hex key or Allen driver to avoid stripping the socket. Ensure the mating tapped hole is clean and free of debris before driving the fastener. Do not exceed the rated torque for 4-48 UNF alloy steel fasteners as specified by the applicable mechanical or equipment standard. Black oxide finish is not a substitute for additional corrosion protection in wet or outdoor environments.