Value Collection 581138PR Hex Socket Cap Screw 4-48 Unf

Product Description

The VALUE COLLECTION 581138PR is a hex socket cap screw designed for applications requiring a compact, high-strength threaded fastener. It features a 4-48 UNF thread size, a 1/8 inch length under the head, and a 3/32 inch hex drive. Constructed from alloy steel with a black oxide finish, this fastener delivers solid tensile strength and moderate corrosion resistance in a small form factor. Fully threaded along its length, it provides maximum thread engagement for its size. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional and mechanical compliance for precision and structural applications.

This screw is suited for light mechanical assemblies, instrument panels, electronic enclosures, and precision equipment where a small-diameter, fine-thread fastener is required. The 4-48 UNF thread form is common in instrumentation, optical mounts, and close-tolerance machine work. The black oxide coating helps reduce light reflection and provides mild protection in dry or low-humidity environments. Sold in quantities of 100 per order, this screw is appropriate for production builds, maintenance stock, and bench-level repair work performed by machinists, technicians, and mechanical contractors.

Key Features

• 4-48 UNF fully threaded for maximum thread engagement in thin or shallow bosses
• 3/32 inch hex drive accepts standard hex key or Allen wrench for torquing in tight clearances
• Alloy steel construction provides high tensile strength relative to screw size
• Black oxide finish reduces surface reflection and offers mild corrosion resistance in dry environments
• Meets ASME/ANSI B18.3 and ASTM A574 standards for dimensional accuracy and mechanical properties
• Minimum order quantity of 100 units supports production and stocking applications

Compatibility

Designed as a standard-dimension replacement or production fastener for any application requiring a 4-48 UNF hex socket cap screw with a 1/8 inch length under head and 3/32 inch drive, per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is typically performed by machinists or mechanical technicians using a 3/32 inch hex key or T-handle Allen driver. Ensure the mating tapped hole is clean and free of debris before threading. Do not exceed the design torque range for 4-48 UNF alloy steel fasteners as determined by the assembly engineer or applicable specification. Black oxide coatings do not substitute for corrosion-resistant finishes in wet or outdoor environments.