Value Collection 581083PR Hex Socket Cap Screw 3-48 Unc

Product Description

The VALUE COLLECTION 581083PR is a hex socket cap screw designed for precision fastening in close-tolerance assemblies where a flush or recessed head profile is required. Manufactured from alloy steel with a black oxide finish, this fastener meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for demanding mechanical and structural applications. The 3-48 UNC thread is a fine-pitch coarse unified thread at the smaller end of the inch fastener spectrum, commonly used in instrumentation, electronics, and light mechanical assemblies. Drive engagement is via a 5/64 inch hex socket, and the screw runs fully threaded to 3/4 inch under the head, providing maximum thread engagement across the full shank length.

This fastener is suited for light industrial, instrumentation, and mechanical assembly work where a small-diameter, high-strength socket cap screw is specified. The black oxide coating provides mild corrosion resistance and reduces light reflection on exposed hardware. Typical applications include panel mounting, equipment chassis assembly, fixture fabrication, and machine component fastening where standard slotted or Phillips drives are impractical due to space constraints or torque requirements. Installation is performed by machinists, assembly technicians, and maintenance trades working with precision equipment.

Key Features

• 3-48 UNC thread form — fully threaded to maximize engagement in thin or short boss applications
• 3/4 inch length under head provides usable thread engagement through stacked components or standard boss depths
• Alloy steel construction meets ASTM A574 high-strength socket screw specification
• Black oxide finish reduces corrosion and minimizes light reflection in finished assemblies
• 5/64 inch hex socket drive allows use in confined spaces where wrenching room is limited
• Meets ASME/ANSI B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any tapped 3-48 UNC threaded hole requiring a 3/4 inch under-head length fastener.

Installation Notes

Installation requires a 5/64 inch hex key or socket driver; do not substitute an undersized key, as it will round the drive recess. Thread the fastener by hand initially to confirm proper thread engagement and avoid cross-threading, particularly in blind tapped holes. Apply appropriate thread-locking compound or preload torque per the assembly engineer's specification. This fastener is typically installed by machinists or assembly technicians and does not require licensed trade credentials.