Value Collection 581151PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 581151PR is a hex socket cap screw designed for threaded fastening applications requiring a compact drive profile and reliable clamping force. It features a 4-40 UNC thread and a 3/32 inch hex socket drive, accepting a standard hex key or Allen wrench. The fastener measures 9/16 inch in length under the head and is fully threaded along its entire shank. It is manufactured from alloy steel and finished with a black oxide coating, which provides moderate corrosion resistance and a low-reflectance surface. This screw is well suited for mechanical assemblies, tooling fixtures, and precision equipment where close-quarter access is required.

This screw is used across a wide range of light industrial and mechanical applications, including electronics enclosures, pneumatic components, instrument panels, and small-frame machinery. The 4-40 UNC thread is a common size in precision assemblies and is regularly specified in OEM equipment. It is typically installed by machinists, maintenance technicians, and assembly personnel working with metal-to-metal joints that demand consistent thread engagement. This fastener is sold in a minimum order quantity of 100 pieces per transaction with a package quantity of 1.

Key Features

• 4-40 UNC thread for use in standard unified national coarse tapped holes
• Fully threaded shank provides maximum thread engagement along the 9/16 inch under-head length
• 3/32 inch hex socket drive accepts standard hex key tooling
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion resistance and reduces surface glare
• Compact cap head profile suits recessed or flush-mount installation locations

Compatibility

Designed as a standard replacement or stock fastener for any application specifying a 4-40 UNC hex socket cap screw per ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation requires a 3/32 inch hex key or Allen driver. Ensure the mating tapped hole is clean and free of debris before threading the fastener by hand to confirm proper alignment. Apply consistent torque with a calibrated hex driver to avoid stripping the small-diameter thread. Power down any equipment completely before accessing fastener locations on live electrical or mechanical assemblies.