Value Collection 581131PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 581131PR is a 4-40 UNC hex socket cap screw designed for precision fastening in mechanical assemblies, fixtures, and equipment. The screw features a 1-3/4 inch length under head and is partially threaded, providing a firm clamping surface in the unthreaded shank area. The 3/32 inch hex drive accepts a standard Allen key or hex bit driver. Manufactured from alloy steel with a black oxide finish coating, this fastener delivers solid tensile strength and basic corrosion resistance for general industrial and maintenance applications. It is sized for small-diameter threaded work where torque requirements and space constraints demand a compact, recessed-head fastener.

This screw is suited for use in light machinery, instrument panels, jigs, fixtures, and electronic enclosures where 4-40 UNC threading is the specified standard. The hex socket drive is particularly useful in recessed or tight-clearance installations where a slotted or Phillips driver would not fit. Mechanical assemblers, maintenance technicians, and precision fabricators are the typical installers. This fastener is sold with a minimum order quantity of 100 pieces per order.

Key Features

• 4-40 UNC thread size for small-diameter precision fastening applications
• 1-3/4 inch length under head with partial threading for improved clamping grip
• 3/32 inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 fastener standards
• Black oxide finish coating provides basic corrosion resistance and reduced light reflection

Compatibility

Designed as a standard 4-40 UNC hex socket cap screw for use in any application requiring this thread size and a recessed hex drive, conforming to ASME/ANSI B18.3 dimensional standards.

Installation Notes

Installation is performed by mechanical assemblers or maintenance technicians using a 3/32 inch hex key or Allen-style driver. Ensure the mating threaded hole or nut is clean and free of debris before driving. Do not exceed the torque rating for 4-40 UNC alloy steel fasteners as specified in your engineering documentation. Apply thread-locking compound only when specified by the assembly design.