Value Collection 307040PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 307040PR is a hex socket cap screw designed for precision fastening in mechanical assemblies, machinery, and fabricated equipment. This fastener features a 4-40 UNC thread size, a 1/4 inch length under head, and a 5/64 inch hex drive. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light reflection. The part meets ASTM A574 standards for socket head cap screws, making it appropriate for applications where tensile strength and thread integrity are critical. Machinists, maintenance technicians, and assembly professionals typically install this type of fastener in light-duty precision equipment and instrumentation.

This screw is suited for small-bore fastening applications in mechanical devices, electronic enclosures, fixtures, and tooling where a low-profile socket head and fine thread engagement are required. The fully threaded shank provides maximum thread engagement across the full grip length, which is beneficial in shallow threaded holes. Typical use cases include panel assembly, instrument mounting, and jig and fixture construction in both shop and field environments.

Key Features

• 4-40 UNC thread for fine-pitch engagement in small diameter applications
• 1/4 inch length under head for shallow fastening scenarios
• 5/64 inch hex socket drive for use with standard Allen or hex key tools
• Fully threaded shank maximizes thread engagement in thin material
• Alloy steel construction meets ASTM A574 tensile requirements
• Black oxide finish provides mild corrosion resistance and reduces glare

Compatibility

Designed as a standard ASTM A574-compliant hex socket cap screw suitable for use in any application requiring a 4-40 UNC fully threaded fastener with a 5/64 inch hex drive.

Installation Notes

Install using a 5/64 inch hex key or Allen driver; avoid using worn or undersized keys to prevent drive recess rounding. Ensure the mating threaded hole is clean and within tolerance before driving to prevent galling or cross-threading. Do not exceed the rated torque range for a 4-40 alloy steel fastener as defined by the applicable assembly specification. These fasteners are sold in minimum order quantities of 100 units.