Value Collection 701026PR Button Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 701026PR is a button socket cap screw designed for applications requiring a low-profile fastener with reliable clamping strength. Built from alloy steel with a black oxide finish, this screw is fully threaded in a 4-40 UNC thread size with a 7/16-inch length under the head. The 1/16-inch hex socket drive requires an appropriately sized hex key for installation. Hardness is rated at 36 to 43 HRC, indicating high tensile strength suitable for demanding mechanical assemblies. The thread fit class is 3A, which is the standard commercial tolerance for externally threaded fasteners. This screw conforms to ANSI/ASME B18.3 and ASTM F835 fastener standards.

This screw is used in precision mechanical assemblies, light machine frames, fixtures, and enclosures where a flush or low-profile fastener head is required. The button-head profile reduces the risk of snagging on adjacent components or covers. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it a common choice in instrumentation, electronics enclosures, and general industrial fabrication work. Licensed machinists, millwrights, and equipment technicians typically install fasteners of this type during assembly or field repair operations.

Key Features

• Button head profile provides low-profile, snag-resistant installation
• Alloy steel construction with 36 to 43 HRC hardness for high-strength applications
• Black oxide finish for mild corrosion resistance and reduced reflectivity
• 1/16-inch hex socket drive for precise torque application with a standard hex key
• Fully threaded 4-40 UNC right-hand thread with 3A fit class tolerance
• Meets ANSI/ASME B18.3 and ASTM F835 standards

Compatibility

Designed as a standard 4-40 UNC button socket cap screw for use in any application requiring an ANSI/ASME B18.3-compliant low-profile alloy steel fastener.

Installation Notes

Installation requires a 1/16-inch hex key or hex bit driver. Verify that mating threaded holes or nuts conform to the 4-40 UNC thread standard before installation. Use appropriate thread engagement depth per standard mechanical fastener practices. Avoid over-torquing, which can strip the small hex socket or damage the threaded bore in thin or soft materials.