Value Collection R63008326 Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION R63008326 is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. Sized at 4-40 UNC thread by 5/16 inches overall length, it features an 82-degree flat head and a 1/16-inch hex socket drive. Constructed from 18-8 stainless steel, this screw offers solid corrosion resistance for both indoor and outdoor environments. It is well suited for machine assembly, instrument panels, and light structural connections where a low-profile head is required and standard hex or Phillips drive access is limited.

This screw is a common fastener in precision mechanical assemblies, electronics enclosures, and light fabrication work. The 4-40 UNC thread size is frequently used in instrumentation, small appliances, and HVAC controls. Installers and machinists working in corrosive or high-humidity environments benefit from the 18-8 stainless steel construction, which resists rust and staining without the need for additional coatings or platings. The hex socket drive allows torque application in tight clearance situations where a wrench or open-driver cannot reach.

Key Features

• 82-degree flat head seats flush in standard countersunk holes for a low-profile finish
• 1/16-inch hex socket drive for use with a standard Allen key or hex bit
• 18-8 stainless steel construction provides corrosion and oxidation resistance
• 4-40 UNC thread standard ensures compatibility with standard tapped holes in that size
• 5/16-inch overall length suits thin panel and light structural fastening applications

Compatibility

Designed as an OEM-style replacement or standard fastener for applications using 4-40 UNC countersunk hex socket cap screws in 18-8 stainless steel.

Installation Notes

Installation is typically performed by machinists, assemblers, or service technicians using a 1/16-inch hex key or compatible bit driver. Ensure the receiving hole is properly countersunk to 82 degrees before installation to achieve a flush seating surface. Do not overtighten small-diameter fasteners such as 4-40 screws, as thread stripping is a common failure mode. De-energize any equipment and follow applicable safety lockout procedures before performing fastener work on live assemblies.