Value Collection R63008684 Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION R63008684 is a flat socket cap screw designed for precision fastening applications where a flush or countersunk head profile is required. Manufactured from 18-8 stainless steel, this screw offers good corrosion resistance suitable for general industrial, mechanical, and light marine environments. The 82-degree flat head seats into a standard countersink to sit flush with the mating surface. Drive is a 1/16-inch hex socket (Allen key), providing positive torque engagement in tight clearance areas. Thread size is 4-40 UNC with an overall length of 1/4 inch. Installed by machinists, maintenance technicians, and assembly professionals across a wide range of industries.

This screw is suited for light-duty fastening tasks where a low-profile or flush-mount head is needed. Common applications include instrument panels, electronic enclosures, fixtures, jigs, and precision mechanical assemblies. The 4-40 UNC thread is a fine-pitch standard commonly found in small mechanical and electrical equipment. The 18-8 stainless steel construction resists oxidation and mild chemical exposure, making it appropriate for both indoor and outdoor applications where carbon steel fasteners would corrode prematurely.

Key Features

• 82-degree flat head countersink profile for flush seating against the mating surface
• 1/16-inch hex socket drive for secure torque application in confined spaces
• 18-8 stainless steel construction for corrosion resistance in general-purpose environments
• 4-40 UNC thread standard for compatibility with common small-fastener tapped holes
• 1/4-inch overall length suits thin-panel and shallow-clearance installations

Compatibility

Designed as a standard 4-40 UNC flat socket cap screw for use in any application requiring an 82-degree countersunk hex-socket fastener in 18-8 stainless steel at 1/4-inch overall length.

Installation Notes

Installation requires a 1/16-inch hex key or Allen driver. The mating hole must be drilled and countersunk to an 82-degree angle to allow the flat head to seat fully flush. Ensure the tapped hole meets 4-40 UNC thread specifications before driving the fastener to avoid cross-threading. Do not exceed the material yield strength of 18-8 stainless steel when applying torque, as over-driving can strip the small hex socket or the thread.