Value Collection R63008841 Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION R63008841 is a flat socket cap screw engineered for precision fastening applications where a flush or countersunk head profile is required. Sized at 4-40 UNC threading with an overall length of 5/8 inches, this screw features an 82-degree flat head geometry and a 1/16-inch hex socket drive. Manufactured from 18-8 stainless steel, it delivers reliable corrosion resistance in wet, chemical-exposed, or outdoor environments. Installers in electrical, mechanical, HVAC, and plumbing trades rely on fasteners like this where a low-profile head seating flush with the mating surface is critical to assembly integrity.

This fastener is suited for light-duty mechanical assemblies, panel mounting, enclosure work, and instrument-grade applications where a non-protruding head is required. The 4-40 UNC thread is a fine, small-diameter standard commonly found in electrical panels, control boxes, instrumentation housings, and small mechanical subassemblies. The 18-8 stainless steel construction makes it appropriate for environments where carbon steel fasteners would corrode prematurely. This item is sold individually but carries a minimum order quantity of 100 pieces per order.

Key Features

• 82-degree flat head seats flush with countersunk surfaces for a low-profile finish
• 1/16-inch hex socket drive for precise torque application in confined spaces
• 4-40 UNC thread standard for compatibility with common small-diameter tapped holes
• 18-8 stainless steel construction resists corrosion in wet or chemically active environments
• Overall length of 5/8 inches measured from head tip to thread end
• Inch measurement system; thread standard is UNC

Compatibility

Designed as a standard inch-series flat socket cap screw for use in any application requiring a 4-40 UNC thread and an 82-degree countersunk flat head seating profile.

Installation Notes

Install using a 1/16-inch hex key or Allen driver sized to fit the socket recess. Ensure the mating surface is properly countersunk to 82 degrees before seating the fastener to achieve a flush finish. Do not overtighten small-diameter stainless steel fasteners, as galling can occur; apply an anti-seize compound if repeated removal is expected. This fastener is typically installed by mechanical, electrical, or instrumentation technicians following applicable assembly specifications.