Value Collection R63066222 Flat Head Machine Screw 1/2-13

Product Description

The VALUE COLLECTION R63066222 is a 1/2-13 x 3-inch flat head slotted machine screw manufactured from 18-8 stainless steel with a bright, uncoated finish. It features a Unified National Coarse (UNC) thread form with a 1/2-13 thread size, meaning 1/2-inch nominal diameter and 13 threads per inch. The overall length and length under head are both 3 inches, indicating a fully threaded shank. This fastener is used in mechanical assembly, structural mounting, and equipment fabrication applications where corrosion resistance and a flush-seated, countersunk installation are required. Electricians, plumbers, HVAC technicians, and general mechanical contractors commonly specify 18-8 stainless hardware for corrosive or outdoor environments.

This screw is suited for use in residential and light commercial applications where a flush, countersunk fastening point is needed. The flat head profile seats into a countersunk hole, leaving the fastener flush with or below the surface of the workpiece. The slotted drive accommodates standard flat-blade screwdrivers. Grade 18-8 stainless steel provides good resistance to rust and oxidation, making this screw appropriate for installations near moisture, chemical exposure, or in outdoor equipment panels and enclosures.

Key Features

• 1/2-13 UNC thread — 1/2-inch nominal diameter, 13 threads per inch for broad compatibility with standard tapped holes
• 3-inch overall length with full 3-inch length under head for through-fastening applications
• Flat head profile designed for countersunk installations, producing a flush or recessed surface finish
• Slotted drive accepts standard flat-blade screwdrivers and bits
• 18-8 stainless steel construction with bright, uncoated finish for corrosion resistance in wet or outdoor environments
• No washer — installs directly without an integrated washer flange

Compatibility

Designed for use in any application requiring a 1/2-13 UNC tapped hole or nut with a countersunk flat head seating surface. Fits standard UNC-threaded hardware, nuts, and tapped assemblies in inch-measurement systems.

Installation Notes

Installation is performed by mechanical and trade technicians using a flat-blade screwdriver or slotted bit of the appropriate tip width for a 1/2-13 screw head. The mating hole must be countersunk to the correct angle to properly seat the flat head flush. Always verify thread engagement depth and confirm the tapped hole or nut meets UNC 1/2-13 specifications before installation. When used in structural or load-bearing applications, follow applicable mechanical codes and engineering specifications for fastener torque and joint design.