Value Collection R52001349 Flat Head Machine Screw 1/2-13x4

Product Description

The VALUE COLLECTION R52001349 is a 1/2-13 x 4 inch flat head slotted machine screw manufactured from steel with a zinc-plated finish. Conforming to ASME B18.6.3 and SAE J82 standards, this screw is suited for general industrial and mechanical fastening applications where a flush or countersunk installation is required. The 1/2-13 thread designation indicates a 1/2 inch nominal diameter with 13 threads per inch, UNC coarse thread series. Zinc plating provides a baseline level of corrosion resistance for interior and light-duty exterior environments. Installed by maintenance technicians, millwrights, and trade professionals across a wide range of assembly and repair tasks.

This screw is appropriate for structural and mechanical assembly applications where a countersunk flat head profile is needed to sit flush with or below the mating surface. The slotted drive accommodates standard flat-blade screwdrivers, making it accessible with common hand and power tools. The 4 inch overall length and coarse 1/2-13 thread make it a practical choice for fastening through thicker material stacks in equipment enclosures, frames, and general fabrication work.

Key Features

• 1/2-13 UNC coarse thread for broad compatibility with standard tapped holes
• 4 inch overall length with full 4 inch length under head
• Flat head profile for flush or countersunk installation
• Slotted drive compatible with standard flat-blade screwdrivers
• Zinc-plated steel construction for general-purpose corrosion resistance
• Meets ASME B18.6.3 and SAE J82 dimensional and material standards

Compatibility

Designed for use in standard 1/2-13 UNC tapped holes in steel, aluminum, and similar materials where a flat head slotted machine screw meeting ASME B18.6.3 is specified.

Installation Notes

Installation should be performed with a properly sized flat-blade screwdriver or bit to avoid cam-out and drive damage. Ensure the receiving hole is correctly tapped to 1/2-13 UNC and the countersink angle matches the flat head profile before driving. Apply appropriate thread lubricant or anti-seize compound when fastening into dissimilar metals to prevent galling. Follow applicable mechanical codes and torque specifications for the assembly being serviced.