Value Collection JY4914206 1/2-20 Unf Straight Flute Tap

Product Description

The VALUE COLLECTION JY4914206 is a straight flute tap designed for cutting 1/2-20 UNF internal threads in a left-hand direction. Built from high-speed steel with a bright, uncoated finish, this tap delivers reliable performance in threading operations where standard coated tools are unnecessary. The plug chamfer — typically 3 to 5 threads — makes it well suited for through-hole threading applications where the tap can advance progressively into the workpiece. With 4 flutes and an H3 thread limit, it holds tight dimensional control for a 3B class of fit, meeting the tolerances required for precision fastener assemblies.

This tap is used by machinists, tool and die makers, and maintenance technicians working in metal fabrication, repair, and production environments. Its left-hand thread configuration makes it the correct choice for applications requiring reverse-direction fasteners — common in rotating equipment where right-hand threads would loosen under operational torque. The 3-3/8 inch overall length provides adequate shank engagement in standard tap handles and machine tool holders.

Key Features

• 1/2-20 UNF thread form for fine-pitch internal threading
• Left-hand thread direction for reverse-thread applications
• Plug chamfer style for through-hole and open-bottom threading
• H3 thread limit with 3B class of fit for controlled tolerance output
• 4-flute straight design for chip control in shorter-chipping materials
• High-speed steel construction with bright uncoated finish

Compatibility

Designed as an OEM-style replacement or direct-use tap compatible with standard tap handles, T-handle wrenches, and machine tool holders accepting straight-shank taps of this size class.

Installation Notes

This tap is installed and operated by machinists using manual tap handles or machine tapping equipment. Ensure the workpiece is properly fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1/2-20 UNF thread before beginning. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. Reverse the tap periodically when hand-tapping to break chips and prevent tap breakage.