Value Collection JY4914131 Straight Flute Tap 1/2-13 Unc

Product Description

The VALUE COLLECTION JY4914131 is a straight flute tap designed to cut internal threads in pre-drilled holes. Built from high-speed steel with a bright, uncoated finish, this tap produces a 1/2-13 UNC left-hand thread to a 3B class of fit with an H3 thread limit. It features 4 flutes and a plug chamfer, making it suitable for through-holes and moderately deep blind holes where chip evacuation is manageable. At 3.375 inches overall length, it fits standard tap handles and machine tool holders used in production and maintenance environments. Left-hand thread orientation is required for specific applications where standard right-hand threading would loosen under operational torque.

This tap is used in metalworking applications requiring left-hand UNC threads, including repair work on fasteners, fixtures, and mechanical assemblies. It is appropriate for use on steel, cast iron, and similar ferrous materials where high-speed steel tooling performs reliably. Typical users include machinists, tool and die makers, and maintenance mechanics working in manufacturing, industrial maintenance, and job shop environments. The plug chamfer style distributes cutting load across several leading threads, reducing torque demand during hand or machine tapping.

Key Features

• 1/2-13 UNC thread size with left-hand thread direction for specialized fastener applications
• Plug chamfer distributes cutting forces across multiple threads for smoother entry
• H3 thread limit provides controlled oversize tolerance for plated or tight-tolerance work
• 3B class of fit matches standard internal thread tolerance requirements
• High-speed steel construction offers good wear resistance across a range of ferrous materials
• Bright, uncoated finish allows visual inspection of tool condition after each use

Compatibility

Designed as an OEM-style replacement tap for applications requiring a 1/2-13 UNC, 4-flute, plug-chamfer, left-hand straight flute tap with an H3 thread limit and 3B class of fit.

Installation Notes

This tap should be used by qualified machinists or maintenance mechanics familiar with thread-cutting procedures. Always ensure the workpiece is securely fixtured and that the correct tap drill size for 1/2-13 UNC threads is used before tapping. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Do not force a tap that has stalled — back the tap out to clear chips before continuing, especially in blind-hole applications.