Value Collection JY4919403 Hand Tap 1-1/4-7 Unc Lh Plug Hss

Product Description

The VALUE COLLECTION JY4919403 is a straight-flute hand tap designed for cutting 1-1/4-7 UNC left-hand internal threads in metalworking and machining applications. Built from high speed steel (HSS) with a bright, uncoated finish, this plug-chamfer tap is suited for through-hole and moderately deep blind-hole tapping where a left-hand thread is required. With four flutes and an H4 thread limit, it holds close tolerances for a Class 3B fit. Overall length is 5.75 inches and the tap weighs approximately 2.18 pounds. Licensed machinists, tool and die makers, and maintenance mechanics are the primary installers.

Left-hand taps are used wherever the application demands a thread that tightens in the counterclockwise direction, such as on bicycle pedals, certain automotive fasteners, and machinery components subject to counterclockwise rotation that would otherwise loosen a standard right-hand thread. This tap is intended for hand-tapping operations using a standard tap wrench. It is suitable for ferrous metals and other materials appropriate for HSS tooling at standard cutting speeds. The plug chamfer, with its moderate lead, makes it well suited to starting threads in a drilled through-hole or where adequate chip clearance exists.

Key Features

• Left-hand thread direction for applications requiring counterclockwise fastening
• Plug chamfer provides a moderate lead for through-hole and open blind-hole tapping
• High speed steel construction offers hardness and wear resistance for metalworking use
• Four straight flutes for chip clearance during hand-tapping operations
• H4 thread limit maintains Class 3B fit tolerances
• Bright, uncoated finish — no coating buildup to affect thread dimension

Compatibility

Designed as an OEM-style replacement or direct-use hand tap for 1-1/4-7 UNC left-hand thread applications in standard tap wrenches and tapping fixtures that accept this shank size.

Installation Notes

This tap is installed by hand using a suitable tap wrench; secure the workpiece firmly before beginning. Ensure the drilled hole diameter matches the correct tap drill size for a 1-1/4-7 UNC thread before tapping. Apply cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. Left-hand taps turn counterclockwise to cut — confirm thread direction before starting to avoid damage to the tap or workpiece.