Value Collection MSC-04915120 Hand Tap 9/16-12 Unc Lh

Product Description

The VALUE COLLECTION MSC-04915120 is a 9/16-12 UNC left-hand plug hand tap machined from bright, uncoated high speed steel. It is designed for cutting internal left-hand threads by hand or with a tap wrench in ferrous and non-ferrous materials. The plug chamfer — typically 3 to 5 threads — allows the tap to start easily in through-holes or blind holes where sufficient clearance exists at the bottom. With four straight flutes, chips are pushed back toward the entry of the hole, making this tap well suited for threading applications where standard right-hand tooling cannot produce the required thread direction. Overall length is 3-19/32 inches with a thread length of 1-21/32 inches.

This tap is used in machine shops, maintenance environments, and fabrication settings where left-hand threaded assemblies are required — such as rotating shaft retention hardware, turnbuckles, and left-hand fastener repairs. The H3 thread limit provides a controlled oversize tolerance suitable for general-purpose tapping of standard UNC fits. It is suited for hand tapping operations performed by machinists, millwrights, pipefitters, and maintenance technicians.

Key Features

• 9/16-12 UNC thread form, left-hand direction for reverse-thread applications
• Plug chamfer (3-5 threads) for easy entry into through-holes and blind holes with clearance
• 4-flute straight flute geometry pushes chips back toward the entry point
• H3 thread limit for controlled oversize tolerance on standard UNC fits
• Bright, uncoated high speed steel construction — no coolant-through required
• 3-19/32 inches overall length with 1-21/32 inches of usable thread length

Compatibility

Designed as a standard replacement or stock hand tap for 9/16-12 UNC left-hand threaded applications in general machining and maintenance work.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench or suitable hand-tapping fixture. Secure the workpiece firmly before starting the tap, and apply cutting fluid appropriate to the workpiece material to reduce heat and extend tool life. For left-hand taps, turn counterclockwise to cut and clockwise to back out chips. Back the tap out periodically to clear chips and prevent binding or breakage.