Value Collection JY4919650 Hand Tap 1-1/2-12 Unf

Product Description

The VALUE COLLECTION JY4919650 is a left-hand, plug-chamfer hand tap designed for cutting 1-1/2-12 UNF internal threads in pre-drilled holes. Built from high speed steel with a bright uncoated finish, it delivers reliable performance across a range of workpiece materials in production and maintenance machining environments. The 4-flute straight flute geometry provides balanced cutting action and chip clearance. This tap meets a 3B class of fit with an H4 thread limit, making it suitable for standard tolerance internal thread applications. Overall length is 6-3/8 inches and the tap weighs approximately 3.48 pounds.

This tap is used in machine shop, maintenance, repair, and fabrication settings where left-hand internal UNF threads are required. The plug chamfer, with its moderate lead-in length, makes it well suited for through-hole tapping and for following a taper or bottoming tap sequence when threading blind holes. It is typically run by hand or with a low-speed tapping attachment and is a practical choice for toolmakers, machinists, and maintenance technicians working with larger diameter fastener applications.

Key Features

• Left-hand thread direction for applications requiring reverse-threaded fasteners or assemblies
• Plug chamfer provides a moderate 3-5 thread lead-in for versatile through-hole and blind-hole use
• 4-flute straight flute design balances cutting force and chip evacuation
• High speed steel construction offers good toughness and wear resistance across common workpiece materials
• Bright uncoated finish allows easy visual inspection of cutting edge condition
• 3B class of fit and H4 thread limit meet standard tolerance requirements for UNF internal threads

Compatibility

Designed for cutting 1-1/2-12 UNF left-hand internal threads in accordance with Unified National Fine thread standards. Suitable for use with standard tap wrenches and tapping attachments accepting the appropriate square-drive shank size for this tap diameter.

Installation Notes

This tap is installed and operated by licensed machinists or skilled maintenance technicians using a tap wrench or low-speed tapping attachment. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1-1/2-12 UNF thread before starting. Apply appropriate cutting fluid for the workpiece material throughout the tapping operation to extend tool life and improve thread finish. Back off the tap periodically to break chips and prevent binding, particularly in deeper holes.