Value Collection JY4919452 Straight Flute Tap 1-1/4-12 Unf

Product Description

The VALUE COLLECTION JY4919452 is a straight flute tap designed to cut 1-1/4-12 UNF internal threads in a left-hand direction. Built from high-speed steel (HSS) with a bright/uncoated finish, this tap is suited for threading operations where no coating is required and cutting conditions are moderate. The plug chamfer distributes cutting load gradually, making it appropriate for through-hole and moderate blind-hole applications. With 4 flutes and an H4 thread limit, it holds a 3B class of fit, which is the standard tolerance class for general-purpose unified internal threads. Overall length is 5.75 inches and the tap weighs approximately 2.18 pounds.

This tap is used in machine shops, toolrooms, and maintenance environments where left-hand threaded fasteners or components are required. Left-hand taps are specified when assemblies are subject to rotation that would loosen a right-hand thread, such as certain spindle assemblies, turnbuckles, and counter-rotating shaft components. The 1-1/4-12 UNF thread form is a fine-pitch unified thread commonly found in precision mechanical and hydraulic fittings. Machinists, tool-and-die makers, and maintenance mechanics working with left-hand thread requirements will use this tap in manual or CNC tapping operations.

Key Features

• Left-hand thread direction for counter-rotation and specialty assembly applications
• 1-1/4-12 UNF thread form with 3B class of fit for general-purpose tolerance
• H4 thread limit for consistent fit across production runs
• Plug chamfer style for through-holes and moderate-depth blind holes
• 4-flute straight design for chip management in standard threading operations
• High-speed steel construction, bright/uncoated finish suitable for a range of workpiece materials

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 1-1/4-12 UNF left-hand internal thread, 3B class of fit, in materials compatible with uncoated high-speed steel tooling.

Installation Notes

This tap is installed and operated by qualified machinists or maintenance mechanics using manual tap handles or CNC tapping equipment. Ensure the workpiece is securely fixtured and the tap is properly aligned with the pilot hole before engagement to prevent tap breakage. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or chipping before each use, as a damaged tap can produce out-of-tolerance threads or seize in the hole.