Value Collection MSC-04919411 Hand Tap 1-1/4-7 Unc

Product Description

The VALUE COLLECTION MSC-04919411 is a bottoming hand tap designed for cutting left-hand internal threads in a 1-1/4-7 UNC configuration. Manufactured from high speed steel with a bright, uncoated finish, this tap is built for threading operations that require a full thread form close to the bottom of a blind hole. The 4-flute straight-flute geometry provides rigidity during hand-tapping operations and suits use in a range of machinable metals and alloys. Overall length is 5.75 inches with a thread length of 2.5625 inches. This tap carries a Class of Fit 3B designation and a Thread Limit of H4, making it appropriate where tolerance control is critical.

This tap is intended for hand-tapping applications in machine shops, maintenance facilities, and toolrooms where left-hand threaded fastener holes are required. The bottoming chamfer allows threading to within a few pitches of the bottom of a blind hole, making it the final tap used in a standard 3-tap sequence following taper and plug taps. It is suited for use in steel, cast iron, aluminum, and similar workpiece materials in both production and repair contexts. Licensed machinists, tool-and-die makers, and maintenance mechanics are the primary users.

Key Features

• Bottoming chamfer geometry for threading close to the bottom of blind holes
• Left-hand thread direction for left-hand fastener applications
• 1-1/4-7 UNC thread form with Class of Fit 3B and Thread Limit H4
• High speed steel construction for durability across a range of machinable materials
• 4-flute straight-flute design provides stable cutting action during hand tapping
• Bright uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or standard tooling addition for any application requiring a 1-1/4-7 UNC left-hand bottoming hand tap with a 3B Class of Fit and H4 thread limit.

Installation Notes

This tap is installed by hand using a tap wrench; power tapping with this tool is not recommended without confirming the tap is rated for machine use. Always secure the workpiece and use an appropriate cutting fluid for the material being tapped. Back the tap out periodically to clear chips and prevent binding or breakage. Follow applicable shop safety practices and wear eye protection during all tapping operations.