Value Collection JY4870069 Hand Tap 1-1/4-8 Uns Bottoming Hss

Product Description

The VALUE COLLECTION JY4870069 is a bottoming hand tap designed to cut internal threads in blind holes where full thread depth near the bottom of the hole is required. Ground from high speed steel (HSS) with a bright, uncoated finish, this tap holds a 1-1/4-8 UNS thread form and a H5 thread limit for controlled fit tolerances. The 4-flute straight-flute geometry provides good chip clearance in through and shallow blind-hole applications. With an overall length of 5.75 inches and a thread length of 2.5625 inches, this tap suits bench work and machine tapping operations in metalworking and maintenance environments.

This tap is used in industrial, maintenance, and fabrication settings where 1-1/4-8 UNS internal threads are required. The bottoming chamfer — typically 1 to 2 threads of taper — allows threading to within one or two thread pitches of the bottom of a blind hole. It is appropriate for use in ferrous and non-ferrous metals when used with proper cutting fluid. Machinists, tool and die makers, and maintenance technicians typically reach for this style of tap to finish threads started with a taper or plug tap.

Key Features

• Bottoming chamfer allows threading close to the bottom of a blind hole
• 1-1/4-8 UNS thread form with H5 thread limit for consistent fit tolerance
• High speed steel construction for durability across ferrous and non-ferrous materials
• 4-flute straight-flute design provides balanced cutting action and chip clearance
• Bright, uncoated finish — compatible with a wide range of cutting fluids
• Right-hand thread direction, the standard for conventional tapping operations

Compatibility

Designed for cutting 1-1/4-8 UNS right-hand internal threads. Fits standard tap wrenches and machine tap holders sized for 1-1/4-inch taps. Use as the final tap in a taper-plug-bottoming sequence when full thread depth in a blind hole is required.

Installation Notes

Secure the workpiece before tapping and ensure the starting hole is drilled to the correct tap drill diameter for a 1-1/4-8 thread. Apply a suitable cutting fluid throughout the tapping operation to extend tool life and improve thread finish. Back the tap off periodically to break chips and prevent tap breakage. Follow applicable shop safety practices and wear appropriate eye protection during all machining operations.