Balax 15029-000 Thread Forming Tap 7/8-9 Unc Plug Hss

Product Description

The BALAX 15029-000 is a thread forming tap designed for through-hole threading applications in metal fabrication and machining. Unlike cutting taps, thread forming taps cold-form internal threads without producing chips, resulting in stronger thread forms and cleaner finished holes. This tap is manufactured from high-speed steel with a bright uncoated finish and belongs to the BXP series. It carries a 7/8-9 UNC thread size with a plug chamfer and a thread limit of H9, making it suitable for achieving Class 3B fits. The overall length is 4.6875 inches with a 1-inch thread length, suited for production and maintenance threading work.

This tap is used in through-hole threading operations on ferrous and non-ferrous materials where a chip-free threading process is preferred. The plug chamfer style, with 4 chamfered threads, provides a balance between starting ease and thread engagement depth, making it practical for both through-hole production runs and general machining setups. Machinists, tool and die makers, and maintenance mechanics in industrial and manufacturing environments are the typical users of this tap size and style.

Key Features

• Thread forming design cold-forms threads without chips, producing stronger internal threads
• 7/8-9 UNC thread size with plug chamfer and 4 chamfered threads for reliable thread starts
• High-speed steel construction for durability across a range of workpiece materials
• H9 thread limit for consistent Class 3B fit tolerance control
• Single oil groove design supports lubrication flow during forming operations
• Right-hand thread direction, standard orientation for most threading setups

Compatibility

Designed as an OEM-style thread forming tap for through-hole applications requiring 7/8-9 UNC internal threads at Class 3B fit. Verify spindle taper and tap holder square drive compatibility with the 0.523-inch square drive size before installation.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which differs from standard cutting tap drill sizes - consult a thread forming tap drill chart before drilling. Use a recommended tapping fluid or cutting oil appropriate for the workpiece material to reduce forming torque and extend tap life. Secure the workpiece and ensure the tap is driven perpendicular to the hole to avoid cross-threading or tap breakage. This tap is installed using a standard tap wrench or machine tapping chuck compatible with the square drive shank size.