Balax 10285-010 Thread Forming Tap 2-56 Unc Bottoming Hss

Product Description

The BALAX 10285-010 is a thread forming tap designed for producing 2-56 UNC internal threads in blind hole applications. Unlike cutting taps, thread forming taps cold-form the thread profile without removing material, resulting in stronger threads with no chips to evacuate. This tap is manufactured from high-speed steel with a bright uncoated finish and carries an H5 thread limit, making it appropriate for close-tolerance threading work. At 1.75 inches overall length with a 0.4375-inch thread length, it fits standard tap handles and machine setups used by machinists and maintenance technicians working with small-diameter fastener threads.

This tap is suited for blind hole threading in ductile and malleable materials where chip-free forming is preferred. The bottoming chamfer, ground to approximately 2.5 threads, allows the tap to form threads close to the bottom of a blind hole. It is used in production and repair environments where 2-56 UNC threaded holes are required in small assemblies, instrument housings, or electronic enclosures. The Series BXB designation identifies this as part of BALAX's thread forming line built for reliability in small-pitch applications.

Key Features

• Thread forming design produces chip-free 2-56 UNC threads ideal for blind holes
• Bottoming chamfer with 2.5P lead for threading close to hole bottom
• High-speed steel construction for durability in production use
• H5 thread limit for controlled tolerance threading
• Right-hand thread direction, no coolant-through requirement
• No oil grooves - optimized for forming rather than cutting

Compatibility

Designed as a forming tap replacement for blind hole 2-56 UNC threading operations where a bottoming chamfer and H5 thread limit are specified.

Installation Notes

Thread forming taps require a slightly larger pilot hole than cutting taps - consult a thread forming drill chart for the correct forming drill size for 2-56 UNC before use. Adequate lubrication is essential; use a tapping fluid appropriate for the workpiece material. Secure the workpiece and ensure the tap is driven square to the hole to avoid tap breakage, especially at this small diameter. This tap is intended for use by machinists or qualified maintenance personnel familiar with small-diameter tapping operations.