Balax 12925-010 Thread Forming Extension Tap 1/4-28 H5 Hss

Product Description

The BALAX 12925-010 is a thread forming extension tap designed for cutting internal UNF threads in ductile materials without producing chips. Manufactured from high-speed steel with a bright, uncoated finish, it produces 1/4-28 UNF threads to an H5 thread limit. The 4-inch overall length provides reach into recessed or deep-access areas where a standard tap cannot engage. The bottoming chamfer allows threading close to the bottom of blind holes. This tap is used by machinists, maintenance technicians, and mechanical contractors working with ferrous and non-ferrous metals where clean, strong threads are required without chip contamination.

The 12925-010 is suited for production and maintenance applications requiring extended reach on 1/4-28 UNF tapped holes. Its 1-inch thread length accommodates a range of material thicknesses, and the right-hand flute direction is compatible with standard tapping setups. The Series BXEXT designation indicates this is part of the BALAX extension tap line, engineered for situations where standard-length taps lack the clearance needed to reach the workpiece.

Key Features

• Thread forming design eliminates chips, reducing risk of contamination in blind holes
• Bottoming chamfer allows threading to near the bottom of blind holes
• 4-inch overall length provides extended reach for recessed and deep-access applications
• H5 thread limit ensures consistent fit for 2B and 3B class of fit specifications
• High-speed steel construction offers durability across a range of workpiece materials
• Right-hand flute direction compatible with standard tapping equipment

Compatibility

Designed as a replacement or supplemental tap for applications requiring 1/4-28 UNF thread forming in 2B and 3B class of fit specifications, compatible with standard tapping heads and extension tap holders accepting the BXEXT series shank geometry.

Installation Notes

Thread forming taps require appropriate cutting fluid or tapping compound for the workpiece material to prevent galling and extend tool life. Ensure the tap is properly aligned with the hole axis before applying torque to avoid tap breakage. Use a torque-limiting tapping head where available. This tap is intended for use by qualified machinists or mechanics familiar with tapping operations and proper speeds for high-speed steel tooling.