Balax 12688-010 Thread Forming Tap 1/4-20 Unc Bottoming

Product Description

The BALAX 12688-010 is a thread forming tap designed for blind hole threading in a 1/4-20 UNC thread configuration with a 2B class of fit. Built from high-speed steel with a bright, uncoated finish, this bottoming-style tap produces threads by displacing material rather than cutting chips, resulting in stronger thread forms and reduced tap breakage risk. It carries an H8 thread limit and features a right-hand thread direction. The bottoming chamfer of 1.5 threads allows threading close to the bottom of a blind hole. Machinists and trade professionals working with ductile metals will find this tap suited to precision threading applications where thread quality and depth consistency matter.

This tap is used in blind hole threading operations on ductile materials such as aluminum, mild steel, and similar metals where material flow is acceptable. The BXOTL series bottoming configuration makes it appropriate for applications requiring maximum thread depth in a stopped bore. It is used in production machining, maintenance and repair operations, and fabrication environments where a 1/4-20 UNC thread standard is required.

Key Features

• Thread forming design displaces material for stronger threads and no chip generation
• Bottoming chamfer with 1.5P chamfered threads for threading close to hole bottom
• H8 thread limit for consistent 2B class of fit tolerance
• High-speed steel construction with bright uncoated finish
• Single oil groove design supports lubrication during forming
• Right-hand thread direction, 1/4-20 UNC standard

Compatibility

Designed as an OEM-style thread forming tap for blind hole threading applications requiring a 1/4-20 UNC thread form with a 2B class of fit and bottoming chamfer configuration.

Installation Notes

Thread forming taps require proper lubrication and are intended for use only in ductile materials that can tolerate material displacement. Ensure the correct tap drill size for a thread forming application is used, as it differs from a cutting tap drill chart. Secure the workpiece and use a calibrated tap handle or machine tapping attachment to maintain alignment and avoid tap breakage. Follow applicable shop safety procedures when operating drilling or tapping equipment.