Balax 11685-010 Thread Forming Extension Tap 8-32 H5

Product Description

The BALAX 11685-010 is a thread forming extension tap designed for cutting 8-32 UNC internal threads in applications where standard-length taps cannot reach. Manufactured from high-speed steel with a bright, uncoated finish, this tap uses a cold-forming process that displaces material rather than cutting it, producing stronger threads with no chips to clear. The H5 thread limit and 2B class of fit make it well suited for precision fastener applications in metal fabrication, industrial assembly, and equipment manufacturing. It is typically installed by machinists, tool and die workers, and maintenance technicians working on production machinery or equipment frames.

This extension tap is intended for use in blind or deep holes where additional reach beyond a standard tap is required. The bottoming chamfer style allows threading close to the bottom of a blind hole. With an overall length of 3 inches and a thread length of 0.75 inches, it provides the clearance needed for recessed or hard-to-access threaded holes. It fits standard tap handles and machine tap holders compatible with the 0.168-inch shank diameter and right-hand flute direction.

Key Features

• Thread forming design displaces material without producing chips, resulting in stronger threads and cleaner holes
• 8-32 UNC thread size with H5 thread limit for precise 2B class of fit
• Bottoming chamfer allows threading to the bottom of blind holes
• High-speed steel construction provides durability across a range of metals
• Extended 3-inch overall length reaches recessed or obstructed hole locations
• Right-hand flute direction, bright uncoated finish, no reduced shank

Compatibility

Designed as a direct-fit replacement or supplement for standard 8-32 UNC thread forming taps in applications requiring extended reach. Compatible with tap handles and machine holders accepting a 0.168-inch shank diameter with a 0.131-inch square drive and 0.25-inch square length.

Installation Notes

This tap should be installed by a qualified machinist or maintenance technician familiar with tapping speeds and feed rates for thread forming operations. Always secure the workpiece and ensure proper alignment before beginning the tapping operation to avoid tap breakage. Use an appropriate cutting or forming fluid for the workpiece material to extend tap life and improve thread quality. Inspect the tap for wear or damage before each use and replace if the forming surface shows visible deterioration.