Balax 13528-010 Extension Thread Forming Tap 3/8-16 H8

Product Description

The BALAX 13528-010 is a thread forming extension tap designed for cutting 3/8-16 UNC internal threads in applications where standard-length taps cannot reach. At 6 inches overall length with a 1.25 inch thread length, this tap reaches deep into workpieces or through fixture setups that require extended reach. It is manufactured from high-speed steel with a bright uncoated finish and held to an H8 thread limit, making it well suited for close-tolerance threading in ductile and malleable materials. A bottoming chamfer allows threading to the bottom of blind holes. Machinists and tool and die professionals use this tap in production and maintenance settings.

This extension tap is intended for use in metalworking applications where standard-reach taps are insufficient, such as threading deep counterbores, recessed bosses, or blind holes in fixturing. The Series BXEXT design produces threads by forming rather than cutting, displacing material rather than removing chips. This makes it appropriate for materials that machine cleanly without chip buildup, reducing the risk of tap breakage in deep or restricted access holes. The 2B class of fit delivers a standard commercial thread tolerance suitable for most fastener and assembly applications.

Key Features

• Thread forming design displaces material without chips, reducing breakage risk in blind holes
• 6 inch overall length provides extended reach for deep or obstructed hole locations
• Bottoming chamfer allows threading to the full depth of a blind hole
• H8 thread limit holds close tolerance for consistent 2B class of fit results
• High-speed steel construction handles a wide range of metalworking conditions
• Right-hand flute direction, bright uncoated finish for standard applications

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for 3/8-16 UNC threading operations requiring extended reach in metalworking and machining applications.

Installation Notes

Thread forming taps require proper lubrication and correct tap drill sizing for the material being worked - consult published forming tap drill charts before use. Power down and secure the workpiece before setup. Use a torque-limited tap driver or CNC rigid tapping cycle with appropriate feed rate to avoid overloading the tap. Never reverse a thread forming tap under power without confirming the machine spindle supports it.