Balax 12404-010 Thread Forming Tap 12-24 Unc Bottoming Hss

Product Description

The BALAX 12404-010 is a thread forming tap designed for blind hole threading in a 12-24 UNC configuration with a Class 3B fit and H4 thread limit. Unlike cutting taps, thread forming taps displace material rather than cut it, producing stronger threads with no chips to clear. This tap features a bottoming chamfer with 2.5 chamfered threads, making it well suited for threading close to the bottom of a blind hole. Constructed from high-speed steel with a bright uncoated finish, it measures 2.375 inches overall length with a 0.62 inch thread length. It is installed by machinists, toolroom technicians, and maintenance trades working with ductile metals.

This tap is intended for blind hole applications where thread formation near the bottom of a bore is required. The bottoming chamfer style allows threading deeper into the hole compared to plug or taper chamfer taps. The 12-24 UNC thread standard is common in light mechanical assemblies, electrical enclosures, and instrumentation hardware. The BXB series designation indicates this is a BALAX form tap designed for use in materials such as aluminum, copper, brass, and soft steels where chip-free threading is preferred.

Key Features

• Thread forming design displaces material rather than cutting, eliminating chips in blind holes
• Bottoming chamfer with 2.5 chamfered threads for threading close to the bottom of a bore
• 12-24 UNC thread form with Class 3B fit and H4 thread limit for consistent tolerance
• High-speed steel construction provides hardness and wear resistance for production use
• Single oil groove aids lubricant distribution during the forming operation
• Right-hand thread direction, compatible with standard tapping equipment and tap handles

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for 12-24 UNC blind hole threading applications in ductile and malleable workpiece materials.

Installation Notes

Thread forming taps require adequate lubrication and are installed by machinists or maintenance technicians using a tapping machine, CNC machining center, or hand tap wrench. Always ensure the correct tap drill size for thread forming is used, as it differs from the drill size for cutting taps. Power down and secure the workpiece before tapping operations. Do not use thread forming taps in brittle materials such as cast iron or hardened steel, as material displacement is not possible in those substrates.