Balax 12243-010 Extension Thread Forming Tap 10-32 Unf

Product Description

The BALAX 12243-010 is a thread forming extension tap designed for cutting 10-32 UNF internal threads in blind or deep-reach applications. Built from high-speed steel with a bright uncoated finish, this tap uses a cold-forming method that displaces material rather than cutting chips, producing stronger threads with no swarf to clear. The H3 thread limit and bottoming chamfer make it well suited for close-tolerance work in shallow-depth holes. At 4 inches overall length, it extends reach beyond what a standard-length tap can access, while maintaining the rigidity needed for consistent thread quality.

This tap is used in machining, maintenance, and repair operations where standard-length taps cannot reach recessed or deep-set hole locations. Typical applications include threading blind holes in sheet metal, aluminum, mild steel, and similar ductile materials. The bottoming chamfer engages threads close to the bottom of the hole, maximizing thread engagement in short blind bores. It is used in production shops, toolrooms, and field maintenance environments by machinists, tool and die makers, and MRO technicians.

Key Features

• Thread forming design displaces material without cutting chips, producing stronger threads and eliminating swarf
• Bottoming chamfer allows threading close to the bottom of blind holes
• 4 inch overall length provides extended reach for deep or recessed hole locations
• H3 thread limit supports close-tolerance 3B class of fit applications
• High-speed steel construction provides durability across a range of ductile workpiece materials
• Right-hand flute direction for standard clockwise tapping operations

Compatibility

Designed as an OEM-style replacement or direct-use extension tap for 10-32 UNF thread forming applications requiring a bottoming chamfer and extended reach in production or maintenance settings.

Installation Notes

Thread forming taps require proper lubrication matched to the workpiece material to prevent galling and tap breakage. Ensure the tap is aligned perpendicular to the workpiece surface before engagement. Use a tapping stand, drill press, or CNC setup when possible to maintain alignment on deep-reach operations. Do not use thread forming taps on cast iron, hardened steel, or other non-ductile materials where chip-cutting taps are required.