Balax 12707-010 Extension Thread Forming Tap 1/4-20 H7

Product Description

The BALAX 12707-010 is a 1/4-20 UNC extension thread forming tap designed for producing internal threads without cutting chips. It uses a cold-forming action that displaces material rather than removing it, resulting in stronger threads and eliminating chip-clearance concerns. Built from high-speed steel with a bright, uncoated finish, this tap is suited for use in ductile metals and softer alloys where thread forming is practical. The 4-inch overall length makes it the right choice for reaching deep holes or recessed features that standard-length taps cannot access.

This tap is used in precision threading applications across metalworking, fabrication, and maintenance environments. The bottoming chamfer allows thread forming to begin very close to the bottom of a blind hole, making it appropriate for shallow-depth or full-thread-to-bottom requirements. The H7 thread limit targets a 2B class of fit, which is the standard tolerance range for most general-purpose inch-series threaded fastener assemblies. Machinists, tool-and-die makers, and maintenance mechanics in production and job-shop settings will find it well-suited to close-tolerance work.

Key Features

• Thread forming (chipless) design strengthens thread form by cold working the material
• Bottoming chamfer allows threading close to the bottom of blind holes
• H7 thread limit produces a 2B class of fit for standard inch-series assemblies
• 4-inch overall length provides extended reach for deep or recessed hole access
• High-speed steel construction offers durability across a range of ductile workpiece materials
• Right-hand flute direction for standard right-hand threading operations

Compatibility

Designed for use in 1/4-20 UNC threaded applications requiring a 2B class of fit and a bottoming thread form in blind-hole configurations where an extended-reach tap is required.

Installation Notes

Thread forming taps require a properly sized forming tap drill - the recommended hole diameter differs from a standard cut-tap drill and must be confirmed for the specific material and thread limit before use. Secure the workpiece and ensure the tap is aligned axially with the hole to prevent cross-threading or tap breakage. Apply appropriate tapping fluid for the workpiece material to reduce friction during forming. Always use a calibrated torque-limiting driver or tapping head when possible to avoid overloading the tap in harder or thinner-walled materials.