Balax 13126-010 Thread Forming Tap 5/16-18 Unc Bottoming

Product Description

The BALAX 13126-010 is a thread forming tap designed for producing 5/16-18 UNC internal threads in blind holes without generating chips. Built from high-speed steel with a bright uncoated finish, this bottoming-style tap features a 1.5-thread chamfer that allows threading close to the bottom of a blind hole. The H6 thread limit ensures consistent class 3B fit tolerances. With an overall length of 2.7188 inches and a tapping depth of 1.1250 inches, it suits precision threading operations in manufacturing, machining, and maintenance environments. A licensed machinist or toolroom technician is the typical end user.

This tap is suited for blind hole threading applications in materials compatible with high-speed steel tooling. The bottoming chamfer makes it the correct choice when a plug or taper tap has already started the thread and maximum thread depth is required. Series BXOTL designates it as a forming tap, meaning it displaces material rather than cutting it, which produces stronger threads and eliminates chip evacuation concerns in deep blind holes. It is commonly used in production machining and field repair scenarios where a clean, tight thread is required near the bottom of a drilled hole.

Key Features

• Thread forming design displaces material rather than cutting, producing stronger threads with no chips
• Bottoming chamfer with 1.5 chamfered threads allows threading to the bottom of blind holes
• H6 thread limit holds class 3B fit for consistent tolerance control
• High-speed steel construction with bright uncoated finish for general-purpose use
• Right-hand thread direction, 5/16-18 UNC specification
• Single oil groove supports lubrication during forming

Compatibility

Designed as an OEM-style replacement tap for 5/16-18 UNC bottoming thread forming applications in blind holes across general machining and maintenance tooling setups.

Installation Notes

Thread forming taps require proper lubrication and a correctly sized forming tap drill hole, which differs from a standard cut tap drill size. Always secure the workpiece and use a calibrated tap handle or machine spindle aligned to the hole axis to avoid tap breakage. De-energize and lock out any powered equipment before tapping holes in place on machinery. Follow applicable shop safety standards when working with rotating tooling.