Osg 1767101 Extension Tap 10-24 Unc 3 Flute H3 Spiral Flute

Product Description

The OSG 1767101 is a spiral flute extension tap designed for right-hand threading of 10-24 UNC threads in applications requiring extended reach. Built from vanadium high-speed steel with a steam oxide finish, this tap delivers durability and lubricity in demanding threading operations. The modified bottoming chamfer allows threading closer to the bottom of blind holes. With a 30-degree helix angle and 3 flutes, it efficiently evacuates chips upward, reducing the risk of chip packing. The H3 thread limit provides a controlled tolerance for reliable 2B and 3B class-of-fit thread production. Overall length is 4 inches, making it well suited for reaching recessed or deep features inaccessible to standard-length taps.

This extension tap is designed for threading operations in carbon steel, hardened steel, and stainless steel workpieces. The spiral flute geometry makes it particularly effective in blind-hole applications where chip evacuation is critical. It is suited for use in machine shops, maintenance environments, and production settings where reaching deep or offset features is required. The reduced shank design accommodates standard tap holders while allowing the extended reach the part is built for.

Key Features

• Spiral flute with 30-degree helix angle for upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading near the bottom of blind holes
• Vanadium high-speed steel construction for toughness in steel and stainless steel applications
• Steam oxide finish improves lubricity and surface hardness
• H3 thread limit for consistent 2B and 3B class-of-fit thread production
• Reduced shank design with 4 inches overall length for extended reach

Compatibility

Designed for threading 10-24 UNC right-hand threads in carbon steel, hardened steel, and stainless steel. Compatible with standard tap holders accepting a 0.194-inch shank diameter. Class of fit: 2B and 3B.

Installation Notes

This tap should be installed and operated by qualified machinists or tooling technicians familiar with tapping speeds, feeds, and cutting fluid requirements for the workpiece material. Power down and secure the workpiece before tap installation. Use appropriate cutting fluid for the material being threaded, particularly when working with stainless steel. Inspect the tap for wear or chipping before each use to avoid thread damage or tap breakage in the workpiece.