Osg 2104400 Spiral Point Extension Tap 3/8-24 Unf Hss

Product Description

The OSG 2104400 is a spiral point plug extension tap designed for threading operations requiring extended reach in confined or deep-bore applications. Built from high speed steel (HSS), this tap features a bright uncoated finish and a 3/8-24 UNF thread form with an H3 thread limit, producing a Class 3B fit suitable for close-tolerance threaded assemblies. With an overall length of 6 inches and a thread length of 1.25 inches, the extended shank provides clearance where standard-length taps cannot reach. The three-flute, right-hand spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole tapping in production and maintenance environments.

This tap is intended for use in machine tapping operations on a range of common materials including aluminum, carbon steel, cast iron, and hardened steel. The reduced shank design allows it to be chucked in standard tap holders or CNC tapping heads. Typical installation scenarios include deep bosses, blind passages requiring extension, and production fixtures where spindle-to-work clearance is limited. Machinists and tool-and-die professionals will find this tap applicable in both job-shop and production settings.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• H3 thread limit and Class 3B fit for close-tolerance thread production
• High speed steel construction for durability across a range of workpiece materials
• Extended 6-inch overall length provides reach in deep or obstructed setups
• Reduced shank diameter compatible with standard tap holders and machine spindles
• Bright uncoated finish suitable for use with cutting fluids on aluminum, carbon steel, and cast iron

Compatibility

Designed as a machine tap for through-hole tapping of 3/8-24 UNF threads in aluminum, carbon steel, cast iron, and hardened steel workpieces using standard tap holders or CNC tapping attachments.

Installation Notes

This tap is intended for installation by machinists and toolroom professionals using tapping machines, CNC machining centers, or drill press setups with appropriate tap holders. Always ensure the workpiece is securely fixtured and the spindle is aligned axially with the pre-drilled pilot hole before engaging the tap. Use a suitable cutting fluid matched to the workpiece material to extend tool life and maintain thread quality. Inspect the tap for wear or chipping before each use and replace when thread form quality degrades.