Osg 2103600 Spiral Point Tap 5/16-24 Unf H3 Hss

Product Description

The OSG 2103600 is a spiral point plug tap designed for threading 5/16-24 UNF right-hand internal threads in applications where standard-length taps cannot reach. Built from high speed steel with a bright uncoated finish, this extension tap measures 6 inches overall length with a 1-1/8 inch thread length and a reduced shank configuration. The H3 thread limit provides consistent tolerance control for 3B class of fit threads. With 2 flutes and a spiral point geometry, the tap pushes chips forward ahead of the cutting zone, making it well suited for through-hole threading operations. Machinists and maintenance technicians install this tap in manual or CNC tapping operations requiring extended reach.

This tap is designed for threading aluminum, carbon steel, cast iron, and hardened steel workpieces. The extension length makes it practical for deep bosses, recessed holes, and fixtures where a standard tap shank would contact the workpiece surface before full thread engagement is achieved. It is appropriate for production runs or maintenance work on equipment requiring UNF threaded fastener locations that standard-reach tooling cannot access. The plug chamfer style allows starting the tap in a pre-drilled through hole without requiring a bottom or taper tap for initial engagement.

Key Features

• Spiral point geometry pushes chips forward, suitable for through-hole tapping
• H3 thread limit for controlled 3B class of fit tolerance in UNF threads
• 6 inch overall length provides extended reach into deep or recessed features
• Reduced shank allows use in standard tap holders without clearance issues
• High speed steel construction handles aluminum, carbon steel, cast iron, and hardened steel
• Bright uncoated finish suitable for use with cutting fluids across general material ranges

Compatibility

Designed for cutting 5/16-24 UNF right-hand internal threads to a 3B class of fit in aluminum, carbon steel, cast iron, and hardened steel workpieces.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping arm, or CNC tapping head. Always use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Secure the workpiece firmly before tapping and confirm the pilot hole diameter matches the recommended tap drill size for 5/16-24 UNF threads. Inspect the tap for wear or chipping before each use and do not force a worn or damaged tap to avoid breakage in the hole.