Osg 2886300 Spiral Point Tap 1/2-20 Unf 3 Flutes Plug 2B Hss

Product Description

The OSG 2886300 is a spiral point tap designed for threading 1/2-20 UNF internal threads in through-hole applications. It features a plug chamfer with 3 flutes and is manufactured from high-speed steel with a bright finish. The spiral point geometry pushes chips forward ahead of the cut, making it well suited for through-hole tapping where chip evacuation is a priority. The H3 thread limit and 2B class of fit keep tolerances consistent with standard UNF fastener assemblies. Overall length is 3.375 inches with a thread length of 0.941 inches and a shank diameter of 0.367 inches. Machinists, tool-and-die makers, and maintenance technicians working in production or repair environments are the primary users.

This tap is rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is a right-hand tap intended for use in right-hand threaded holes. The plug chamfer style, typically 3 to 5 lead threads, makes it suitable for through-hole tapping in a drill press, CNC machining center, or hand tapping setup. It does not support coolant-through delivery. Applications range from automotive and general manufacturing to field maintenance where 1/2-20 UNF threads are required.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• Plug chamfer with 3 flutes for balanced cutting action and good chip flow
• High-speed steel construction for durability across steel and aluminum workpieces
• H3 thread limit with 2B class of fit for standard UNF tolerance control
• Right-hand thread direction, no coolant-through requirement
• Bright finish with no coating for easy visual inspection of tool wear

Compatibility

Designed for tapping 1/2-20 UNF through-holes in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces. Compatible with standard 1/2-20 UNF tap holders and floating tap adapters accepting a 0.367-inch shank diameter.

Installation Notes

This tap should be installed in a rigid tap holder or floating tap adapter sized for the 0.367-inch shank. Secure the workpiece before beginning the tapping operation and use an appropriate tapping fluid for the workpiece material to extend tool life. For hand tapping, apply consistent downward pressure with a tap wrench and back off periodically to break chips. Always verify hole diameter and depth are within specification for the 1/2-20 UNF thread before starting.