Osg 1205400 Spiral Point Tap 1-72 Unf 2 Flute Plug Hss

Product Description

The OSG 1205400 is a spiral point tap designed for cutting internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright finish, it cuts a 1-72 UNF thread profile with a plug chamfer that eases entry into blind and through holes. The two-flute spiral point geometry pushes chips forward ahead of the cutting zone, reducing clogging and improving thread quality. It is sized for small-fastener applications where precision fit matters, conforming to a 2B class of fit and H2 thread limit. Machinists and tool-and-die professionals use this tap in both manual and CNC tapping operations.

This tap is suited for threading small-diameter holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. It is a common choice in production machining, maintenance and repair, and precision fabrication environments where a 1-72 UNF thread is specified. The plug chamfer style makes it appropriate for through-hole applications as well as applications where adequate chip clearance is maintained.

Key Features

• 1-72 UNF thread profile with 2B class of fit for standard tolerance internal threads
• H2 thread limit for controlled thread sizing
• Two-flute spiral point geometry pushes chips forward to clear the cutting zone
• Plug chamfer for reliable thread entry in through-hole applications
• High-speed steel construction handles aluminum, cast iron, carbon steel, and hardened steel
• Bright finish with no coolant-through requirement for straightforward setup

Compatibility

Designed for cutting 1-72 UNF internal threads in workpieces made from aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with tapping feeds, speeds, and cutting fluid selection for the workpiece material. Always secure the workpiece firmly and use appropriate tapping fluid or cutting oil to extend tool life and improve thread finish. Ensure the tap holder is properly aligned to the hole axis before engagement to avoid tap breakage, particularly critical at this small diameter. Inspect the tap for wear or damage before each use.