Osg 1207601 Spiral Point Tap 6-40 Unf Plug Hss

Product Description

The OSG 1207601 is a spiral point plug tap designed for cutting right-hand internal threads in a 6-40 UNF thread form. Built from high-speed steel with a steam oxide coating, it reduces friction and resists wear during threading operations. The spiral point geometry pushes chips forward ahead of the cutting action, keeping the flutes clear and allowing continuous feeding in through-hole applications. With an overall length of 2 inches, a thread length of 0.39 inches, and a shank diameter of 0.141 inches, this tap fits standard tap holders and is sized for precise work in small-diameter fastener applications. Machinists, tool-and-die makers, and maintenance technicians install this tap in manual and machine-tapping setups.

This tap is suited for threading through-holes in a range of materials including low-carbon steel, medium-carbon steel, high-carbon steel, hardened steel, cast iron, aluminum, and cast aluminum. The plug chamfer provides a gradual thread lead-in with approximately 3 to 5 chamfered threads, making it the standard choice for most general through-hole tapping jobs in production and repair environments. The H2 thread limit holds tight tolerances and supports both 2B and 3B class-of-fit requirements.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• High-speed steel construction handles ferrous and non-ferrous materials
• Steam oxide coating reduces friction and provides light corrosion resistance
• H2 thread limit supports 2B and 3B class-of-fit tolerances
• Plug chamfer for standard lead-in in through-hole applications
• No coolant-through requirement - compatible with conventional hand or machine tapping with cutting fluid applied externally

Compatibility

Designed as a standard 6-40 UNF spiral point plug tap for use in through-hole tapping applications across materials including aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, and medium-carbon steel. Part of OSG Series 105.

Installation Notes

This tap should be installed in a properly sized tap holder or machine spindle aligned perpendicular to the workpiece surface. Always apply a suitable cutting fluid for the workpiece material before and during tapping to extend tool life and improve thread finish. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap-drill diameter for a 6-40 UNF thread before tapping begins. Do not force the tap if resistance increases sharply - back off to clear chips and reapply cutting fluid.