Osg 1206601 Spiral Point Tap 4-48 Unf 2 Flute Hss

Product Description

The OSG 1206601 is a spiral point tap designed for cutting internal 4-48 UNF threads in a wide range of metals. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole tapping applications where chip evacuation is a priority. Manufactured from high-speed steel with a steam oxide coating, the tap provides light lubricity and corrosion resistance during use. It carries an H2 thread limit and a 2B class of fit, targeting standard tolerance internal threads. Overall length is 1.875 inches with a thread length of 0.319 inches and a shank diameter of 0.141 inches. Machinists, tool-and-die professionals, and maintenance technicians are the primary users.

This tap is suited for through-hole tapping operations on aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The 4-48 UNF thread size places this tool in fine-pitch applications typical of small fastener work in precision assemblies, instrumentation, electronics enclosures, and light mechanical components. The plug chamfer provides a gradual lead-in with standard starting characteristics appropriate for general production and maintenance tapping setups.

Key Features

• Spiral point design pushes chips forward for clean through-hole tapping
• High-speed steel construction handles a broad range of ferrous and non-ferrous materials
• Steam oxide coating provides light lubricity and surface protection
• H2 thread limit with 2B class of fit for standard-tolerance internal threads
• Plug chamfer for controlled lead-in and general-purpose starting
• Right-hand cut, no coolant-through, non-interrupted thread profile

Compatibility

Designed for through-hole tapping of 4-48 UNF internal threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces. Fits standard tap holders and collets accommodating a 0.141-inch shank diameter.

Installation Notes

Tapping operations should be performed by a qualified machinist using a properly aligned tap holder, tapping head, or CNC rigid tapping cycle. Ensure the workpiece is securely fixtured before starting the tap. Use an appropriate cutting fluid or tapping compound for the material being machined to extend tool life and improve thread quality. Inspect the tap for wear or chipping before each use - a damaged tap should not be reused in a blind or close-tolerance hole.