Osg 1206005 Spiral Point Tap 3-48 Unc Tin Hss

Product Description

The OSG 1206005 is a spiral point tap designed for threading 3-48 UNC holes in a wide range of metals. It features a plug chamfer, two flutes, and a titanium nitride (TiN) coating over a high-speed steel (HSS) body. The spiral point geometry pushes chips forward ahead of the cut, making it well suited for through-hole tapping where chip evacuation is critical. The H2 thread limit holds tight tolerances for a 2B class of fit. Overall length is 1.813 inches with a thread length of 0.496 inches and a shank diameter of 0.141 inches.

This tap is used in production and maintenance machining environments where 3-48 UNC threads are required. It handles a broad range of workpiece materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Typical applications include tapping threaded holes in small fastener locations, instrument panels, and precision assemblies. It is installed by machinists, tool-and-die technicians, and maintenance mechanics using a tap wrench, drill press, or CNC tapping cycle.

Key Features

• Spiral point design pushes chips forward for efficient through-hole tapping
• TiN coating improves surface hardness and extends tool life across ferrous and non-ferrous materials
• High-speed steel construction provides toughness for interrupted and continuous cuts
• H2 thread limit delivers consistent 2B class of fit tolerances
• Right-hand thread direction for standard tapping operations
• No coolant-through requirement simplifies setup on manual and CNC equipment

Compatibility

Designed for tapping 3-48 UNC through holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

Secure the workpiece and ensure the pilot hole diameter matches the recommended tap drill size for 3-48 UNC before starting. Power down or disengage the spindle before loading the tap into the holder. Use cutting fluid appropriate for the workpiece material to reduce heat and extend tap life. Follow shop safety procedures and applicable machining standards when operating tapping equipment.