Osg 2905608 Spiral Flute Tap 2-56 Unc Ticn Vanadium Hss

Product Description

The OSG 2905608 is a spiral flute tap designed for cutting 2-56 UNC internal threads in a range of ferrous materials. Built from vanadium high-speed steel and finished with a titanium carbonitride (TiCN) coating, this tap delivers extended tool life in demanding tapping applications. The 45-degree helix angle evacuates chips efficiently by pulling them up and out of the hole, making it well suited for blind-hole work. A modified bottoming chamfer allows threading close to the bottom of a hole. Machinists and tool-and-die professionals use this tap in CNC machining centers, drill presses, and tapping arms where consistent thread quality in small-diameter holes is required.

This tap is rated for use in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The 2B class of fit is the standard commercial tolerance for most UNC fastener applications. With an H2 thread limit, the tap produces threads within a controlled oversize range to account for material springback, particularly in tougher alloys. It is a single-unit tool appropriate for production runs and precision repair work where a 2-56 thread is specified.

Key Features

• 45-degree right-hand spiral flute geometry for efficient chip evacuation in blind holes
• TiCN coating increases surface hardness and reduces friction for longer tool life
• Modified bottoming chamfer allows threading close to the bottom of a blind hole
• Vanadium high-speed steel construction handles alloy steel, stainless steel, and hardened steel
• H2 thread limit maintains 2B class of fit with controlled oversize for material springback
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 2-56 UNC, 2B class of fit internal thread in ferrous materials including alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with small-diameter tapping procedures. Always secure the workpiece and use the appropriate tapping fluid or cutting oil for the material being threaded. Power down or disengage the spindle before loading or removing the tap from the holder. Avoid reversing under power without confirming the machine setup is rated for spiral flute taps to prevent tap breakage in the 2-56 diameter range.