Osg 2908800 Spiral Flute Tap 10-32 Unf Vanadium Hss

Product Description

The OSG 2908800 is a spiral flute tap designed for cutting 10-32 UNF internal threads in a wide range of ferrous materials. Built from vanadium high-speed steel with a bright uncoated finish, it features a 45-degree right-hand helix and a modified bottoming chamfer for threading close to the bottom of blind holes. The H2 thread limit keeps tolerances tight for a 3B class of fit. With an overall length of 2.375 inches and a shank diameter of 0.194 inches, it fits standard tap holders used in machining and fabrication environments. Installation is performed by machinists and tool-and-die tradespeople working with drilling equipment or CNC tapping attachments.

This tap is suited for threading operations in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. It is typically used in production machining, repair shops, and fabrication settings where fine-thread 10-32 UNF fastener holes are required in blind-hole applications. The modified bottoming chamfer allows the tap to produce usable threads very close to the floor of a drilled hole, which is critical when thread engagement depth is limited by part geometry.

Key Features

• 10-32 UNF thread form with H2 thread limit for controlled 3B class of fit tolerance
• Modified bottoming chamfer for threading close to the bottom of blind holes
• 45-degree right-hand spiral flute helix evacuates chips upward, reducing clogging in blind holes
• Vanadium high-speed steel construction provides wear resistance across a broad range of ferrous workpiece materials
• Bright uncoated finish suitable for use with cutting oils and standard tapping fluids
• 3-flute design balances cutting load and chip clearance for fine-pitch threading

Compatibility

Designed for use in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces requiring 10-32 UNF threads at a 3B class of fit.

Installation Notes

This tap is installed and operated by machinists using a tap wrench, tapping head, or CNC tapping attachment. Always secure the workpiece and ensure the pilot hole is drilled to the correct tap drill diameter for 10-32 UNF before tapping. Apply an appropriate cutting fluid or tapping compound for the workpiece material, especially when threading stainless or hardened steel. Back the tap out periodically to break and clear chips when working in deep or blind holes.