Osg 2812901 Spiral Point Tap 8-32 Unc 3 Flute Plug

Product Description

The OSG 2812901 is a spiral point plug tap designed for cutting 8-32 UNC right-hand threads in a wide range of ferrous and non-ferrous materials. Manufactured from vanadium high-speed steel (HSS-E) with a steam oxide coating, this tap is built for through-hole tapping applications where chip evacuation forward through the hole is required. At 2.126 inches overall length with a 0.374-inch thread length and H4 thread limit, it delivers consistent tolerance control in production and maintenance threading operations. Licensed machinists, tool-and-die makers, and maintenance technicians are the typical end users.

This tap is suited for threading through-holes in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, and cast iron. The spiral point geometry pushes chips ahead of the cutting edge rather than packing them into the flute, making it the preferred choice for through-hole work on CNC machining centers, drill presses, and tapping arms. The 3-flute, plug chamfer configuration provides a balance of cutting speed and thread lead-in across general-purpose production environments.

Key Features

• 8-32 UNC thread form, right-hand direction, H4 thread limit for controlled tolerance fit
• Vanadium high-speed steel (HSS-E) construction for improved wear resistance over standard HSS
• Steam oxide coating reduces friction and provides light lubricity during cutting
• Spiral point geometry evacuates chips forward through the hole, preventing chip packing
• Plug chamfer with 3 flutes balances cutting entry and thread production efficiency
• No coolant-through design; suitable for use with external cutting fluid application

Compatibility

Designed as an OEM-style replacement or direct-use tap for through-hole 8-32 UNC threading operations in standard machine shop and maintenance environments. OSG Series 280 product family.

Installation Notes

Install in a tapping chuck, CNC rigid tap holder, or floating tap holder appropriate for the machine being used. Ensure the workpiece is securely fixtured before starting the cut. Apply a cutting fluid or tapping compound rated for the workpiece material to extend tool life and improve thread finish. Do not force a tap that has stopped advancing — back off to clear chips before continuing.