Osg 2811401 Spiral Point Tap 4-40 Unc 2 Flute Plug Hss

Product Description

The OSG 2811401 is a spiral point tap designed for cutting 4-40 UNC internal threads in a wide range of metals. The spiral point geometry pushes chips forward ahead of the tap, keeping the flutes clear and reducing the risk of chip packing in through-hole applications. Built from vanadium high speed steel with a steam oxide finish, this tap offers improved lubricity and corrosion resistance compared to uncoated tooling. It features a plug chamfer with an H3 thread limit, making it well-suited for close-tolerance threading work. This tap is installed by machinists, tool and die makers, and maintenance technicians working with ferrous and non-ferrous materials.

The 2811401 is suited for through-hole tapping in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, and cast iron. The plug chamfer makes it a practical choice for production tapping and repair threading where the tap enters a clean, through-hole. It belongs to OSG Series 280 and carries a right-hand thread direction. Typical applications include machine assembly, enclosure fabrication, and general metalworking where 4-40 UNC fastener threads are required.

Key Features

• Spiral point geometry pushes chips forward, reducing packing in through-hole applications
• Vanadium high speed steel construction for durability in ferrous and non-ferrous materials
• Steam oxide coating improves surface lubricity and provides mild corrosion resistance
• H3 thread limit for close-tolerance 4-40 UNC threading
• Plug chamfer provides gradual thread engagement suitable for through-hole tapping
• Right-hand cut, no coolant-through requirement for standard machining setups

Compatibility

Designed for through-hole tapping of 4-40 UNC threads in aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron.

Installation Notes

Tapping should be performed by a qualified machinist or technician using a properly aligned tap wrench, tapping head, or CNC spindle set to the correct speed for the workpiece material. Always apply a suitable cutting fluid or tapping compound to extend tool life and improve thread quality. Secure the workpiece firmly before tapping to prevent movement that can break the tap. Inspect the tap for wear or chipping before each use and replace if cutting edge integrity is compromised.