Allied Machine 155T-0224 Spade Drill Insert 2-3/4 in Cobalt Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 155T-0224 is a cobalt spade drill insert designed for high-performance hole-making in demanding materials. Part of the T-A Series, this insert measures 2-3/4 inches in diameter and fits a Seat Size 5 holder. It features a Physical Vapor Deposition (PVD) titanium nitride (TiN) coating applied over a cobalt substrate, which increases surface hardness and extends tool life in abrasive cutting conditions. The 144-degree point angle geometry is suited for controlled entry and reduced thrust in tougher workpiece materials. Installed by machinists and metalworking professionals, this insert is a direct replacement component for compatible T-A Series spade drill bodies.

This insert is engineered for use with T-A Series Seat Size 5 spade drill holders in CNC machining centers, lathes, and production drilling applications. It is rated for use in steel, stainless steel, cast iron, super-alloys, and titanium workpieces, corresponding to ISO material groups P, M, K, and S. Typical applications include through-hole and blind-hole drilling in structural components, flanges, and heavy manufacturing parts where insert changeability and consistent hole quality are priorities.

Key Features

• 2-3/4 inch diameter, Seat Size 5 - direct fit for compatible T-A Series spade drill bodies
• Cobalt substrate provides enhanced toughness and heat resistance compared to standard HSS
• PVD TiN coating increases surface hardness and reduces built-up edge in ferrous materials
• 144-degree point angle geometry reduces thrust and improves centering on entry
• Rated for steel, stainless steel, cast iron, super-alloys, and titanium (ISO groups P, M, K, S)
• Insert design allows quick changeover without removing the drill body from the machine spindle

Compatibility

Designed for use with T-A Series Seat Size 5 spade drill holders. Compatible workpiece materials include steel, stainless steel, cast iron, super-alloys, and titanium.

Installation Notes

Installation is performed by machinists or tooling technicians. Ensure the spindle is fully stopped and the machine is in an energy-isolated state before changing inserts. Seat the insert fully into the holder pocket and torque the clamping screw to the holder manufacturer specification - do not estimate clamp force by feel alone. Inspect the insert seat and holder pocket for chips or debris before seating to avoid insert rocking or premature failure.