Allied Machine 151A-.921 Spade Drill Insert 59/64 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 151A-.921 is a cobalt spade drill insert designed for high-performance hole-making in demanding metalworking applications. Part of the T-A series, this insert features a 132-degree point angle and a titanium aluminum nitride (TiAlN) PVD coating that extends tool life under high heat and cutting pressure. At 59/64 inches in diameter with a Seat Size 1 designation, it fits directly into compatible T-A series spade drill holders. Machinists and tooling professionals in production and job-shop environments install this insert when drilling through steel, stainless steel, cast iron, and super-alloys including titanium.

This insert is suited for CNC machining centers, manual lathes, and drilling operations where repeatability and insert interchangeability are required. The T-A series platform allows the insert to be indexed or replaced without removing the holder from the spindle, reducing downtime in high-volume production runs. Primary workpiece materials include carbon and alloy steels, stainless steels, cast iron, super-alloys, and titanium, making it a versatile choice across aerospace, automotive, and general manufacturing applications.

Key Features

• 59/64 inches diameter with Seat Size 1 for T-A series holder compatibility
• 132-degree point angle reduces thrust and improves chip formation on entry
• Cobalt substrate provides increased hardness and heat resistance over standard HSS
• TiAlN PVD coating extends cutting life in high-temperature, abrasive materials
• Rated for steel, stainless steel, cast iron, super-alloys, and titanium workpieces
• Insert-style design allows quick changeout without removing the drill body from the machine

Compatibility

Designed for use with Seat Size 1 T-A series spade drill holders. Compatible primary workpiece material codes include P (steel), M (stainless steel), K (cast iron), and S (super-alloys and titanium).

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before seating or removing any insert. Use the correct T-A series insert screw and driver to achieve proper clamping torque per the holder manufacturer guidelines. Inspect the holder seat for wear or debris before installing a new insert to ensure accurate seating and prevent premature failure.