Allied Machine 451H-21.5 Spade Drill Insert 21.5mm Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 451H-21.5 is a cobalt spade drill insert engineered for high-performance drilling in demanding industrial applications. Designed for the GEN2 T-A modular drill system, this insert features a 132-degree point angle and a Seat Size 1 designation. The insert is finished with an AM200 PVD coating, which is a physical vapor deposition treatment that enhances wear resistance and extends tool life when drilling into hard or abrasive workpiece materials. At 0.1563 inches thick, the insert delivers consistent geometry and reliable seating in compatible T-A holders. Installation is performed by qualified machinists or toolroom technicians.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, titanium, and hard materials. It fits into the GEN2 T-A spade drill holder system and is commonly used in production machining, job shop, and heavy manufacturing environments where consistent hole quality and tool longevity are required. The 21.5 mm diameter and 132-degree point angle make it well suited for general through-hole and blind-hole drilling operations in a wide range of workpiece materials across multiple ISO material groups.

Key Features

• 21.5 mm cutting diameter with a 132-degree point angle for clean entry and reduced thrust
• Cobalt substrate provides elevated heat and wear resistance compared to standard HSS inserts
• AM200 PVD coating extends tool life in steel, stainless steel, cast iron, super-alloys, titanium, and hard materials
• Seat Size 1 designation for direct fit into compatible GEN2 T-A spade drill holders
• 0.1563-inch insert thickness maintains consistent seating geometry and dimensional accuracy

Compatibility

Designed for use with GEN2 T-A series spade drill holders accepting a Seat Size 1 insert. Compatible workpiece materials include steel (ISO P), stainless steel (ISO M), cast iron (ISO K), super-alloys and titanium (ISO S), and hard materials (ISO H).

Installation Notes

This insert is installed and replaced by machinists or tool crib technicians following the holder manufacturer torque and seating procedures. Ensure the machine spindle is powered down and locked out before changing inserts. Inspect the holder seat for chips or debris before seating the new insert. Use only the recommended insert screw and driver supplied or specified by the holder manufacturer to avoid seat damage.