Allied Machine 451H-20 Spade Drill Insert 20mm Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 451H-20 is a cobalt spade drill insert designed for high-performance drilling in demanding metal-cutting applications. It features a 20 mm cutting diameter, a 132-degree point angle, and an AM200 PVD coating that extends tool life in abrasive and work-hardening materials. The insert fits Seat Size 1 holders in the GEN2 T-A spade drill system. This insert is installed by machinists and tooling technicians working on CNC mills, lathes, and dedicated drilling machines in production environments.

The 451H-20 is suited for drilling into a wide range of workpiece materials including steel, stainless steel, cast iron, super-alloys, titanium, and hard materials. It is a metric-system insert and is appropriate for both light production and high-volume drilling operations where insert indexability reduces downtime. The GEN2 T-A platform is commonly used in aerospace, automotive, and general machining environments that require repeatable hole quality at depth.

Key Features

• 20 mm cutting diameter for consistent, repeatable hole sizing
• 132-degree point angle reduces thrust and improves chip formation on entry
• AM200 PVD coating provides wear resistance across steel, stainless steel, cast iron, super-alloys, titanium, and hard materials
• Cobalt substrate delivers toughness in interrupted cuts and difficult-to-machine alloys
• Indexes into GEN2 T-A Seat Size 1 holders for fast insert changeout without removing the holder from the spindle

Compatibility

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

Installation Notes

Insert seating and clamping should be performed by a qualified machinist or tooling technician following the holder manufacturer's torque and seating procedures. Power down and lock out the spindle before indexing or replacing the insert. Inspect the seat pocket for chips or debris before installing a new insert, as contamination can cause insert rocking and premature failure. Follow applicable shop safety standards and machine tool manufacturer guidelines during changeout.