Allied Machine 457H-0324 Spade Drill Insert 3-3/4 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 457H-0324 is a cobalt spade drill insert designed for high-performance deep-hole and through-hole drilling applications. Part of the GEN2 T-A series, this insert features a 144-degree point angle and an AM200 PVD coating that extends tool life when cutting through tough workpiece materials. The insert measures 3-3/4 inches in diameter with a Seat Size 7 designation and a thickness of 0.4375 inches. It is intended for use in compatible T-A style spade drill holders and is installed by machinists and tooling technicians in production and job-shop environments.

This insert is suited for drilling operations in steel, stainless steel, cast iron, super-alloys, titanium, and hard materials — covering ISO material groups P, M, K, S, and H. It is appropriate for CNC machining centers, lathes, and manual drill press setups where a replaceable-insert spade drill system is already in use. The GEN2 T-A series is a common choice in production environments where consistent hole geometry and insert interchangeability are priorities.

Key Features

• 3-3/4 inch diameter cutting edge for large-bore drilling operations
• 144-degree point angle reduces thrust and improves centering on entry
• Cobalt substrate provides heat resistance and toughness in interrupted cuts
• AM200 PVD coating extends wear life across steel, stainless, cast iron, super-alloys, titanium, and hard materials
• Seat Size 7 designation ensures compatibility with the correct GEN2 T-A holder body
• 0.4375-inch insert thickness for secure seating and rigid support during cutting

Compatibility

Designed for use with GEN2 T-A series spade drill holder bodies requiring a Seat Size 7 insert. Confirm holder series and seat size before ordering to ensure proper fit and torque transfer.

Installation Notes

Insert replacement should be performed by a qualified machinist or tooling technician with the machine fully powered down and the spindle locked. Use the manufacturer-specified insert screw and driver to seat the insert flush against the holder pocket — do not substitute fasteners. Inspect the holder pocket for wear or debris before installing a new insert, as a damaged seat will affect hole accuracy and insert life. Follow the holder manufacturer's clamping procedure to ensure the insert is fully engaged before returning the tool to service.