Allied Machine 458H-0412 Spade Drill Insert 4-3/8 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 458H-0412 is a cobalt spade drill insert designed for high-performance drilling in demanding metalworking applications. It features a 4-3/8 inch diameter, a 144-degree point angle, and an AM200 PVD coating that extends tool life in abrasive and hard materials. The insert seats into a Seat Size 8 holder from the GEN2 T-A series, allowing fast blade changes without removing the holder from the spindle. Machinists, tooling engineers, and CNC operators working in production environments rely on this insert for consistent hole quality across a range of workpiece materials.

This insert is suited for drilling operations in steel, stainless steel, cast iron, super-alloys, titanium, and hard materials. The GEN2 T-A spade drill system is commonly used in horizontal and vertical machining centers, as well as engine lathes with live tooling. It is appropriate for both roughing and through-hole drilling in medium-to-large diameter applications where indexable spade tooling is preferred over solid carbide or high-speed steel alternatives.

Key Features

• 4-3/8 inch diameter for large-bore drilling without solid-drill lead times
• 144-degree point angle optimized for entry and chip control in ferrous and exotic materials
• AM200 PVD coating provides wear resistance and thermal stability
• Cobalt substrate handles interrupted cuts and high-feed applications
• Seat Size 8 interface fits GEN2 T-A series holders for quick blade indexing
• Compatible with steel, stainless steel, cast iron, super-alloys, titanium, and hard materials

Compatibility

Designed for use with GEN2 T-A series Seat Size 8 spade drill holders. Rated for primary workpiece materials coded P (steel), M (stainless steel), K (cast iron), S (super-alloys and titanium), and H (hard material) per ISO material classification.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Ensure the machine spindle is fully stopped and the tool holder is secured in the turret or spindle before indexing or replacing the insert. Use the appropriate torque wrench and seat screw specified by the holder manufacturer — do not over-torque the blade retention screw. Inspect the seat pocket for chips or debris before seating the new insert to ensure proper blade contact and runout.