Allied Machine 457H-0328 Spade Drill Insert 3-7/8 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 457H-0328 is a cobalt spade drill insert designed for high-performance hole-making in demanding machining applications. With a 3-7/8 inch diameter, Seat Size 7, and a 144-degree point angle, this insert fits the GEN2 T-A spade drill system and delivers consistent cutting performance across a range of workpiece materials. The AM200 PVD coating provides wear resistance and thermal stability, extending tool life in production environments. Machinists and tooling specialists install this insert into compatible T-A spade drill holders for precision drilling operations.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, titanium, and hard materials, covering ISO material groups P, M, K, S, and H. It is intended for industrial machining environments including CNC drilling, heavy-duty production drilling, and precision boring setups where large-diameter, single-pass hole-making is required. The GEN2 T-A series is a modular indexable spade drill platform commonly used in both job-shop and high-volume production settings.

Key Features

• 3-7/8 inch diameter for large-bore drilling without a dedicated solid drill
• 144-degree point angle optimized for flat-bottom entry and reduced thrust
• Cobalt substrate provides toughness and heat resistance in difficult materials
• AM200 PVD coating enhances wear resistance and extends tool life
• Seat Size 7 compatibility fits standard GEN2 T-A spade drill holders
• Rated for steel, stainless steel, cast iron, super-alloys, titanium, and hard materials

Compatibility

Designed for use with ALLIED MACHINE AND ENGINEERING GEN2 T-A series spade drill holders accepting Seat Size 7 inserts. Compatible workpiece materials include steel (P), stainless steel (M), cast iron (K), super-alloys and titanium (S), and hard materials (H).

Installation Notes

Installation is performed by qualified machinists or tooling technicians. The machine spindle must be fully stopped and the tool holder secured before seating or removing the insert. Ensure the holder seat and clamping surfaces are clean and free of chips before installing the insert. Follow the tool holder manufacturer torque and clamping specifications for Seat Size 7 inserts.