Allied 4C21P-.703 Spade Drill Insert 45/64 in Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 4C21P-.703 is a solid carbide spade drill insert designed for high-performance hole-making in demanding machining applications. Part of the GEN2 T-A series, this insert features a 132-degree point angle and an AM300 PVD coating applied over a C2 (K20) carbide grade substrate. The AM300 coating provides enhanced wear resistance and thermal stability, extending tool life when drilling through tough workpiece materials. At 0.703 inches in diameter (45/64 inch nominal) with a Seat Size 1 designation, this insert seats directly into compatible T-A style spade drill holders. Machinists and tool-and-die professionals specify this insert for precision boring operations where consistency and edge retention are critical.

This insert is suited for drilling stainless steel, cast iron, non-ferrous metals, and super-alloys including titanium. It is used in CNC machining centers, lathes with driven tooling, and manual boring mills across both production and job-shop environments. The GEN2 T-A series geometry is engineered to handle interrupted cuts and cross-hole applications where insert stability and point strength are essential. Aerospace, automotive, and general metalworking shops commonly use this insert series when hole tolerances and surface finish requirements are tight.

Key Features

• 45/64 inch (0.703 inch) diameter with Seat Size 1 for direct T-A holder compatibility
• Solid carbide construction in C2 (K20) grade for rigidity and wear resistance
• AM300 PVD coating for extended tool life in stainless steel, cast iron, non-ferrous metals, and super-alloys
• 132-degree point angle optimized for reduced thrust and clean entry geometry
• GEN2 T-A series design engineered for demanding production drilling environments

Compatibility

Designed as a replacement insert for GEN2 T-A series spade drill holders requiring a Seat Size 1 insert at 45/64 inch diameter. Consult the Allied Machine and Engineering GEN2 T-A holder selection guide to confirm holder-to-insert seating compatibility before installation.

Installation Notes

Insert installation and 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 torque wrench and insert screw to seat the insert properly in the holder pocket — do not overtighten or substitute fasteners. Inspect the holder pocket for chips, wear, or damage before seating a new insert. Follow your facility safety program and applicable OSHA machine guarding requirements when handling carbide cutting tools.