Allied 4C21P-.765 Spade Drill Insert 49/64 in Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 4C21P-.765 is a solid carbide spade drill insert designed for high-performance drilling applications in demanding materials. Built to GEN2 T-A series specifications with a 49/64-inch diameter and Seat Size 1, this insert features a 132-degree point angle for precise, controlled entry. The AM300 PVD coating provides enhanced wear resistance and thermal stability, extending tool life in abrasive and heat-generating cuts. Machinists and tooling technicians install this insert into compatible T-A spade drill holders as a direct replacement or initial tooling setup on CNC and manual drilling equipment.

This insert is suited for production and job-shop drilling operations targeting stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium. The C2 (K20) carbide grade provides a balance of hardness and toughness appropriate for interrupted cuts and variable-hardness workpieces. It is commonly used in aerospace, automotive, and general metalworking environments where hole quality and tool life are critical factors in cycle time and cost control.

Key Features

• 49/64-inch diameter with Seat Size 1 for direct fit into GEN2 T-A series holders
• 132-degree point angle for controlled entry and reduced thrust force
• Solid carbide construction in C2 (K20) grade for high hardness and wear resistance
• AM300 PVD coating rated for stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium
• Compact insert geometry: 0.38 inches height, 1.5 inches width, 1.5 inches length

Compatibility

Designed for use with ALLIED MACHINE AND ENGINEERING GEN2 T-A series spade drill holders accepting Seat Size 1 inserts. Verify holder seat size and insert diameter before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before changing inserts. Use the appropriate torx or hex key as specified by the holder manufacturer to secure the insert clamp screw to the correct torque per the holder documentation. Inspect the holder seat for chips or debris before seating the insert to ensure proper contact and runout.