Allied Machine 1C21A-0028 Spade Drill Insert 7/8 in Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21A-0028 is a solid carbide spade drill insert designed for high-performance hole-making in demanding machining applications. Measuring 7/8 inch in diameter with a 132-degree point angle and a thickness of 0.1563 inches, this insert seats into a Series T-A Seat Size 1 holder. The TiAlN PVD coating provides thermal resistance and extended tool life when cutting hard or abrasive materials. Manufactured to grade C2 (K20), it is suited for precision drilling where tool rigidity and edge retention are critical. Machinists and tooling specialists working in production or job-shop environments will find this insert a reliable replacement or spare for active T-A tooling programs.

The 1C21A-0028 is rated for use on stainless steel, cast iron, non-ferrous metals, and super-alloys including titanium. These material groups cover a broad range of industrial and aerospace workpiece applications. The insert is compatible with Series T-A spade drill holders accepting Seat Size 1, making it appropriate for CNC machining centers, lathes with live tooling, and manual drill press setups where T-A tooling is already in service. It is commonly used in production runs requiring consistent hole geometry across multiple workpieces.

Key Features

• Solid carbide construction at grade C2 (K20) for rigidity and wear resistance
• TiAlN PVD coating for heat resistance and extended tool life in ferrous and exotic materials
• 132-degree point angle optimized for a wide range of workpiece materials
• 7/8 inch diameter with 0.1563 inch thickness for Seat Size 1 T-A holders
• Rated for stainless steel, cast iron, non-ferrous metals, and super-alloys including titanium

Compatibility

Designed for use with Series T-A spade drill holders accepting Seat Size 1. Compatible primary workpiece materials include stainless steel, cast iron, non-ferrous metals, and super-alloys and titanium (material codes M, K, N, S).

Installation Notes

This insert is installed and replaced by machinists or tooling technicians on CNC or manual drilling equipment. Shut down and lock out the spindle before seating or removing the insert. Ensure the holder seat is clean and free of chips before installation to maintain proper seating and concentricity. Follow the T-A holder manufacturer torque guidance for the insert clamping screw.