Allied Machine 1C21A-0024 Spade Drill Insert 0.75in Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21A-0024 is a solid carbide spade drill insert designed for high-performance drilling in demanding industrial applications. Manufactured to Seat Size 1 in the T-A series, this insert measures 0.75 inches in diameter and features a 132-degree point angle for accurate entry and controlled chip formation. The insert carries a TiAlN (titanium aluminum nitride) PVD coating and is graded C2 (K20 equivalent), providing elevated hardness and heat resistance during aggressive drilling cycles. Licensed machinists and tool-and-die professionals install this insert into compatible T-A series spade drill holders to replace worn or damaged cutting edges without discarding the entire drill body.

This insert is suited for production drilling of stainless steel, cast iron, non-ferrous metals, superalloys, and titanium — workpiece material codes M, K, N, and S. Typical applications include CNC machining centers, manual drill presses, and automated transfer lines where repeatable hole quality and insert-indexability reduce downtime. The 0.75-inch diameter makes it a common choice for medium-bore hole operations across aerospace, automotive, and general metalworking environments.

Key Features

• Solid carbide construction with C2 (K20) material grade for high wear resistance
• TiAlN PVD coating extends tool life in high-temperature cutting conditions
• 132-degree point angle for stable, accurate hole entry
• Seat Size 1, T-A series design for drop-in holder compatibility
• Rated for stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Insert-style design allows cutting-edge replacement without discarding the drill holder

Compatibility

Designed for use with Allied Machine and Engineering T-A series Seat Size 1 spade drill holders. Verify holder seat size and series designation before installation.

Installation Notes

Installation should be performed by qualified machinists or tooling technicians familiar with indexable spade drill systems. Ensure the machine spindle is fully powered down and locked out before changing inserts. Seat the insert firmly and evenly into the holder pocket and secure with the appropriate fastener to the holder manufacturer torque specification. Inspect the holder seat for wear or damage before installing a new insert to maintain concentricity and hole quality.