Allied 1C21A-.765 Spade Drill Insert 49/64in Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21A-.765 is a solid carbide spade drill insert designed for high-performance drilling in demanding industrial applications. Part of the T-A Series, this insert features a 49/64-inch diameter, a 132-degree point angle, and a TiAlN (titanium aluminum nitride) PVD coating that extends tool life in high-heat cutting conditions. Manufactured to Manufacturer Grade C2 (K20), it delivers the hardness and wear resistance required for precision hole-making in difficult materials. Machinists and tooling technicians install this insert into compatible T-A Series spade drill holders as a replaceable cutting element.

This insert is intended for use in CNC machining centers, drill presses, and lathe applications where consistent bore quality and tool longevity are priorities. It is rated for primary workpiece materials including stainless steel, cast iron, non-ferrous metals, and super-alloys and titanium, covering ISO material codes M, K, N, and S. It suits production-volume drilling operations in aerospace, automotive, and general manufacturing environments where spade drill tooling is preferred for its economy and repeatability.

Key Features

• 49/64-inch cutting diameter with Seat Size 1 for T-A Series holder compatibility
• 132-degree point angle for self-centering entry and reduced thrust in hard materials
• Solid carbide substrate at Manufacturer Grade C2 (K20) for high hardness and abrasion resistance
• TiAlN PVD coating improves heat resistance and extends tool life in stainless steel and super-alloys
• Rated for ISO material codes M, K, N, and S — stainless steel, cast iron, non-ferrous, and titanium alloys
• Replaceable insert design reduces tooling cost compared to solid drill replacement

Compatibility

Designed for use with T-A Series Seat Size 1 spade drill holders. Consult the Allied Machine and Engineering T-A Series holder selection guide to confirm shank and seat compatibility before installation.

Installation Notes

This insert is installed and replaced by machinists or tooling technicians familiar with indexable spade drill systems. Ensure the machine spindle is fully stopped and locked out before seating or removing the insert. Use the correct T-A Series insert screw and torque it with the appropriate driver to manufacturer specifications provided with the holder. Inspect the insert seat for chips or debris before each installation to maintain proper seating and runout.