Allied Machine 1C21A-0025 Spade Drill Insert 25/32 in Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21A-0025 is a solid carbide spade drill insert designed for precision hole-making in demanding materials. Part of the T-A series, this insert measures 25/32 inches in diameter with a 132-degree point angle and a Seat Size 1 profile. The TiAlN PVD coating provides thermal resistance and extended tool life when cutting at elevated speeds. At 0.1563 inches thick and weighing 0.1 pounds, it is engineered for use in T-A series spade drill bodies by machinists and toolroom professionals working in production and job-shop environments.

This insert is suited for drilling stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium. It carries a C2 (K20) carbide grade, making it appropriate for both interrupted and continuous cutting conditions across these material groups. Typical applications include through-hole and blind-hole drilling in aerospace, automotive, and general metalworking operations where consistent bore quality and insert repeatability are required.

Key Features

• Solid carbide construction at C2 (K20) grade for hardness and wear resistance
• TiAlN PVD coating for high-temperature performance and reduced built-up edge
• 132-degree point angle optimized for a broad range of workpiece materials
• 25/32 inch diameter with Seat Size 1 for direct T-A series body compatibility
• 0.1563 inch insert thickness for consistent seating and repeatable geometry
• Rated for stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium

Compatibility

Designed for use with T-A series Seat Size 1 spade drill bodies accepting a 25/32 inch diameter insert. Compatible workpiece material codes include M (stainless steel), K (cast iron), N (non-ferrous metal), and S (super-alloys and titanium).

Installation Notes

Insert seating and torque should be performed by a qualified machinist following the toolholder manufacturer's published specifications. Power down and lock out the machine spindle before changing or inspecting inserts. Inspect the insert seat for chips or debris before installation to ensure proper contact and prevent premature insert failure. Handle solid carbide inserts carefully to avoid chipping the cutting edge.