Allied Machine 4C21P-20 Spade Drill Insert 20mm Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 4C21P-20 is a solid carbide spade drill insert designed for high-performance hole-making in demanding machining applications. Sized at 20 mm in diameter with a 132-degree point angle, this insert fits a Seat Size 1 holder and is manufactured to the GEN2 T-A series standard. The insert carries an AM300 PVD coating and is graded C2 (K20), making it well-suited for operations where tool life and cutting edge integrity are critical. A thickness of 0.1563 inches supports rigidity at depth. Machinists and toolroom professionals working in production environments will find this insert a direct replacement for worn or damaged GEN2 T-A tooling.

This insert is engineered for use across a range of primary workpiece materials including stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium. It is intended for use in the GEN2 T-A spade drill system, a modular insert-style drilling platform common in production machining, job shop work, and aerospace component manufacturing. The 132-degree point geometry reduces thrust and improves chip formation on harder and more abrasive materials. This makes it a practical choice for shops running difficult-to-machine alloys on CNC lathes, machining centers, or drill presses equipped with compatible T-A style holders.

Key Features

• Solid carbide construction in manufacturer grade C2 (K20) for wear resistance in hard and abrasive materials
• AM300 PVD coating provides thermal protection and extended tool life on stainless steel, titanium, and super-alloys
• 132-degree point angle reduces axial thrust and improves chip control
• 20 mm cutting diameter in a Seat Size 1 format for use in GEN2 T-A compatible holders
• Insert thickness of 0.1563 inches maintains stability during deep-hole drilling cycles
• Rated for stainless steel, cast iron, non-ferrous metal, super-alloys, and titanium workpiece materials

Compatibility

Designed for use with GEN2 T-A series Seat Size 1 spade drill holders. Compatible with primary workpiece materials coded M (stainless steel), K (cast iron), N (non-ferrous metal), and S (super-alloys and titanium).

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before inserting or removing the spade drill insert, ensure the machine spindle is fully stopped, locked out, and all stored energy is released per applicable LOTO procedures. Seat the insert fully into the holder pocket and verify proper clamping torque using the holder manufacturer's documentation. Inspect the insert seat and clamping surfaces for chips or debris before each use to prevent premature insert failure or inaccurate hole geometry.