Allied Machine 4C2YP-.421 Spade Drill Insert 27/64 in

Product Description

The ALLIED MACHINE AND ENGINEERING 4C2YP-.421 is a solid carbide spade drill insert designed for high-performance drilling in demanding industrial applications. Part of the GEN2 T-A series, this insert features a 132-degree point angle and an AM300 PVD coating that extends tool life and maintains cutting edge integrity across a range of difficult workpiece materials. At 0.421 inches in diameter with a Seat Size Y designation, it is engineered to seat precisely in compatible T-A spade drill holders. Machinists, toolroom technicians, and CNC operators install this insert when drilling operations require consistent performance in tough materials.

This insert is suited for drilling stainless steel, cast iron, non-ferrous metals, and super-alloys including titanium. It is designed for production and job-shop environments where material grades M, K, N, and S are commonly encountered. The GEN2 T-A platform is widely used in horizontal and vertical machining centers as well as manual drilling setups requiring replaceable insert tooling.

Key Features

• 27/64 inch (0.421 inch) diameter with Seat Size Y for precise holder fit
• 132-degree point angle optimized for controlled entry and reduced thrust
• Solid carbide construction at manufacturer grade C2 (K20) for rigidity and wear resistance
• AM300 PVD coating extends cutting tool life in abrasive and work-hardening materials
• Compatible primary workpiece materials include stainless steel, cast iron, non-ferrous metals, and super-alloys and titanium
• GEN2 T-A series design for repeatable insert indexing and seating

Compatibility

Designed for use with GEN2 T-A series spade drill holders accepting Seat Size Y inserts at 27/64 inch diameter. Consult Allied Machine and Engineering tooling documentation to confirm holder compatibility before ordering.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or toolroom technician with the machine fully powered down and secured against accidental startup. Use the correct T-A insert seating tool or torque wrench as specified by the holder manufacturer to avoid over-torquing the insert screw. Inspect the holder seat for chips, debris, or wear before installing a new insert. Follow all applicable shop safety procedures and machine tool manufacturer guidelines during tooling changes.