Allied Machine 438T-0402 Spade Drill Insert 4-1/16 in Hss Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 438T-0402 is a spade drill insert designed for high-speed steel drilling applications across steel, cast iron, and non-ferrous metal workpieces. Part of the GEN2 T-A series, this insert measures 4-1/16 inches in diameter with a 144-degree point angle and a 0.4375-inch thickness. It is finished with a TiN (titanium nitride) PVD coating that extends cutting edge life in production drilling environments. The insert fits a Seat Size 8 holder and is manufactured from M4-grade high speed steel, making it a capable choice for shops running high-volume or interrupted-cut drilling operations.

This insert is suited for use in machining centers, drill presses, and CNC turning centers where large-diameter hole-making is required. The GEN2 T-A series is engineered for use in steel, cast iron, and non-ferrous metal workpieces. Typical applications include manufacturing, heavy fabrication, and production machining environments where consistent hole quality and tool life are critical. The insert mounts into a compatible Seat Size 8 T-A style holder, which must be sourced separately.

Key Features

• 4-1/16 inch cutting diameter suitable for large-bore drilling applications
• 144-degree point angle for efficient chip formation across multiple workpiece materials
• M4-grade high speed steel construction provides toughness in interrupted cuts
• TiN PVD coating reduces friction and extends cutting tool life
• GEN2 T-A series design for use with compatible Seat Size 8 holders
• Compatible with steel, cast iron, and non-ferrous metal primary workpiece materials

Compatibility

Designed for use with Seat Size 8 T-A series spade drill holders. Compatible primary workpiece materials include steel (P), cast iron (K), and non-ferrous metal (N) as specified by the manufacturer. Verify holder seat size and series compatibility before installation.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and machine power is locked out before inserting or removing the insert from the holder. Inspect the insert seat and clamping screw for wear or damage prior to mounting. Follow the holder manufacturer's torque and clamping specifications for the Seat Size 8 holder.