Allied Machine 1C51A-.859 Spade Drill Insert 55/64 in Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING 1C51A-.859 is a solid carbide spade drill insert designed for high-performance drilling in steel and hard materials. Measuring 55/64 inches in diameter with a 132-degree point angle, this insert seats into a Size 1 T-A series holder for repeatable, rigid tool engagement. The TiAlN PVD coating provides heat resistance and extended tool life in demanding cutting applications. At 0.1 pounds, this insert is a lightweight but highly engineered cutting tool used by machinists and tool-and-die professionals in production drilling environments.

This insert is suited for drilling operations in ferrous metals, including steel and hard materials classified under ISO material grades P and H. It is used in CNC machining centers, drill presses, and manual boring operations where consistent hole geometry and surface finish are required. The T-A series is a common platform in production shops running moderate to high cutting speeds where insert changeability reduces machine downtime.

Key Features

• 55/64 inch diameter with 132-degree point angle for accurate entry and chip formation in steel
• Solid carbide construction at manufacturer grade C5 (P40) for rigidity and wear resistance
• TiAlN PVD coating extends tool life in high-heat cutting conditions
• Seats into Size 1 T-A series holders for secure, repeatable insert indexing
• Thickness of 0.1563 inches ensures consistent seating depth across holder platforms
• Rated for steel and hard material workpieces under ISO P and H material classifications

Compatibility

Designed for use with Size 1 T-A series spade drill holders. Compatible with primary workpiece materials classified as steel and hard materials per ISO material grade codes P and H.

Installation Notes

Installation should be performed by a qualified machinist following the tool holder manufacturer torque and seating guidelines. Ensure the machine spindle is fully powered down and locked out before indexing or replacing inserts. Inspect the holder seat for chips or debris before seating the insert to prevent misalignment and premature insert failure. Always verify insert orientation and secure fastening before resuming cutting operations.