Allied Machine 18ZT-.453 Spade Drill Insert 29/64 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 18ZT-.453 is a cobalt spade drill insert designed for high-performance hole-making in demanding machining applications. Engineered to seat size Z in the T-A series system, this insert features a 132-degree point angle and a TiN (titanium nitride) PVD coating that extends tool life and reduces friction at the cutting edge. At 0.0938 inches thick and producing a 29/64-inch diameter bore, it delivers precise, consistent results across a range of workpiece materials. Machinists and toolroom professionals select this insert when drilling conditions demand a durable, coated cobalt cutting edge.

This insert is suited for drilling operations on steel, stainless steel, cast iron, super-alloys, titanium, and hard materials. It fits directly into compatible T-A series spade drill holders using seat size Z, making it a direct drop-in for production and job-shop environments alike. The cobalt substrate provides added heat and wear resistance compared to standard high-speed steel, making it particularly well-suited for harder or more abrasive workpiece materials where cutting temperatures run elevated.

Key Features

• 29/64-inch diameter cutting edge for precise bore sizing
• Cobalt insert material for superior hardness and heat resistance
• TiN PVD coating reduces friction and extends insert life
• 132-degree point angle for aggressive, efficient entry
• Seat size Z, T-A series compatibility for direct holder fitment
• 0.0938-inch insert thickness for stable seating and rigidity

Compatibility

Designed for use with T-A series spade drill holders accepting seat size Z. Compatible with workpiece materials classified as steel, stainless steel, cast iron, super-alloys, titanium, and hard materials (ISO material codes P, M, K, S, and H).

Installation Notes

This insert is installed and serviced by machinists or toolroom technicians familiar with indexable spade drill systems. Ensure the holder and seat are clean and free of chips or debris before seating the insert, as contamination can cause misalignment and premature failure. Use the correct torque driver or wrench specified by the holder manufacturer when securing the insert screw. Do not exceed recommended feed and speed parameters for the workpiece material being drilled.