Allied Machine 18ZT-.484 Spade Drill Insert 31/64 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 18ZT-.484 is a cobalt spade drill insert designed for high-performance drilling in demanding industrial applications. Measuring 31/64 inch in diameter with a 132-degree point angle, this insert fits Seat Size Z toolholders in the T-A series system. The TiN (titanium nitride) PVD coating reduces friction and increases surface hardness, extending tool life in production drilling environments. At 0.0938 inches thick, it delivers consistent cutting geometry across repeated use. Licensed machinists and toolroom technicians typically specify this insert for precision boring and drilling operations on production equipment.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, titanium, and hard materials, covering ISO material codes P, M, K, S, and H. It is appropriate for use in CNC machining centers, drill presses, and turning centers wherever the T-A spade drill system is already in use. The 132-degree point angle is well suited for harder workpiece materials where a more acute cutting geometry would cause premature edge failure or deflection.

Key Features

• 31/64 inch diameter with 132-degree point angle for aggressive penetration in hard materials
• Cobalt substrate provides elevated heat and wear resistance compared to standard HSS
• TiN PVD coating reduces friction and extends cutting edge life
• Seat Size Z for direct compatibility with T-A series spade drill bodies
• 0.0938 inch insert thickness supports stable seating and repeatable runout
• Rated for steel, stainless steel, cast iron, super-alloys, titanium, and hard materials

Compatibility

Designed for use with T-A series spade drill holders accepting Seat Size Z inserts. Compatible primary workpiece materials include steel, stainless steel, cast iron, super-alloys, titanium, and hard materials (ISO codes P, M, K, S, H).

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine fully powered down and the spindle locked before changing inserts. Seat the insert firmly against the holder pocket and verify clamping screw torque using the toolholder manufacturer's documented procedure. Inspect the seat and clamping surfaces for chips or debris before each insert change to maintain proper seating and prevent runout. Follow applicable shop safety standards and machine tool manufacturer guidelines during all tooling changes.