Allied Machine 151T-.890 Spade Drill Insert 57/64 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 151T-.890 is a spade drill insert designed for high-performance drilling in demanding metalworking applications. Built from cobalt high-speed steel and finished with a TiN (titanium nitride) PVD coating, this insert delivers extended tool life and resistance to heat buildup at the cutting edge. It measures 57/64 inches in diameter with a 132-degree point angle and fits Seat Size 1 holders in the T-A series system. The 0.1563-inch thickness provides consistent seating and rigidity during cutting operations. Machinists and tooling technicians working in production or job-shop environments rely on this insert for reliable, repeatable hole quality in tough materials.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, and titanium — covering ISO material codes P, M, K, and S. The T-A series spade drill system is a common choice in both manual and CNC machining setups where replaceable inserts reduce downtime compared to solid-body drills. Typical applications include through-hole and blind-hole drilling in structural components, flanges, and machined housings across aerospace, energy, and general manufacturing environments.

Key Features

• 57/64 inches cutting diameter with 132-degree point angle for aggressive chip formation and self-centering entry
• Cobalt substrate provides higher heat and wear resistance compared to standard M2 high-speed steel
• TiN PVD coating reduces friction and extends insert life in abrasive workpiece materials
• Seat Size 1 compatibility fits standard T-A series spade drill holders
• 0.1563-inch insert thickness ensures stable, repeatable seating in the holder pocket
• Rated for steel, stainless steel, cast iron, super-alloys, and titanium workpiece materials

Compatibility

Designed for use with T-A series Seat Size 1 spade drill holders. Compatible with workpiece materials including steel, stainless steel, cast iron, super-alloys, and titanium (ISO material codes P, M, K, and S).

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the spindle before seating or removing any insert. Ensure the holder pocket is clean and free of chips or debris before installing the insert to achieve proper seating and prevent runout. Follow the holder manufacturer torque guidelines for the clamping screw — do not over-torque, as this can distort the insert or damage the pocket.