Allied Machine 181T-.734 Spade Drill Insert 47/64 in Cobalt Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 181T-.734 is a cobalt spade drill insert designed for high-performance drilling in demanding metal-cutting applications. Measuring 47/64 inches in diameter with a 132-degree point angle, this insert delivers stable entry geometry and consistent hole quality. The PVD-applied TiN (titanium nitride) coating reduces friction and extends cutting life in abrasive workpiece materials. At 0.1563 inches thick and weighing 0.1 pounds, it seats into Size 1 T-A series holders. Licensed machinists, toolroom technicians, and CNC operators typically specify this insert for production drilling in steel and other hard materials.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, titanium, and hard materials — covering ISO workpiece material codes P, M, K, S, and H. It is used in both job shop and production environments where a replaceable spade drill system reduces tooling cost versus solid carbide drills. The T-A series platform is a common spade drill system used on manual drill presses, CNC machining centers, and lathes equipped with live tooling.

Key Features

• 47/64-inch cutting diameter for close-tolerance hole sizing
• 132-degree point angle for controlled entry and reduced thrust on entry
• Cobalt substrate provides toughness and heat resistance in interrupted cuts
• PVD TiN coating extends tool life and reduces built-up edge in ferrous materials
• 0.1563-inch insert thickness ensures rigid seating in Size 1 T-A holders
• Rated for steel, stainless steel, cast iron, super-alloys, titanium, and hard materials

Compatibility

Designed for use with Size 1 T-A series spade drill holders. Consult the T-A series holder selection guide to confirm shank size and holder body compatibility before installation.

Installation Notes

A qualified machinist or toolroom technician should install this insert using the appropriate T-A series insert screw and torque driver — refer to the holder manufacturer's seating procedure. Power down and lock out the machine spindle before changing inserts. Inspect the holder pocket and locating surfaces for chips or wear before seating the new insert. Do not use damaged holders, as improper seating can cause insert breakage or dimensional error.