Allied Machine 155T-0300 Spade Drill Insert 3in Cobalt Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 155T-0300 is a cobalt spade drill insert designed for high-performance drilling in demanding metalworking applications. Part of the T-A series, this insert measures 3 inches in diameter and fits a Seat Size 5 holder. It features a 144-degree point angle and a TiN (titanium nitride) PVD coating that extends tool life by reducing friction and heat buildup at the cutting edge. At 0.4 pounds, it is compact and precisely dimensioned at 2.48 inches in length, 3.74 inches in width, and 0.47 inches in height. This insert is intended for use by machinists and tooling professionals working with production drilling setups.

The 155T-0300 is suited for drilling steel, stainless steel, cast iron, super-alloys, and titanium workpieces, corresponding to ISO material groups P, M, K, and S. It is a direct replacement insert for T-A series spade drill holders with a Seat Size 5 bore. Typical applications include production drilling on CNC lathes, machining centers, and manual drill presses where spade drill tooling is specified for large-diameter holes without the weight and cost of a solid carbide drill.

Key Features

• 3-inch diameter cutting edge for large-bore drilling applications
• 144-degree point angle optimized for chip control and centering on entry
• Cobalt substrate provides toughness and heat resistance in interrupted cuts
• TiN PVD coating reduces friction and extends tool life across multiple material types
• T-A series Seat Size 5 interface ensures secure, repeatable seating in compatible holders
• Rated for steel, stainless steel, cast iron, super-alloys, and titanium workpieces

Compatibility

Designed as a replacement insert for T-A series spade drill holders requiring a Seat Size 5 insert with a 3-inch diameter. Compatible with workpiece materials classified under ISO groups P (steel), M (stainless steel), K (cast iron), and S (super-alloys and titanium).

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before seating or removing the insert. Ensure the holder pocket and clamping screw are clean and free of chips before installing the insert to achieve proper seating and runout. Follow the toolholder manufacturer's clamping torque specifications for Seat Size 5 inserts as documented in the holder documentation.