Allied Machine 151T-0025 Spade Drill Insert 25/32 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 151T-0025 is a spade drill insert designed for high-performance hole-making in a wide range of metalworking applications. Measuring 25/32 inches in diameter with a 132-degree point angle, this insert is manufactured from T15 cobalt high-speed steel and features a TiN (titanium nitride) PVD coating for extended tool life and reduced friction. It is sized for a Seat Size 1 holder and belongs to the T-A series, a widely used platform in production drilling environments. Machinists, tool-and-die makers, and CNC operators install this insert as a replaceable cutting element in compatible T-A series spade drill bodies.

This insert is suited for drilling steel, stainless steel, cast iron, superalloys, and titanium — covering ISO material groups P, M, K, and S. It is a common choice in job shops and production facilities where a single insert platform must handle diverse workpiece materials. The fractional inch sizing fits standard imperial-specification T-A series holders, making it straightforward to incorporate into existing setups without toolholder changes.

Key Features

• 25/32 inch diameter with 132-degree point angle for positive cutting entry and minimal thrust
• T15 cobalt high-speed steel substrate provides toughness and heat resistance in interrupted and continuous cuts
• TiN PVD coating reduces built-up edge and extends insert service life across multiple regrind cycles
• Seat Size 1 fits standard T-A series spade drill bodies without modification
• Rated for primary workpiece materials including steel, stainless steel, cast iron, superalloys, and titanium
• Fractional inch system sizing for compatibility with imperial-specification tooling setups

Compatibility

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

Installation Notes

Installation is performed by machinists or toolroom personnel. Before seating the insert, ensure the drill body pocket and clamping surfaces are clean and free of chips or debris, as contamination will cause insert misalignment and premature failure. Use the correct torque wrench and insert screw specified by the toolholder manufacturer — do not overtighten, as this can crack the insert. Verify insert seating and runout before beginning the cut.