Allied Machine 155T-0216 Spade Drill Insert 2.5 in Cobalt Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 155T-0216 is a cobalt spade drill insert designed for high-feed drilling operations in demanding metal-cutting applications. Part of the T-A Series, this insert measures 2-1/2 inches in diameter with a 144-degree point angle and carries a Physical Vapor Deposition (PVD) titanium nitride (TiN) coating for extended tool life and reduced built-up edge. At 0.4375 inches thick and weighing 0.4 pounds, it seats in a Size 5 T-A Series holder. Machinists and tool-and-die professionals install this insert as a direct replacement in production drilling setups where consistent hole geometry and tool durability are critical.

This insert is suited for drilling steel, stainless steel, cast iron, super-alloys, and titanium, covering ISO material groups P, M, K, and S. It fits standard T-A Series Size 5 spade drill holders and is appropriate for both manual machining centers and CNC applications where replaceable-insert spade drills are the preferred tooling strategy. Typical use cases include production-volume hole-making where indexable inserts reduce downtime compared to regrinding solid drills.

Key Features

• 2-1/2 inch diameter with a 144-degree point angle for controlled entry and reduced thrust
• Cobalt substrate provides heat and wear resistance beyond standard HSS
• PVD TiN coating reduces friction and extends cutting edge life
• Size 5 seat fits T-A Series spade drill holders for quick insert changes
• Compatible with steel, stainless steel, cast iron, super-alloys, and titanium workpieces
• Thickness of 0.4375 inches ensures proper seating and rigidity in the holder

Compatibility

Designed for use with T-A Series Size 5 spade drill holders. Compatible primary workpiece materials include steel, stainless steel, cast iron, super-alloys, and titanium (ISO material groups P, M, K, and S).

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before removing or installing the insert. Seat the insert firmly in the Size 5 holder pocket and confirm all clamping screws are torqued per the holder manufacturer specifications before beginning any cut. Inspect the insert seating surface for chips or debris prior to each use to maintain concentricity and safe operation.