Allied Machine 181T-.921 Spade Drill Insert 59/64 in Cobalt

Product Description

The ALLIED MACHINE AND ENGINEERING 181T-.921 is a spade drill insert designed for high-performance drilling operations across a range of ferrous and hard materials. Part of the T-A Series, this insert measures 59/64 inches in diameter and seats into a Size 1 holder. It is manufactured from cobalt high-speed steel and features a PVD-applied TiN (titanium nitride) coating that extends tool life and reduces friction at the cutting edge. The 132-degree point angle makes it well suited for drilling into materials that require aggressive entry geometry. Installation is performed by machinists and tool-room technicians using compatible T-A Series spade drill holders.

This insert is used in production machining environments where consistent hole quality and tool longevity are required. It performs across a broad range of primary workpiece materials including steel, stainless steel, cast iron, super-alloys, titanium, and hard materials. The T-A Series system is a common platform in both manual and CNC drilling applications, making this insert a versatile choice for job shops, production floors, and maintenance machining.

Key Features

• 59/64 inch diameter with Size 1 seat for direct use in T-A Series holders
• Cobalt substrate provides heat and wear resistance beyond standard high-speed steel
• TiN PVD coating reduces cutting friction and extends insert service intervals
• 132-degree point angle optimized for entry into steel, stainless, cast iron, super-alloys, titanium, and hard materials
• Insert thickness of 0.1563 inches for precise seating and repeatability
• Sold individually — minimum order quantity of 1

Compatibility

Designed for use with Allied Machine and Engineering T-A Series spade drill holders accepting a Size 1 seat. Compatible workpiece materials include steel (P), stainless steel (M), cast iron (K), super-alloys and titanium (S), and hard materials (H) per standard ISO material classification codes.

Installation Notes

This insert is installed and replaced by machinists or tool-room personnel following the holder manufacturer torque and seating procedures for the T-A Series platform. Ensure the machine spindle is fully stopped and locked out before changing inserts. Inspect the seat and clamping screw for wear or debris before seating a new insert. Use only the manufacturer-specified clamping hardware to avoid insert rocking or premature failure.