Allied Machine 1C21T-21 Spade Drill Insert 21mm Carbide Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21T-21 is a solid carbide spade drill insert designed for high-performance hole-making in demanding machining applications. Part of the T-A series, this insert seats into Size 1 spade drill holders and features a 132-degree point angle optimized for controlled entry and chip formation. The insert carries a TiN (titanium nitride) PVD coating applied through physical vapor deposition, which extends tool life and reduces built-up edge when cutting abrasive or work-hardening materials. At 0.1563 inches thick and a nominal 21 mm cutting diameter, it fits within a compact, repeatable format suited for production-volume drilling.

This insert is intended for use in metal-cutting environments where stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium are the primary workpiece materials — material codes M, K, N, and S respectively. The T-A series spade drill system is a common choice in job shops and production facilities running CNC machining centers, lathes with driven tooling, or dedicated drilling machines. The insert replacement design allows holders to be reused while only the cutting element is swapped out, reducing per-hole tooling cost in high-volume runs. Minimum order quantity is 2 inserts; each package contains 1.

Key Features

• Solid carbide construction with C2 (K20) manufacturer grade for hardness and wear resistance
• TiN PVD coating reduces friction and extends tool life in abrasive materials
• 132-degree point angle for controlled drill entry and reduced thrust force
• 21 mm cutting diameter in a Size 1 seat format for T-A series holders
• Rated for stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium
• Replaceable insert design allows holder reuse and lowers per-hole tooling cost

Compatibility

Designed for use with T-A series Size 1 spade drill holders. Compatible workpiece materials include stainless steel (M), cast iron (K), non-ferrous metals (N), and super-alloys and titanium (S) per ISO material classification codes.

Installation Notes

Insert seating and clamping should be performed by a machinist or tooling technician following the holder manufacturer torque and seating procedure. Ensure the holder pocket and insert seat are clean and free of chips before seating the insert to prevent improper seating or insert rocking. Machine spindle must be fully stopped and locked out before any insert change. Verify insert is fully seated and clamped per the holder specification before resuming cutting operations.