Allied 1C21T-0025 Spade Drill Insert 25/32 in Carbide Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21T-0025 is a spade drill insert designed for high-performance hole-making in demanding industrial and machining applications. It measures 25/32 inches in diameter and seats in a Size 1 holder. The insert is manufactured from C2 (K20) grade carbide and features a 132-degree point angle suited for controlled entry and clean breakthrough. A TiN (titanium nitride) PVD coating is applied to extend tool life and reduce built-up edge when cutting through difficult materials. Thickness is 0.1563 inches. This insert is part of the T-A series, a widely used spade drill platform in production machining environments.

This insert is intended for use in CNC machining centers, drill presses, and turning centers where spade-style drilling is performed. Primary workpiece materials include stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is suited to both job shops and high-volume production settings where insert replacement speed and consistent hole geometry are priorities. Machinists and tooling specialists working in aerospace, automotive, oil and gas, and general metalworking will find this insert appropriate for their material grades and cutting conditions.

Key Features

• 25/32 inch diameter, Seat Size 1 — compatible with standard T-A series spade drill holders
• C2 (K20) carbide grade — suitable for cast iron, non-ferrous metals, and difficult alloys
• 132-degree point angle — promotes accurate entry and reduces thrust on breakthrough
• TiN PVD coating — improves wear resistance and surface finish across varied workpiece materials
• Fractional inch measurement system — integrates directly into standard inch-based tooling setups
• Single-piece package quantity — allows precise inventory control and tooling cost tracking

Compatibility

Designed for use with T-A series Seat Size 1 spade drill holders. Compatible with primary workpiece materials rated M (stainless steel), K (cast iron), N (non-ferrous metal), and S (superalloys and titanium) per ISO material classification.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. The machine spindle must be fully stopped and locked out before seating or removing the insert. Verify that the holder seat is clean and free of chips or debris before inserting, as contamination affects seating geometry and drill runout. Follow the holder manufacturer's torque and clamping specifications for Seat Size 1 inserts — do not over-torque the clamping screw.