Allied Machine 131T-0028 Spade Drill Insert 7/8 in Hss Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 131T-0028 is a spade drill insert designed for high-productivity drilling in a wide range of metalworking applications. Measuring 7/8 inches in diameter with a 132-degree point angle, this insert is manufactured from M4 grade high speed steel and finished with a TiN (titanium nitride) PVD coating. The TiN coating increases surface hardness and reduces friction, extending tool life between regrinds. The insert fits Seat Size 1 holders in the T-A spade drill series. It is specified by machinists and toolroom technicians working in production drilling environments.

This insert is suited for drilling steel, cast iron, and non-ferrous metals, covering primary workpiece material codes P, K, and N. The T-A series is a common platform in production machining cells, job shops, and maintenance machining environments where indexable spade tooling is used in place of conventional twist drills for deeper or larger-diameter holes. The 132-degree point geometry suits flat-bottomed and through-hole drilling in the listed workpiece materials.

Key Features

• 7/8 inches diameter with 132-degree point angle for accurate entry and chip formation
• M4 grade high speed steel substrate for toughness in interrupted and continuous cuts
• TiN PVD coating improves surface hardness and reduces built-up edge on the cutting face
• Seat Size 1 interface fits standard T-A series spade drill holders
• Fractional inch measurement system for direct compatibility with inch-standard tooling setups
• Rated for steel, cast iron, and non-ferrous metal workpieces

Compatibility

Designed for use with T-A series Seat Size 1 spade drill holders. Compatible with primary workpiece materials steel (P), cast iron (K), and non-ferrous metals (N) as specified by the manufacturer.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. The machine spindle must be fully stopped and the tool holder secured in the spindle or turret before seating or removing the insert. Ensure the insert seat and clamping surfaces are clean and free of chips before assembly. Follow the machine tool manufacturer and holder manufacturer torque recommendations for the clamping screw — do not overtorque, as this can crack the insert or deform the seat.