Allied Machine 131T-.859 Spade Drill Insert 55/64 in Hss Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 131T-.859 is a spade drill insert designed for high-throughput hole-making operations in industrial and production machining environments. Built from M4 grade High Speed Steel with a Physical Vapor Deposition (PVD) TiN coating, this insert delivers increased surface hardness and extended tool life compared to uncoated alternatives. It measures 55/64 inches in diameter and seats in a Size 1 holder, with a 132-degree point angle optimized for controlled entry and reduced thrust in a range of workpiece materials. Installation is performed by qualified machinists and toolroom technicians.

This spade drill insert is suited for drilling operations in steel, cast iron, and non-ferrous metals, covering workpiece material codes P, K, and N. It fits the T-A Series spade drill system, which uses interchangeable inserts and dedicated blade holders to allow fast insert changes without removing the holder from the spindle. Typical applications include production drilling on CNC machining centers, turret lathes, and drill presses where high metal removal rates and consistent hole quality are required.

Key Features

• M4 High Speed Steel construction for toughness in interrupted cuts and variable feed conditions
• TiN PVD coating increases surface hardness and reduces friction for longer insert life
• 132-degree point angle provides aggressive cutting geometry suited for steel and cast iron entry
• 55/64 inch diameter fits Size 1 T-A Series blade holders for fast field replacement
• Compatible with steel, cast iron, and non-ferrous metal workpieces in a single insert grade
• 0.1563 inch insert thickness maintains consistent seating and repeatable depth control

Compatibility

Designed for use with T-A Series Size 1 spade drill blade holders. Compatible with primary workpiece materials including steel (P), cast iron (K), and non-ferrous metals (N).

Installation Notes

Spade drill inserts are installed and replaced by machinists or toolroom technicians following the blade holder manufacturer torque and clamping procedures for the T-A Series system. Always disengage the spindle and confirm the machine is in a safe, locked-out state before handling or replacing inserts. Inspect the blade pocket and seating surfaces for chips or wear before installing a new insert. Follow all applicable shop safety and machine guarding requirements during setup.