Allied Machine 21411-0004 Indexable Spade Drill Taper Shank

Product Description

The ALLIED MACHINE AND ENGINEERING 21411-0004 is an indexable spade drill designed for high-performance drilling in a wide range of workpiece materials. Built to Series HP-A standards, it accepts interchangeable spade drill inserts and delivers consistent hole quality across multiple drilling cycles. The drill body features a straight flute geometry and a 4MT taper shank with a shank diameter of 1.231 inches, providing rigid, accurate positioning in compatible taper-socket spindles. With a maximum drill depth of 3 inches and an overall length of 7-7/8 inches, this tool is sized for short-reach applications on lathes, drill presses, and machining centers. Installation and operation are performed by machining professionals in production and job-shop environments.

This drill body covers a diameter range of 31/32 inches to 1-3/8 inches, making it suitable for a broad set of general-purpose and production drilling tasks. The Series HP-A designation places it in Allied Machine and Engineering's high-performance lineup, optimized for universal workpiece materials including cast iron, steel, non-ferrous metals, and non-metallic materials. The straight flute design suits applications where chip evacuation and rigidity are the primary concerns. This configuration ships without through-coolant capability, so external coolant or flood cooling is the recommended approach for chip management and heat control.

Key Features

• Diameter range: 31/32 inches to 1-3/8 inches for versatile insert sizing
• 4MT taper shank with 1.231-inch shank diameter for secure spindle engagement
• Straight flute design supports rigidity in short-reach drilling operations
• Series HP-A high-performance body rated for universal workpiece material codes K, M, N, and P
• Maximum drill depth of 3 inches with a body length of 3-25/32 inches and flute length of 3 inches
• No through-coolant — compatible with external or flood coolant delivery

Compatibility

Designed as an OEM-style replacement and standard-fit drill body for Series HP-A indexable spade drill systems accepting 4MT taper shank tooling. Compatible with spade drill inserts in the 31/32-inch to 1-3/8-inch diameter range for this series.

Installation Notes

Installation is performed by qualified machinists. Ensure the machine spindle is fully powered down and locked out before mounting or removing the drill body from the taper socket. Clean the taper bore and shank surfaces thoroughly before seating to ensure full contact and accurate runout. Follow the machine tool manufacturer's draw-bar torque and retention requirements for 4MT tooling; do not exceed the recommended axial depth of cut for the selected insert grade.