Allied Machine 20631-1250 Indexable Spade Drill 1-1/2 to 2-3/8 in

Product Description

The ALLIED MACHINE AND ENGINEERING 20631-1250 is an indexable spade drill body designed for high-performance hole-making across a broad range of workpiece materials. It accepts interchangeable spade drill inserts sized for drilling diameters from 1-1/2 inches up to 2-3/8 inches, with a maximum drilling depth of 4 inches. The tool is built from steel, features a straight-flute geometry, and includes through-coolant capability via axial concentric and radial coolant entry to manage heat and chip evacuation at the cutting zone. A flatted cylindrical shank measures 1-1/4 inches in diameter. This tool body is part of Allied Machine's HP-C Series and is installed by machinists and tool-room professionals on CNC machining centers and manual drilling equipment.

The 20631-1250 is suited for production and job-shop drilling operations in ferrous and non-ferrous workpiece materials, including cast iron, steel, aluminum, and non-metallic materials corresponding to material codes K, M, N, and P. The short-length designation makes it appropriate for standard-reach applications where rigidity is a priority. The through-coolant feature supports elevated feed rates and extended insert life, particularly in materials that generate significant heat during cutting. This tool body is a common selection for shops running high-volume hole-making with indexable insert tooling.

Key Features

• Drilling diameter range: 1-1/2 inches to 2-3/8 inches
• Maximum drilling depth: 4 inches with straight-flute body
• Through-coolant delivery via axial concentric and radial ports; 1/4 inch NPT coolant hole thread
• Flatted shank, 1-1/4 inches diameter, for positive drive and anti-rotation retention
• HP-C Series high-performance designation; steel body construction
• Universal primary workpiece material compatibility: cast iron, steel, aluminum, and non-metallic materials (K, M, N, P codes)

Compatibility

The 20631-1250 is an HP-C Series spade drill body compatible with Allied Machine and Engineering indexable spade drill inserts sized for the 1-1/2 inch to 2-3/8 inch diameter range. No specific machine model compatibility data was provided; confirm insert and holder compatibility with Allied Machine documentation before ordering.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Ensure the machine spindle is fully powered down and locked out before mounting or changing the tool body or inserts. Verify the flatted shank seating and set-screw engagement in the tool holder to prevent rotation under cutting loads. Connect the through-coolant supply line to the 1/4 inch NPT port and confirm coolant flow and pressure before beginning any drilling cycle.