Collis Tool 68848 Adjustable Spindle Extension 3MT

Product Description

The COLLIS TOOL 68848 is an adjustable spindle extension assembly designed for use in machining applications where standard spindle reach is insufficient. It accepts a 3MT (No. 3 Morse Taper) shank and features a 1-3/8-12 shank thread size, making it compatible with precision machine tool setups. The extension diameter measures 1-1/4 inches with an extension length of 1 inch and a shank length of 4-5/8 inches. A flange thickness of 3/8 inch contributes to rigid, stable support during operation. Machinists and tool room technicians install this component to extend cutting tool reach on milling machines, drill presses, and similar spindle-driven equipment.

This assembly is suited for precision machining environments where extended tool reach is required without sacrificing concentricity or rigidity. It is typically installed on machine tools with No. 3 Morse Taper spindles. The adjustable adapter nut number for this assembly is 66607, which is used in conjunction with this extension for proper adjustment and locking. A 1/4 x 1 inch key size is specified for secure drive engagement during operation.

Key Features

• 3MT (No. 3 Morse Taper) shank for direct spindle mounting
• 1-3/8-12 shank thread size for secure threaded engagement
• 1-1/4 inch extension diameter for rigidity under load
• 4-5/8 inch shank length provides extended reach capability
• 3/8 inch flange thickness for stable seating against spindle face
• Compatible adapter nut 66607 included as reference for complete assembly

Compatibility

Designed for use with machine tool spindles accepting a No. 3 Morse Taper. Adjustable adapter nut 66607 is the designated mating component for this extension assembly.

Installation Notes

Installation should be performed by a qualified machinist or tool room technician familiar with Morse Taper tooling. Power down and lock out the machine spindle completely before installing or removing the extension assembly. Ensure the taper bore and taper shank are clean and free of debris before seating to maintain accurate alignment. Do not strike the assembly with hard tools during installation; use a proper drift and soft mallet if removal force is required.