Collis Tool 70754 Adjustable Adapter Assembly MT4

Product Description

The COLLIS TOOL 70754 is an adjustable adapter assembly designed to mount tooling with a Morse Taper 4 (MT4) bore onto spindles with a 1-7/8-12 inch threaded shank. This type of adapter is used in machining and metalworking applications to bridge different taper and thread standards, allowing compatible cutting tools, drill chucks, or arbors to be secured to a machine spindle. The assembly features a flat length of 3 inches and accepts a 5/16 x 1-1/4 inch key for positive drive engagement. Locknut number 66608 is specified for use with this assembly. At 3.5 pounds, it is a solid, production-grade component suited for shop floor installation by machinists and tool-room technicians.

This adapter assembly is intended for use in milling machines, lathes, and similar machine tools where MT4 tooling must be adapted to a 1-7/8-12 threaded spindle interface. It is appropriate for both production and maintenance environments where tooling changes require a reliable, repeatable adapter solution. Installation is typically performed by a machinist or tool-room technician during setup or tooling changeover. The included locknut reference (66608) allows for secure clamping of the taper during operation.

Key Features

• MT4 Morse Taper bore for standard MT4 tooling compatibility
• 1-7/8-12 inch threaded shank for spindle mounting
• 3-inch flat length for proper seating and clearance
• 5/16 x 1-1/4 inch key size for positive rotational drive
• Compatible with locknut number 66608 for secure tool retention
• Sold individually (package quantity of 1)

Compatibility

Designed as an OEM-style adjustable adapter for machine tool spindles with a 1-7/8-12 inch threaded shank requiring an MT4 Morse Taper interface. Use with locknut 66608 as specified by the manufacturer.

Installation Notes

Installation should be performed by a qualified machinist or tool-room technician. De-energize and lock out the machine before installing or removing any spindle tooling or adapter assemblies. Ensure mating taper surfaces are clean and free of burrs or debris before seating the adapter. Secure with the specified locknut and verify all drive keys are properly seated before resuming machine operation.