Collis Tool 70094 Quick Change Master Holder NMTB50

Product Description

The COLLIS TOOL 70094 is a Rapid Switch 300 quick change master tool holder designed for machining centers and milling applications that use NMTB50 taper spindles. It accepts rotary tooling through a rapid-change interface, reducing setup time between operations without removing the master holder from the spindle. The nose diameter measures 3 inches and the projection is 2.25 inches, making it suited for standard reach applications. This holder is installed by machinists and toolroom technicians working in production and job-shop environments.

The 70094 is intended for use with Rapid Switch 300 series quick change tooling systems on machines equipped with NMTB50 tapered spindles. It serves as the master holder that remains in the spindle while individual tool holders are swapped in and out at the nose, streamlining tool changes during multi-operation setups. Typical applications include milling, drilling, and boring on vertical and horizontal machining centers in both production and prototype environments.

Key Features

• Rapid Switch 300 quick change system interface for fast tool swaps without spindle removal
• NMTB50 taper shank for direct mounting in compatible spindles
• 3 inch nose diameter provides a robust clamping surface for the quick change interface
• 2.25 inch projection suits standard reach machining setups
• Designed as a master holder, allowing multiple tool holders to index off a single installed unit

Compatibility

Designed for use with the Rapid Switch 300 quick change tooling system on machine spindles with an NMTB50 taper. Compatible tool holders must be Rapid Switch 300 series; no specific machine model compatibility was provided in available product data.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before seating or removing the master holder. Ensure the NMTB50 taper and spindle bore are clean and free of chips or burrs before installation, as contamination will affect runout and clamping force. Follow the machine tool manufacturer's drawbar torque and retention stud specifications when securing the holder.