CRT Holders

Scientific Cutting Tools CRT Holders (CRT stands for Coolant Ring Technology) are made from high-quality heat treated steel and come with a black oxide coating. They are engineered to allow for better coolant penetration deep into the bore, reducing the temperature at the cutting edge. The overhang of the tools used with the holders is infinitely adjustable rather than fixed, allowing for maximum performance without chatter or other performance-related issues. Use the CRT holder in conjunction with our qualified boring bars and/or our qualified threading tools for quick change machining at optimal performance levels.

CRT Holder Adjustable Stop Instructions:

If you wish to remove the stop, first turn the locking screw, with a 3/32 hex key, 1/2 turn counterclockwise. Do not turn the locking screw more than one turn or remove the locking screw. You can use the same 3/32 hex key for both the adjustable stop and the tool lock down screw.

To insert the adjustable stop into the holder: Turn the locking screw clockwise until it bottoms out, do not over-tighten. Turn the locking screw counterclockwise one turn. Line up the locking pin with the keyway in the holder and slide the stop into the holder. Turn the locking screw clockwise until the locking pin bottoms against the keyway.

To set the stop location: Insert a tool into the holder at the desired length of overhang and tighten the tool lock down screw. Slide the stop in the holder until it comes into contact with the back of the tool and tighten the locking screw. Now all other tools will repeat to the same overhang.

If the locking pin is removed from the stop, insert the locking pin into the stop with the countersink facing the locking screw and the long side to the outside of the stop.  When the screw is tightened the pin should rise up out of the hole.  Snug the locking screw and back off one turn. Now the stop can be inserted into the holder.

Article updated on February 3, 2023