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Extension socket CM 6 / 3
Extension socket CM 6 / 3 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Extension socket CM 6 / 3
Description
Morse taper extension sleeve CM 6/3 — MT 3 tool holder in MT 6 machine tapers. Fully hardened, internal and external taper ground according to DIN 2187. Made in Austria by Bernardo; Krollit has been the official distributor in Italy since 2007.
- External Taper: MT 6
- Internal Taper: MT 3
- Length: 218 mm
- Standard: DIN 2187
- Finish: Fully hardened, taper ground
Logistics
Original spare parts available with 3–5 business days shipping. Customer support in Italian available.
Technical specifications
Technical specifications
| Specification | Value |
|---|---|
| External taper (machine) | MT 6 |
| Internal taper (tool) | MT 3 |
| Length | 218 mm |
| D (outer diameter) | 63.8 mm |
| d (inner diameter) | 23.825 mm |
| Standard | DIN 2187 |
| Finish | Fully hardened, taper ground |
Warranty
Warranty terms and support procedures are available on the dedicated Krollit page.
View Krollit warranty termsFAQ / Frequently asked questions
Frequently Asked Questions
What is a CM 6/3 extension sleeve used for and when is it needed?
The CM 6/3 extension sleeve has an MT 6 external taper (fits into the machine) and an MT 3 internal taper (holds the tool). It allows you to mount tools with an MT 3 Morse taper shank on machines with an MT 6 Morse taper seat — the larger number is the machine taper, the smaller is the tool taper. The extension sleeve allows the smaller tool to fit into the larger seat, maintaining DIN 2187 concentricity. Length: 218 mm.
Difference between extension sleeve and reduction sleeve?
An extension sleeve allows a smaller taper (tool) to fit into a larger seat (machine): CM 6/3 → the machine has MT 6, the tool has MT 3. A reduction sleeve does the opposite — it allows a larger taper to fit into a smaller seat. They are not interchangeable. Always check which one you need before purchasing.
How do you remove the sleeve from the Morse taper seat?
Using the ejector rod (drawbar) that runs through the spindle hole: insert the rod from the opposite side and strike with a hammer. Alternatively, use the flat extraction wedge inserted into the spindle slot. Never force it with improvised tools — the Morse taper is self-locking, and lateral force can damage the seat.
Delivery times?
Original spare parts available with 3–5 business days shipping. Customer support in Italian available.
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