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Bernardo  |  SKU: 24-1055

Extension socket CM 6 / 4

€134,44 (22% VAT incl.)
Business solution up to 30 installments

Delivery and Shipping

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Description

Morse Taper Extension Sleeve MT 6/4 — holds MT 4 tools in MT 6 machine spindles. Fully hardened, internal and external taper ground according to DIN 2187. Made in Austria, distributed in Italy by Krollit — official Bernardo distributor since 2007.

  • External taper: MT 6
  • Internal taper: MT 4
  • Standard: DIN 2187
  • Processing: Fully hardened, ground taper

Technical Specifications

Specification Value
External Taper (Machine) MT 6
Internal Taper (Tool) MT 4
Standard DIN 2187
Processing Fully hardened, ground taper

Logistics

Original spare parts available with 3–5 business day shipping. Customer support available in Italian.

Frequently Asked Questions

What is a CM 6/4 extension sleeve used for and when is it necessary?

The CM 6/4 extension sleeve has an MT 6 external taper (fits into the machine) and an MT 4 internal taper (holds the tool). It allows mounting tools with an MT 4 Morse taper shank on machines with an MT 6 Morse taper spindle — 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 spindle, maintaining DIN 2187 concentricity.

Difference between an extension sleeve and a reduction sleeve?

An extension sleeve holds a smaller taper (tool) in a larger spindle (machine): CM 6/4 → the machine has MT 6, the tool has MT 4. A reduction sleeve does the opposite — it holds a larger taper in a smaller spindle. They are not interchangeable. Always check which one you need before purchasing.

How do you remove the sleeve from the Morse taper spindle?

Using the drawbar (pull rod) that runs through the spindle's bore: insert the pin from the opposite side and tap with a hammer. Alternatively, use the flat drift key inserted into the spindle's slot. Never force it with improvised tools — the Morse taper is self-locking, and sideways force can damage the spindle.

Delivery times?

Original spare parts available with 3–5 business day shipping. Customer support available in Italian.

Product safety

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