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Bernardo  |  SKU: 24-1048

Extension socket MK 4 / 4

€72,52 (22% VAT incl.)
Business solution up to 30 installments

Delivery and Shipping

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Description

Morse taper extension sleeve MT 4/4 — tool holder MT 4 in machine seats MT 4. 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 4
  • Internal taper: MT 4
  • Standard: DIN 2187
  • Workmanship: Fully hardened, ground taper

Technical specifications

Specification Value
External taper (machine) MT 4
Internal taper (tool) MT 4
Standard DIN 2187
Workmanship Fully hardened, ground taper

Logistics

Original spare parts available with 3–5 working days shipping. Customer service in Italian available.

Frequently Asked Questions

What is an MT 4/4 extension sleeve for and when is it needed?

The MT 4/4 extension sleeve has an MT 4 external taper (fits into the machine) and an MT 4 internal taper (holds the tool). It allows you to mount tools with an MT 4 Morse taper shank on machines with an MT 4 Morse taper seat — the larger number is the machine's taper, the smaller is the tool's taper. The extension sleeve allows the smaller tool to fit into the larger seat, maintaining DIN 2187 concentricity.

Difference between extension sleeve and reduction sleeve?

The extension sleeve fits a smaller taper (tool) into a larger seat (machine): MT 4/4 → the machine has MT 4, the tool has MT 4. The reduction sleeve does the opposite — it fits a larger taper 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 extractor pin (drawbar) that slides into the spindle hole: insert the pin 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 working days shipping. Customer service in Italian available.

Product safety

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