240mm Extension Sleeve MK3xMK4 Hardened Ground, DIN 2187 - TECWERK

Take advantage of a hardened, precision‑ground construction and DIN 2187 conformity to ensure secure, low‑runout tool holding and reliable repeatability in everyday workshop use. Order the part directly via Metav Werkzeuge or consult our technical team for application advice.

Extension sleeve DIN 2187 MT3×MT4 — hardened and ground, precision version (TECWERK)

An extension sleeve DIN 2187 MT3×MT4 for accurate, secure mounting of tools with Morse tapers in machining and tool‑holding applications.

• DIN 2187 accuracy version
• Hardened and ground inside and outside
• For tools with Morse taper MT3×MT4
• Outer diameter 48 mm, length 240 mm

Precision retention for Morse‑taper tooling that improves runout and repeatability

The sleeve is manufactured to DIN 2187, offering a defined interchangeability level for Morse‑taper tooling. By using a fully hardened body with both inner and outer surfaces ground, the adapter provides a consistent seating surface that reduces radial runout and vibration during spindle rotation. For workshops that rely on repeatable concentricity, this means fewer re‑setups and higher first‑pass accuracy. The DIN reference also simplifies procurement and replacement planning, because compliance with the standard ensures compatibility with other DIN‑rated holders.

Engineered to withstand routine workshop stresses and handling

Constructed in a precision execution, the sleeve resists wear from repeated mounting and dismounting thanks to its heat‑treated structure. The combination of full hardening and precision grinding translates into extended service life and steady performance under cyclic loads. Where downtime and maintenance budgets are critical, the robust construction lowers the frequency of replacements and contributes to a steadier production flow. The hardened finish also helps preserve the taper geometry that determines how securely a tool is held.

Clear compatibility and straightforward fitting for Morse taper toolsets

Designed specifically for use with tools that have a Morse taper, the adapter matches an outer MT3 taper to an inner MT4 taper, allowing smaller spindles or adaptors to accept larger Morse‑taper tooling where required. Installation is mechanical and familiar to experienced machinists: insert, seat and secure per usual workshop practice. For those less familiar with taper standards, a Morse taper is a self‑locking conical fitting that locates and centres tooling without separate clamping, providing a clean mechanical interface when dimensions and finish are correct.

Standard conformity and measurable dimensions for planning and inventory

The adapter’s measurable attributes support planning and machine setup: an outer diameter of 48 mm, an overall length of 240 mm and a seated length of 146 mm are provided to verify clearance and reach in chucks, spindles and toolposts. These numeric data facilitate tool‑table checks and ensure the sleeve integrates into existing tooling systems without guesswork. Choosing a DIN‑specified component simplifies procurement, since parts from different suppliers that conform to the same standard are functionally compatible.

For machining operations that value secure seating and long‑term stability, contact Metav Werkzeuge to arrange supply or technical clarification on the TECWERK DIN 2187 extension sleeve — our specialists in Emmerich can advise on fitment and stock availability.

Technical Data

• SKU: 2000832362NW
• Standard: DIN 2187
• Product: Extension sleeve (DIN 2187)
• Brand: TECWERK

Facts

• Outer diameter: 48 mm
• Overall length (L2): 240 mm
• Seated length (L1): 146 mm
• Inner taper: MT4
• Outer taper: MT3
• Packaging unit: 1

Special features

• Accuracy execution (precision version)
• Fully hardened construction
• Inner and outer surfaces ground
• For tools with Morse taper

FAQ

Is this sleeve compatible with standard Morse‑taper tools? Yes. The extension sleeve is specified to DIN 2187 and designed to adapt between an outer MT3 taper and an inner MT4 taper, allowing standard Morse‑taper tooling to be used where this adapter is fitted.

What are the key benefits of the hardened and ground finish? The hardened, ground surfaces on the sleeve reduce wear and maintain taper geometry, which improves seating accuracy and lowers radial runout for more consistent machining results with the TECWERK adapter.

Which dimensions should be checked before ordering the sleeve? Confirm spindle or holder clearance against the sleeve’s outer diameter of 48 mm and overall length of 240 mm, and ensure the seated length of 146 mm fits within the available mounting space.

Does the sleeve require special maintenance? Routine inspection for burrs or contamination and gentle cleaning of the mating tapers is recommended; the hardened and ground finish is designed for longevity under normal workshop use.

Can the adapter be used for heavy‑duty turning and milling operations? The sleeve’s hardened construction and precision grinding are intended to sustain regular workshop loads; specific suitability depends on the intended cutting parameters and machine rigidity.

Manufacturer / Responsible: NORDWEST Handel AG, Robert‑Schuman‑Straße 17, 44263 Dortmund