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Updated: 21. august 2026

Published: 21 May 2019

Parker EO2 cutting ring fittings – Avoid leaks in a hydraulic system

EO‑2 is a further development of the classic cutting ring fitting. The system combines cutting ring and seal in a single functional nut (EO‑2 Plus), which minimises assembly risks and ensures a stable, tight connection – even under vibration and pressure pulses.

Why industry chooses EO‑2

Leak-free operation and less maintenance

  • An integrated elastomer seal on the tube side prevents seepage/leakage between nut and tube.
  • Stable sealing without retightening – even under demanding operating conditions.

Easy and reliable assembly

  • Cutting ring and seal are integrated in the nut – fewer loose parts, fewer errors.
  • Visual check: a built-in hardened guide ring leads the cutting ring correctly into the tube.
  • Can be assembled without a pre-assembly cone; recommended for series production with Parker EOMAT UNI.

High durability and compatibility

  • SPH-hardened rings as standard in both steel and stainless versions.
  • Compatible with Parker DIN fittings and typical DIN tube systems.

Specifications and standards

  • Series/sizes: LL, L, S from 4LL to 38S (06–42 mm for both L and S).
  • Pressure: up to 800 bar (S series) and 500 bar (L series) – 4x safety factor.
  • Materials and seals:
  • Steel, Cr(VI)-free surface, NBR seal.
  • Stainless steel 316Ti with silver plating, FKM seal.
  • Standards: DIN 2353, DIN 3861 and ISO 8434‑1.

SPH cutting ring upgrade

  • SPH (thermochemical surface hardening) withstands aggressive media and corrosion.
  • The bright surface makes the rings easy to recognise compared with the previous carbonitrided black rings.
  • Pre-assembly and final torque parameters remain unchanged.

Typical applications

  • Mobile construction equipment and agricultural machinery
  • Marine installations and offshore
  • Stationary machine tools and production lines
  • Wind turbines and energy plants

Compatibility and alternatives

  • Fully compatible with Parker DIN fittings in corresponding series/sizes.
  • Alternatives: classic cutting ring fittings (without soft seal) – choose EO‑2 when leak-free operation and low maintenance are requirements.

Hymatik in Odense

  • +100,000 item numbers in stock and fast delivery, also internationally.
  • Contact: tel. 63 12 83 00 or write to us for specific item numbers and datasheets.
Eo 2 system

SPH cutting ring upgrade for EO-2 functional nuts in steel and stainless steel

FAQ about EO‑2

What is the difference between EO‑2 and traditional cutting ring fittings? EO‑2 has an integrated elastomer seal that provides a stable, leak-free seal and reduces the need for retightening.

What pressures can EO‑2 handle? Up to 800 bar in the S series and 500 bar in the L series, both with a 4x safety factor.

Which seals and materials are available? Steel (Cr(VI)-free) with NBR seal or stainless 316Ti with FKM seal.

Is the SPH ring compatible with existing assembly parameters? Yes. Pre-assembly and final torque parameters are unchanged.

How do I know whether my assembly is correct? The hardened guide ring leads the cutting ring. Visual inspection of the gap between the cut and the seal confirms correct engagement.

Can EO‑2 be used in corrosive environments? Yes, choose stainless 316Ti and an FKM seal. The SPH hardening further increases corrosion resistance