"Global Sourcing Guide: Top Manufacturers And Cross-References for Soft-Seal Cutting Rings (DIN 2353)"

In high-vibration, high-pressure hydraulic environments, traditional metal-to-metal cutting rings often suffer from "settling effects" and micro-leakage. To achieve a 100% gas-tight, zero-leak connection, modern fluid power engineering relies on soft-seal cutting rings (conforming to DIN 2353 / ISO 8434-1). These hybrid components integrate a mechanical biting edge with elastomeric seals (such as NBR or FKM/Viton) to eliminate fluid "sweating."

Because these elastomeric bite rings are highly specialized, procurement and engineering teams must navigate a complex landscape of proprietary patents and brand-specific naming conventions. Navigating interchangeability can be challenging, as the elastomeric sealing inserts vary structurally by manufacturer.

To streamline your supply chain and establish a resilient multi-vendor sourcing strategy, this directory compiles the world’s leading technology innovators, Italian precision manufacturers, and tier-1 integration suppliers. Use the cross-reference matrix below to identify direct alternatives, understand system compatibility, and optimize your procurement workflow.

The Global Directory of Soft-Seal Cutting Ring Manufacturers -ISO 8434-1 / DIN 2353

Group A: The Original Technology Manufacturers (Patent Holders)

These companies own the specific R&D and core patents for the dual metal-and-rubber bite mechanisms:

• VOSS Fluid GmbH (Germany)

  • System Name: VOSS Cutting Ring ES-4 Type 

  • Design: The benchmark for soft-seal bite rings. It features a custom-molded elastomer block embedded in the metal ring body alongside a hard mechanical stop to physically prevent overtightening. 

• STAUFF (Walter Stauffenberg GmbH & Co. KG - Germany)

  • System Name: FI-WDDS Series Soft-Sealing Cutting Rings

  • Design: Combines standard metal-biting capabilities with embedded, high-integrity FKM/NBR secondary soft seals designed to explicitly absorb fluid vibration. 

• Parker Hannifin Corporation (USA)

  • System Name: Ermeto EO-2 DOZ Soft Seal Cutting Rings

  • Design: Dominates global procurement. It uses a captive, highly visible functional elastomeric ring nested within the bite-retaining nut assembly to enforce an airtight, zero-sweat hydraulic seal.

• Danfoss / Eaton (Denmark / USA)

  • System Name: Walring (Walterscheid System) Soft Seal Cutting Ring System

  • Design: Built specifically for heavy-duty, high-impulse mobile machinery. It combines a 24° profile cutting ring with an adjacent custom elastomer seal ring. 

• FITSCH (Ningbo Fitsch International Trade Co. Ltd. - China)

  • System Name: Form A/F Soft-Seal & DOZ Series

  • Design: An aggressive manufacturing power in Asia supplying precision-machined Soft-Seal Cutting Rings and alternative EO2-Style Rings optimized for high-vibration systems. 

Group B: The Top Italian Precision Manufacturers

Italy is a global hub for high-pressure hydraulic components, and these companies manufacture specific, innovative soft-seal ring lines:

• Rastelli Raccordi (Italy)

  • System Name: AR3/C Cutting Ring With Tight Sealing

  • Design: Specifically engineered for DIN 2353 / ISO 8434-1 fittings. The AR3/C features a vulcanized rubber seal ring on its axial front head and an integrated rear O-ring gasket, giving it a dual-barrier safety layer. 

• Cast S.p.A. (Italy)

  • System Name: B4 Patented Cutting Ring 

  • Design: A highly specialized, heavy-duty carbon and stainless steel ring. It incorporates two separate cutting edges and two integrated elastomeric seals, providing six independent sealing points across the connection interface.

• Stima S.r.l. (Italy)

  • System Name: DC Series Soft-Seal Cutting Rings

  • Design: A direct high-pressure alternative that features a mechanical internal stop matched with dual FPM/FKM soft gaskets to deliver 100% airtight gas sealing. 

Group C: German Specialty Producers & Brand Powerhouses

• HANSA-FLEX AG (Germany)

  • System Name: SRDO V / SRWD-VI Series Cutting Ring with OR, ISO 8434-1, L/

  • Design: Europe's largest independent fluid logistics company provides its own cataloged, certified metric soft-seal rings with NBR and Viton elements for standard 24° cone connections.

• PH Industrie-Hydraulik (Germany)

  • System Name: ES4 Double-Bite Cutting Ring with Soft-Seal

  • Design: Specialized exclusively in high-grade stainless steel (AISI 316Ti). Their ES4 FPM/FKM lines provide heavy corrosion resistance combined with elastomer-assisted sealing for offshore and marine applications.

• Blango (Germany)

  • System Name: DIN Metric Soft-Seal Line Trinova Cutting Rings

  • Design: A strict OEM component supplier in Central Europe, offering specialized metric hybrid soft-seal rings for automated manufacturing machinery.

Group D: Major European Tier-1 Integration Suppliers

These companies are massive multinational entities that design, control quality, and catalog proprietary soft-seal ring solutions to heavy industry, infrastructure, and mining sectors:

• HydraSpecma (Denmark / Sweden)

  • System Name: Cutting Ring Softseal Series

  • Design: The dominant fluid power force across the Nordic regions. HydraSpecma engineers robust soft-seal ring systems specifically rated for extreme sub-zero cold starts down to -55°C. 

• Fluiconnecto by Manuli (Global / Netherlands)

  • System Name: Cutting Ring Soft Seal  (RSS Series)

  • Design: This premium product line features an NBR-based O-ring and a PU-shaped gasket combined with a built-in mechanical stop to eliminate overtightening and low-pressure sweating.

• DICSA (Spain)

  • System Name: Cutting Ring with Soft-Seal DIN 2353 Range

  • Design: One of the largest international stainless steel fitting entities. They offer an extensive standalone catalog of independent soft-seal rings used as immediate replacements for older, purely metal rings.

• Hydroscand (Sweden)

  • System Name: D – ED B4 Cutting Ring/ Soft Seal Series

  • Design: Operating a massive global service network, Hydroscand designs and supplies multi-edge biting rings accompanied by captive, heavy-duty soft elastomeric profiles. 

Quick Reference Summary

Cross-References for Soft-Seal Cutting Rings (DIN 2353)"

FITSCH TYPE‘S HO2 DOZ is interchangeable to these brands

FITSCH TYPE‘S Soft Sealing Cutting Ring with OR is interchangeable to these brands of Italy's Brand

Soft-Seal Cutting Rings is developed by these brand, but the same function  as the above, all is interchangeable.

Fitsch is a premier manufacturer of high-performance soft-seal cutting rings, fully capable of producing the industry’s most trusted styles, including EO2, DOZ, other type fittings. By leveraging advanced precision machining and engineering capabilities, Fitsch delivers interchangeable, zero-leak fluid power solutions tailored to global industrial standards.

Fitsch offers complete flexibility across critical material configurations to meet diverse operating environments:

• Base Metals: High-grade Carbon Steel (with advanced corrosion-resistant zinc plating) and premium Stainless Steel for marine or highly corrosive settings.

• Elastomer Seals: Industrial-standard NBR (Nitrile) for standard oil-based hydraulics, and high-performance FKM (Viton) for extreme temperature or aggressive chemical applications.

By providing seamless compatibility with DIN 2353 / ISO 8434-1 specifications, Fitsch positions itself as a comprehensive, single-source manufacturing partner for global B2B procurement managers and hydraulic engineers alike.