Advanced Metric DIN Tube Fittings: Zero-Leak High-Pressure Performance
Fitsch is a premier China metric DIN stainless steel fittings manufacturer and factory, engineering high-precision fluid connectors strictly to ISO 8434-1 and DIN 2353 international standards. Designed for high-pressure hydraulic pipelines, these metric components feature a 24-degree cone seat configuration across three pressure classifications: LL (Very Light), L (Light), and S (Heavy Duty) series.
By utilizing high-grade 304, 316, and 316L stainless steel, our metric fittings offer extreme structural yield strength and defense against rust, chemical corrosion, and thread galling. They are the globally trusted solution for industrial machinery, offshore marine instrumentation, oil and gas networks, and automotive manufacturing plants.
️ Dual Biting Systems: EO2 vs. Double Edge Progressive Ring
We offer two distinct engineering technologies for securing your 24° cone metric connections, allowing you to choose the perfect sealing system for your specific installation environment:
Type 1: EO2 Functional Nut System
The EO2 Functional Nut combines a heavy-duty retaining bite ring and a captive elastomeric profile seal inside a single, pre-assembled nut package. This all-in-one design eliminates loose parts, prevents assembly errors, and uses pure elastomeric sealing to guarantee a dry, zero-leak hydraulic connection under intensive system vibration.
Type 2: Double Edge Progressive Ring System
Our standard Double Edge Progressive Ring utilizes a classic bite-type geometric ring with dual cutting edges. As the nut is torqued down, the double-edged ring progressively cuts into the outer surface of the stainless steel tube. This dual-anchor design creates a controlled, high-strength safety block capable of handling severe pressure shocks and thermal fluctuations.
Comprehensive Geometric Shapes
Our CNC lines produce high-tolerance bodies to support diverse layout requirements:
Straight: Inline connectors to bridge fluid paths smoothly.
Elbow (90° and 45°): Forged sharp body curves to navigate tight machinery spaces.
Tee: Three-way branch connections to split or blend process lines.
Cross: Symmetrical four-way intersection manifolds to distribute multi-line hydraulic paths.
Versatile Connection Type Interfaces
We engineer our metric DIN 2353 range to transition effortlessly from rigid tube structures to any mechanical port via these primary connection options:
1. Connection to Tube
Uses the 24° cone mechanical biting ring or EO2 nut to secure a direct, permanent joint over rigid metric hydraulic tubing.
2. Connection to Swivel
Equipped with a pre-assembled metric female swivel nut and an O-ring (DKO style). This profile allows for easy coupling into existing male lines without twisting the structural hose or pipe layout during installation.
3. Connection to Male Stud (Parallel Port)
Features parallel male threads (Metric or BSPP) paired with a specialized Profile Elastic Seal (ED-seal) or O-ring with retaining washer. Ideal for flat-faced port blocks found on heavy-duty hydraulic pumps and control manifolds.
4. Connection to Taper Stud
Features tapered thread profiles (Metric Taper or BSPT) that self-seal via localized thread deformation upon torque. Excellent for fixed, structural port anchors.
5. Connection to Adjustable Stud
Features a locknut, backup washer, and O-ring arrangement. This design permits technicians to orient the body of an elbow or tee fitting in the exact direction needed before locking down the seal tight against the face of the port.
6. Connection to Banjo
Specialized compact connectors utilizing a hollow banjo bolt and a ring-shaped housing block. Excellent for pivoting fluid ports in restricted or low-clearance areas where a standard 90-degree elbow cannot spin into place.
Technical Data & Engineering Specifications
Our state-of-the-art CNC manufacturing facility ensures strict compliance with tolerance margins. Below are the baseline engineering metrics for our premium stainless steel lines:
Series Classification | Tube O.D. Range (mm) | Thread Specification Range | Nominal Operating Pressure (SS316) |
LL Series (Very Light) | 4mm – 12mm | M8×1.0 to M18×1.5 | Up to 100 Bar (1,450 PSI) |
L Series (Light Duty) | 6mm – 42mm | M12×1.5 to M52×2.0 | Up to 315 Bar (4,500 PSI) |
S Series (Heavy Duty) | 6mm – 38mm | M14×1.5 to M52×2.0 | Up to 630 Bar (9,100 PSI) |
Design Standards: ISO 8434-1, DIN 2353, DIN 3852-1, DIN 3852-2
Elastomer Compounds: Fluorocarbon (FKM / Viton) or Nitrile (NBR) for captive ED seals and DKO O-rings.
Material Availability: AISI 304, AISI 316, AISI 316L, AISI 316Ti Stainless Steel
The Fitsch Advantage: Sourcing from Our China Factory
Purchasing your hydraulic components directly from Fitsch (Ningbo International Trade Co., Ltd.) provides distinct strategic benefits over standard distribution channels:
Over 20 Years of Rich Production Expertise: We deeply understand global precision requirements and standard certifications (ISO, DIN, SAE, JIS).
Massive Industrial Capacity: Armed with 200 advanced CNC machines, we comfortably handle scale orders with a maximum capacity of 1,500,000 fluid connectors per month.
Failproof Supply Chain Integration: We operate within our local industrial manufacturers union to lower overhead costs, passing those factory-direct savings straight to your procurement budget without compromising component tolerances.
Rigorous Quality Control Tracking: From raw material material-spectral testing to finalized thread go/no-go gauge validation, every batch is fully trackable.
Contact Us for Pricing & Catalogs
Ready to place a custom project order or request a full metric stainless catalog quote? Reach out to our technical support team:
Email: info@fitsch.cn
Factory Address: No.133-3 Anjiexi Road, Sanqishi Town, Yuyao 315412, China
