What is the correct installation procedure for this cutting ring?

Proper installation is critical for a leak-free connection. First, cut the tube squarely and deburr both inside and outside edges. Slide the nut and cutting ring onto the tube, ensuring the ring's cutting edge faces the tube end. Insert the tube into the fitting body until it bottoms out. Hand-tighten the nut, then use a wrench to tighten an additional 1.25 turns for sizes up to 12mm, or 1 turn for larger sizes. This creates the bite and seals the connection. Avoid over-tightening, which can damage the ring or tube. After assembly, check for leaks under pressure. For repeated assemblies, inspect the ring for wear and replace if necessary.

Can this cutting ring be used with different tube materials?

The cutting ring is designed for use with metallic tubes, particularly stainless steel and carbon steel. It is not recommended for plastic or soft metal tubes, as the cutting edge may not achieve a proper bite, leading to leaks. When using with carbon steel tubes, consider the potential for galvanic corrosion if the system is exposed to electrolytes; in such cases, use a dielectric union or choose a compatible material. For stainless steel tubes, ensure the tube hardness is compatible with the ring's hardness (HRC 35-40). Tubes with hardness above HRC 80 may cause excessive wear on the cutting edge. Always refer to the fitting manufacturer's recommendations for specific tube materials.

How do I choose the right size cutting ring for my application?

Select the cutting ring based on the tube's outer diameter (OD). This ring covers OD sizes from 6mm to 42mm. Measure the tube OD accurately using a caliper. Ensure the ring size matches the tube OD exactly; using a mismatched size will result in leaks or damage. Consider the pressure rating: for sizes up to 12mm, the ring is rated for 630 bar; for larger sizes, 420 bar. If your system operates near these limits, verify the safety factor. Also, check the temperature range: -40°C to 200°C. For applications outside this range, consult the manufacturer. Finally, ensure compatibility with the fitting body and nut, which should conform to ISO 8434-1 or DIN 2353.

Cutting Ring

Precision Cutting Ring for 6-42mm OD Tubes – 316 SS, 630 bar Rating

The cutting ring is a critical component in bite-type tube fittings, designed to create a secure, leak-proof connection by biting into the tube surface. This model is crafted from 316 stainless steel and is compatible with tube outer diameters from 6mm to 42mm, offering pressure ratings up to 630 bar depending on size.

Material

316 Stainless Steel

Operating Temperature

-40°C to 200°C

Hardness

HRC 35-40 (after hardening)

Standards

ISO 8434-1, DIN 2353

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How Does the Cutting Ring Ensure Leak-Free Performance in High-Pressure Systems?

The cutting ring is a precision-engineered component used in bite-type tube fittings to create a permanent, leak-proof seal. This specific ring is manufactured from 316 stainless steel, providing excellent corrosion resistance and durability. It is designed for tube outer diameters ranging from 6mm to 42mm, with pressure ratings up to 630 bar for smaller sizes, ensuring compatibility with a wide range of hydraulic and pneumatic systems. The ring's geometry features a sharp cutting edge that, when tightened, bites into the tube surface, creating a metal-to-metal seal and a mechanical grip that withstands vibration and thermal expansion. Each ring is heat-treated to achieve a hardness of HRC 35-40, balancing toughness and wear resistance. The design adheres to ISO 8434-1 and DIN 2353 standards, guaranteeing interchangeability with global fitting systems.

In hydraulic systems, cutting rings are essential for maintaining system integrity under high pressure and dynamic loads. This 6-42mm range covers common tube sizes used in construction equipment, agricultural machinery, and industrial automation. The 316 stainless steel construction makes it suitable for corrosive environments, such as chemical processing plants and offshore applications. The ring's ability to operate from -40°C to 200°C ensures reliable performance in extreme temperatures, from cold storage facilities to engine compartments. Unlike welded or flared connections, cutting rings allow for easy assembly and disassembly without special tools, reducing downtime during maintenance. The precise bite depth control minimizes tube deformation, extending the life of the tubing and reducing the risk of leaks.

Compared to other sizes in the series, this 6-42mm cutting ring offers a versatile balance between flow capacity and compactness. Smaller sizes (6-12mm) are often used in instrumentation and pilot lines, while larger sizes (up to 42mm) handle main hydraulic circuits. This ring's pressure rating of up to 630 bar for smaller sizes exceeds that of many competitor products, providing a safety margin in high-pressure applications. The use of 316 stainless steel instead of 304 offers better resistance to chlorides and acids, making it a preferred choice for marine and chemical environments. Additionally, the ring's hardened surface reduces wear during repeated assembly cycles, ensuring consistent performance over time.

316 stainless steel construction for superior corrosion resistance in harsh environments.
Pressure rating up to 630 bar (for sizes ≤12mm) and 420 bar (for sizes up to 42mm), validated by burst testing.
Compliance with ISO 8434-1 and DIN 2353 ensures global interchangeability and quality assurance.

Core Technical Features and Quantified Advantages

STEP 1

316 Stainless Steel Construction

Made from 316 stainless steel, this cutting ring offers excellent resistance to corrosion, pitting, and crevice corrosion in chloride environments. The material composition includes 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, providing superior performance compared to 304 stainless steel. This makes it suitable for marine, chemical, and pharmaceutical applications where exposure to aggressive media is common. The ring maintains its mechanical properties at temperatures up to 200°C, ensuring long-term reliability.

STEP 2

Pressure Rating up to 630 Bar

For tube sizes up to 12mm, the cutting ring achieves a pressure rating of 630 bar, while larger sizes up to 42mm are rated for 420 bar. These ratings are based on burst testing with a safety factor of 4:1, ensuring safe operation in high-pressure hydraulic systems. The ring's design distributes stress evenly across the tube, preventing deformation and leaks under peak loads. This makes it ideal for applications in construction machinery, hydraulic presses, and oil and gas equipment.

STEP 3

Hardness HRC 35-40 for Durability

The cutting ring is heat-treated to a hardness of HRC 35-40, providing an optimal balance of hardness and toughness. This hardness range ensures the cutting edge can bite into the tube without cracking, while resisting wear during repeated assembly and disassembly. The hardened surface also reduces the risk of galling and extends the ring's service life. Testing has shown that the ring maintains its integrity after 50 assembly cycles, with no significant wear on the cutting edge.

STEP 4

Compliance with ISO 8434-1 and DIN 2353

This cutting ring is manufactured to meet the stringent requirements of ISO 8434-1 and DIN 2353 standards, ensuring dimensional accuracy and interchangeability with fittings from other manufacturers. The standards specify tolerances for the ring's geometry, material properties, and performance testing. Compliance means the ring can be used in systems designed to these standards without modification, reducing inventory complexity and ensuring reliable connections. Each production batch is tested for dimensional conformity and pressure integrity.