Alloy 260， Fittings，UNS N03260,E FORU

British Specs:，American Specs: AMS 5890 Bar and Forgings，German Specs:

### **Product Datasheet: Alloy 260 (Cartridge Brass, 70/30) Fittings** **UNS Designation:** UNS C26000 **Common Names:** Cartridge Brass Fittings, 70/30 Brass Fittings #### **1. Overview** Alloy 260 fittings represent the premium choice for plumbing, hydraulic, and pneumatic systems requiring superior corrosion resistance and reliable performance. As a wrought copper-zinc alloy with a nominal 70/30 composition, these fittings offer exceptional machinability and formability, making them ideal for complex fitting geometries. The alloy's inherent ductility allows for easy installation through soldering, brazing, or mechanical joining methods, while maintaining excellent pressure integrity and long-term service reliability in various fluid handling applications. #### **2. Key Characteristics** * **Excellent Machinability:** 100% machinability rating enables cost-effective production of complex fitting geometries * **Superior Corrosion Resistance:** Excellent performance in potable water, heating, and general service applications * **Good Pressure Tightness:** Reliable sealing capabilities for pressurized systems * **Ease of Installation:** Compatible with soldering, brazing, and threaded connection methods * **Excellent Thermal Conductivity:** Ideal for heating system applications * **Good Mechanical Properties:** Balanced strength and ductility for reliable service * **Antimicrobial Properties:** Inherent bacteriostatic characteristics suitable for potable water systems ***Service Note:*** *While offering good general corrosion resistance, Alloy 260 fittings may be susceptible to dezincification in soft or slightly acidic waters. For critical applications, dezincification-resistant brass alloys are recommended.* --- #### **3. Chemical Composition (Weight % - ASTM B16/B62 Specifications)** | Element | Content (%) | | :--- | :--- | | Copper (Cu) | 68.5 - 71.5 | | Zinc (Zn) | Remainder | | Iron (Fe) | ≤ 0.05 | | Lead (Pb) | ≤ 0.09 | | Other Elements (Total) | ≤ 0.15 | *The controlled lead content ensures compliance with modern potable water standards while maintaining necessary machinability for fitting production.* --- #### **4. Physical Properties (Typical)** | Property | Value | | :--- | :--- | | Density | 8.53 g/cm³ (0.308 lb/in³) | | Melting Point (Liquidus) | 955 °C (1750 °F) | | Melting Point (Solidus) | 915 °C (1680 °F) | | Thermal Conductivity | 120 W/m·K | | Coefficient of Thermal Expansion | 20.2 × 10⁻⁶/°C (20-300°C) | | Modulus of Elasticity | 110 GPa (16 × 10⁶ psi) | --- #### **5. Mechanical Properties (Typical for Fitting Applications)** | Property | Value Range | | :--- | :--- | | Tensile Strength | 340 - 480 MPa (49 - 70 ksi) | | Yield Strength (0.5% Offset) | 125 - 310 MPa (18 - 45 ksi) | | Elongation | 15 - 50% | | Hardness (Rockwell B) | 55 - 80 HRB | | Maximum Service Temperature | 200°C (392°F) | --- #### **6. International Standards** Alloy 260 fittings comply with these international specifications: * **ASTM (USA):** * **ASTM B62:** Copper Alloy Sand Castings for General Applications * **ASTM B16:** Free-Cutting Brass Rod, Bar and Shapes * **ASME (USA):** * **ASME B16.15:** Cast Bronze Threaded Fittings * **ASME B16.18:** Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings * **EN (European Norm):** * **EN 1254:** Copper and copper alloys - Plumbing fittings * **EN 1982:** Copper and copper alloys - Ingots and castings * **DIN (Germany):** * **DIN 17660:** CuZn30 (CZ106) * **ISO:** * **ISO 9001:** Quality management systems * **ISO 4144:** Non-alloy steel and copper alloy pipe fittings --- #### **7. Product Applications** Alloy 260 fittings serve critical roles across multiple industries: * **Plumbing & Heating Systems:** * Potable water distribution fittings * Heating system connectors and adapters * Residential and commercial plumbing fixtures * **HVAC & Refrigeration:** * Refrigerant line fittings * Cooling water connectors * Heat exchanger connections * **Industrial Fluid Systems:** * Compressed air line fittings * Low-pressure hydraulic connectors * Process water system components * **Marine Applications:** * Marine plumbing systems * Boat water and fuel line connectors * Offshore platform fluid handling * **General Industrial:** * Instrumentation tubing connectors * Pneumatic control system fittings * Irrigation system components --- #### **8. Disclaimer** This technical information is provided for reference purposes only. Actual fitting performance may vary based on manufacturing processes, installation methods, and service conditions. Users must verify compliance with applicable local codes and standards for specific applications. The manufacturer's installation guidelines and pressure rating specifications should always be followed to ensure system safety and reliability. Consult with qualified engineers for critical applications or unusual service conditions.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2815 gallon liquid totes Special package is available on request.