KD3-1/8-A-R – Quick Coupling Socket – Festo Couplings

USD $ 21.63

SKU: Festo 531659

Manufacturer Part Number: Festo 531659
Festo Couplings: KD3-1/8-A-R
OEM Spec Ref 

The Festo KD3-1/8-A-R Coupling, with MPN 531659, is a high-quality pneumatic fitting designed to ensure secure and reliable connections within pneumatic systems. This coupling is crafted to provide superior durability and performance in various industrial applications, enhancing both the efficiency and reliability of pneumatic operations.

Key Features:

  • Secure Connection: Engineered for a tight and leak-proof connection, this coupling guarantees a reliable link between pneumatic components, preventing air leaks and maintaining system integrity.
  • High-Quality Materials: Constructed from robust materials, the KD3-1/8-A-R withstands the demanding conditions of industrial environments, ensuring long-lasting durability and resistance to wear and tear.
  • Easy Installation: Designed for simplicity, it allows for quick and straightforward installation, reducing downtime and facilitating efficient assembly or maintenance.
  • Versatile Compatibility: Compatible with a wide range of pneumatic tubes and components, offering great flexibility in system design and retrofit applications.
  • Compact Design: Its compact size ensures that it fits easily in various configurations without requiring additional space, making it ideal for space-constrained applications.


  • Enhanced System Performance: By providing a secure and efficient connection, it helps optimize the flow and pressure within the system, enhancing overall performance and reliability.
  • Reduced Operational Costs: The coupling’s durability and easy installation contribute to lower maintenance costs and reduced downtime, leading to significant cost savings.
  • Increased System Longevity: A secure connection minimizes potential damage and wear to connected components, extending their lifespan and reducing the frequency of replacements.
  • Improved Safety: Reliable connections improve the overall safety of pneumatic systems, preventing leaks and failures that could pose risks to operations and personnel.


  • Manufacturing Facilities: Essential in automated manufacturing lines for connecting pneumatic components securely, ensuring smooth and efficient production processes.
  • Control Systems: Plays a critical role in pneumatic control systems where secure and accurate connections are necessary for proper functionality.
  • Maintenance and Repair: Ideal for routine maintenance and repair operations, where quick and reliable disconnection and reconnection of components are required.
  • General Pneumatics: Suitable for a broad range of pneumatic applications in various industries, enhancing operational precision and reliability through robust and efficient connections.

The Festo KD3-1/8-A-R Coupling stands as a testament to Festo’s commitment to quality and innovation, providing a sophisticated solution for securing pneumatic systems and optimizing the performance and safety of industrial processes. This coupling is an indispensable component in maintaining the integrity and efficiency of pneumatic operations across diverse sectors.

Technical Data

Feature Specification
Nominal width 5 mm
Operating pressure for entire temperature range -0.095 MPa … 1.2 MPa
Operating pressure for entire temperature range -0.95 bar … 12 bar
Operating pressure for entire temperature range -13.775 psi … 174 psi
Operating medium Compressed air as per ISO 8573-1:2010 [7:-:-]
Information on operating and pilot media Operation with oil lubrication possible
Corrosion resistance class (CRC) 1 – Low corrosion stress
LABS (PWIS) conformity VDMA24364-B1/B2-L
Ambient temperature -10 °C … 60 °C
Nominal tightening torque 5 Nm
Tolerance for nominal tightening torque ± 15%
Product weight 28 g
Pneumatic connection 1 External thread G1/8
Note on materials RoHS-compliant
Seals material NBR
Material of spring High-alloy stainless steel
Housing material Brass
Material of threaded seal PA66-GF30/TPE-U
Threaded coupling material Brass
Ball material High-alloy stainless steel
Circlip material High-alloy stainless steel
Valve body material Brass
Material releasing sleeve Brass, nickel-plated
Weight 0.028 kg