LEMO M Series Ratchet Coupling Connectors

LEMO M Series Ratchet Coupling Connectors provide a screw coupling system that enables a quick, secure coupling of the connectors for high vibration environments. When mated, these connectors are watertight to 2 meters for 15 hours, achieving an IP68 rating. The plugs come with two grip designs: a standard knurl grip or an arctic grip to allow secure mating while wearing gloves. Receptacle styles include jam-nut or flange panel mount with crimp contacts, PCB pins, or in-line cable mount shells. The M series delivers 360° shielding and high shell conductivity to ensure excellent EMI protection. The overmold feature provides additional strain relief, ensuring cable mount reliability. LEMO M connectors are designed for energy, alternative energy, industrial automation, performance automotive, and other harsh environment applications that require robust performance in a lightweight and compact size.


  • Vibration resistant - vibration tends to tighten, not loosen
  • Quick-mating - 1/2 turn to seat
  • Excellent EMI protection - full 360° shielding and high shell conductivity
  • IP68 - watertight to 2 meters for 15 hours
  • Oil and gas resistant
  • Single grip, standard knurl grip, or arctic grip for use while wearing gloves
  • Laser engraved with a batch number to ensure complete traceability


  • Avionic control and sensors
  • Robotics and remote controls
  • Hybrid and electric vehicles
  • Motorsports
  • Batteries and fuel cells
  • Communications radios
  • Health monitoring
  • Data fill devices
  • Field use rugged medical equipment
  • Modems and system modules
  • Man-pac electronics
  • Navigation systems
  • Night vision devices
  • Security and surveillance
  • Video camera and terminals
  • Unattended sensors
Published: 2009-10-26 | Updated: 2022-12-02