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Feedthroughs & Viewports > Electrical Feedthroughs > Coaxial Feedthroughs > Cabling Instructions for Feedthroughs

Multi-Pin/Threaded (MPT) Feedthroughs Cabling Instructions & Specifications


  • 3 to 7 pins
  • Feature a threaded connector
  • Used for low current applications up to 500V
  • Available only as single-ended feedthroughs
  • Includes air-side cable connector

Specifications Table

Conductor MaterialNickel: Clad Molybdenum
Insulator MaterialAlumina
ConnectionScrew Thread
Vacuum ApplicationHV or UHV
Temperature Range
(for metal seals)
Weld adapter, CF: RT to +450°C
Temperature Range
(for elastomer seals)
KF, O-Ring, NPT: -40 °C to +150°C
Temperature Max. Ramp Rate25°C / Minute
Max. Current3.5A (Per Pin)
20A (All Pins*)
Max. Voltage500V
Number of Pins3-7
Air-Side Connector 0° to +35°C
Vac-Side Connector
(PEEK Insulation)
200K to +450°C

* For feedthrough in the group with the most pins and all pins loaded.

MPT Connectors, Low-Current (Threaded) Cabling Instructions


1) Slide strain-relief spring and shell over cable. Strip cable and individual conductors as shown. Wet conductor with 60–40 tin–lead solder.


2) Slide heat-shrink insulation over each conductor. (Not required with 5- and 7-pin connectors.) Coil each conductor to fit over contacts. Solder in place using 60–40 tin–lead solder. Contacts on 5- and 7-pin connectors should be bent in slightly to enable fitting of the coiled conductors. If conductors are not suitable for coiling, use straight lap with adequate solder.


3) Slide heat-shrink cable insulation over each solder joint, covering all exposed metal (not required with 5- and 7-pin connectors.) Heat and shrink insulation at approximately 135° C.


4) Slide shell over contact assembly. Align shell and contact assembly holes and fasten front set screw (for clarity, set screws are illustrated on same side; however, they are actually on opposite sides of the shell.) Slide strain relief spring into shell and fasten rear set screw. Pin connectors 5 and 7. Use a threaded adapter to fasten strain relief spring.