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

Type N Feedthroughs Cabling Instructions & Specifications

  • Use 304 stainless steel as conductor material
  • Feature grounded shields
  • Single-ended feedthroughs have a connector only on the air-side of the mounting (though push-on connectors for the vacuum-side are available as optional extras)
  • Double-ended feedthroughs come with connectors on the air- and the vacuum-side.
  • All feedthroughs include cable connectors

Specifications Table

Impedance48–52 ohms (For Unmatched Models Only)
50 ohms (For Matched Models Only)
Conductor MaterialStainless Steel
Insulator MaterialAlumina
CableRG-8U, RG-9U, RG-10U
ConnectionScrew Thread
Vacuum ApplicationHV or UHV
Temperature Range
(for metal seals)
Weld adapter, CF: -200°C to +450°C
Temperature Range
(for elastomer seals)
KF, O-Ring, NPT: To +150°C
Temperature Max. Ramp Rate25°C / Minute
Temperature Range
(cable connectors)
-65°C to +165°C
Max. Voltage
(for grounded shields)
500V DC
Max. Current3A

NOTE: An ‘‘M’’ in the last position of the part number indicates models rated to 50-ohms impedance.

Type N Feedthroughs Cabling Instructions

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1) Slide nut and gasket over cable jacket. Cut and strip jacket to 0.28".

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2) Comb out the braid and fan out radically. Cut and strip dielectric to expose 0.16 inches of conductor. Do not nick conductor.

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3) Pull braid forward and taper toward conductor, then slide clamp over braid (tapered end first), and bottom out against cable jacket.

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4) Fold braid back over clamp to 0.13". Wet conductor using a non-acid core 60–40 tin–lead solder. Then slide contact on and solder in place. Do not overheat cable dielectric because it may swell and prevent insertion of the cable into the shell.

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5) With gasket properly seated on clamp, slide cable assembly into shell as far as it will go. Slide nut into shell and screw in place with wrench until tight. Make sure to hold cable and shell rigid while rotating nut.

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