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

SMA Feedthroughs Cabling Instructions & Specifications


  • Feature grounded or floating shields
  • Include air-side cable connectors
  • Vacuum-side, push-on connectors available as accessories on single-ended versions only
  • Double-Ended versions are available
  • 50 ohm Matched units rated to 8GHz are available

Specifications Table

Impedance48–52 ohms
Conductor MaterialStainless Steel
Insulator MaterialAlumina
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 floating shields)
Shield-Ground: 2500V DC
Shield-Pin: 700V DC
Max. Voltage
(for grounded shields)
700V DC
Max. Current1A

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

CSMA Feedthroughs abling Instructions


1) Slide nut and washer over cable jacket. Cut and strip jacket, exposing braid by 0.27"


2) Comb out the braid and taper forward toward conductor, then slide clamp over braid until it bottoms out on cable jacket.


3) Fold braid wires back over clamp and trim as necessary, so they are clear of clamp shoulder.


4) Cut and trim dielectric, exposing conductor to 0.13". Do not nick conductor. Wet conductor using a non-acid core 60–40 tin–lead solder. Do not overheat.


5) Slide contact onto conductor and solder in place, holding it squarely against dielectric. Remove excess solder. Do not overheat cable dielectric. Overheating may cause swelling, which may prevent insertion of cable into shell.


6) Slide cable assembly into shell as far as it will go. Slide nut into shell and screw in place with wrench until tight. Hold cable and shell rigid while rotating nut.