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

SMB Feedthroughs Cabling Instructions & Specifications


  • Made of 416 stainless steel
  • Features floating or grounded shields
  • Feedthroughs have air-side cable connectors (vacuum-side, push-on connectors available as accessories)

Specifications Table

Conductor MaterialStainless Steel (Type 416)
Insulator MaterialAlumina
ConnectionPush Clip
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)
-200°C to +450°C
Max. Voltage
(for floating shields)
Shield-Ground: 1000V DC
Shield-Pin: 500V DC
Max. Voltage
(for grounded shields)
500V DC
Max. Current1A

SMB Feedthroughs Cabling Instructions


1) Slide grip sleeve over cable jacket. Cut and strip cable jacket, braid, and the dielectric to dimensions indicated in drawing. Make all cuts square. Do not nick braid, dielectric, or center conductor. Wet conductor using a non-acid core 60–40 tin–lead solder. Do not overheat.


2) Flare braid slightly, but do not fray. Slide nut onto cable so that stem slides under braid. Push until dielectric bottoms out inside nut.


3) Slide grip sleeve forward over braid and butt against nut. Remove all slack in braid. Crimp grip sleeve, keeping cable dielectric bottomed out inside nut. Slide contact in place using non-acid flux. Do not get solder on outside surface of contact.


4) Slide insulator over contact, then slide cable assembly into shell. Screw together with wrench, holding cable assembly stationary while rotating shell.