Vacuum Services has the capability to repair and service electrical Vacuum feedthroughs to your specification. It is also a cost-effective way to get your equipment back into service.

We also have the facility to machine standard flanges to make a custom combination vacuum feedthrough to suit your project or requirements. Our wealth of experience in manufacturing techniques used to produce these items is your guarantee of unbeatable quality, and our many years of experience in the vacuum technology ensures the high quality needed for UHV applications. All of our Vacuum feedthroughs are TIG welded, the whole assembly is helium leak checked and issued with a certificate of conformity if requested.

Feedthroughs are hermetic, vacuum sealed components and assemblies that have a conductor (wire, pins or solid rod) mounted into a ceramic to metal, glass to ceramic insulator joint to electrically isolate the current carrying conductors from the metallic mounting. They are suitable for high vacuum (HV) and ultra-high vacuum (UHV) environments and temperatures ranging from -270°C to 450°C.

Feedthroughs are used to transport a signal, electrical current, temperature measurement or fibre optic into/from a Vacuum Vessel. Feedthroughs are supplied in weld able or flanged configurations. They are defined by the requirements of the intended use, installation, insulation and conductor material.

  • Feedthroughs for low voltages (up to 12 kV)
  • Water-cooled feedthroughs and RF feedthroughs
  • High-voltage feedthroughs (20 to 100 kV)


Electrical Power Feedthroughs provide transportation of electrical current into and out of a Vacuum Vessel. Electrical Power Feedthroughs are available in a vast variety of vacuum applications, mounting flanges, voltages, and current carrying capacities.

Electrical Feedthroughs are available from in the Voltage & Current range 1-kV 3 A to 8 kV 500 A


Multi-pin Feedthroughs are feedthroughs with two or more conducting pins and are designed to accept a plug on the air side, but some feedthroughs allow for plugs on the vacuum side also.

Hermetically sealed Multi-pin Feedthroughs are designed primarily to provide instrumentation signals, voltage and/or current into/from a High-Vacuum (HV) or Ultra-high Vacuum (UHV) Vacuum Vessel.

  • Voltages up to 12 kV DC
  • Currents up to 40 A
  • Temperature range from -269°C to 450°C
  • Internal pressure 1×10-10 mbar up to 41 bar (600 psig)
  • Up to 50 pins/conductors


Co-axial Feedthroughs are connectors that consist of two concentric conductors: a central inner conductor serves as a current carrying contact and is surrounded by and insulated from an outer tubular conductor that serves as an electromagnetic shield. The outside conductor is usually at ground potential but in some product variations may be floated off ground by employing an additional insulating ring. The outer conducting surface can prevent radio frequency noise from passing to or from the central conductor.

The standard coaxial plug options are BNC, MHV, various SHVs, N, Microdot, SMA, and SMB.

Industry Standard Specifications

  • Grounded shield or floating shield configuration
  • High frequency 50 ? impedance matched connectors as SMA, BNC, Type N and HN
  • Connectors are sold with or without air side plugs


Instrument Feedthroughs are designed to transfer low current, low or high voltage signals from low or high impedance into/from a Vacuum Vessel. They have one or multiple conductors (wire) with a standard electrical plug/socket on the air-side. Some types also are suitable to have connections on the vacuum side.


Thermocouple Feedthroughs are used to measure temperature inside a Vacuum Vessel. Thermocouples are manufactured with differing thermocouple materials or compensating material. The differing materials transmit electromotive force (EMF) generated by the heat application to the thermocouple hot junction (bead joint) transmitted from the inside of a Vacuum Vessel. External temperature measurement controllers evaluate the strength of the electromotive force that is proportional to the temperature at the hot junction and displays the temperature.

Typical ANSI-standardized thermocouple material pairs are listed in the table below.

Thermocouple Type Thermocouple Materials Polarity Measurable Temperature Range (°C)
T Copper Constantan +
-200 to 350
K hromel® Alumel +
-200 to 1250
R/S Platinum 13/10 % Rhodium*
0 to 1450
J Iron
0 to 750
E Chromel®
-200 to 900
C Wolfram 5 % Rhenium
Wolfram 26 % Rhenium
0 to 2315

Contact Vacuum Services Ltd. to discuss your requirements.
Tel: 01424 447726
Email: [email protected]

Vacuum Services Ltd

Unit 5, Haywood Way, Hastings, East Sussex, TN35 4PL England

Phone: +44 (0) 1424 447726

Email: [email protected]

Fax: +44 (0) 1424 447736


Great people, great service, fast delivery, 5 stars!

Tom Bartholomew, Germany

We have been using Vacuum Services for a number of years for a simple reason, their ability to understand and exceed our expectation time after time..

Dr Stevens, Sussex


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