Servometer© electroforms are a formidable product package.

As the sole United Kingdom distributor, Abssac can supply  quality-crafted bellows, couplings, electroforms, and electrical contacts. For those engineers familiar with the traditional electroforming process we are offering a new way of looking at both complexity of shape, wall thickness tolerance, integral strength and capability. 

The process begins with a piece of aluminium stock or bar. Next the internal geometry of the electroform is machined into the aluminium to produce a mandrel. After inspection, nickel, copper, gold, silver or combinations there of are electrodeposited onto the mandrel to a precise wall thickness. Following a post plate inspection the plated mandrel is trimmed to produce the desire end configuration and dimensions. Finally, the aluminium mandrel is then dissolved in a caustic solution leaving behind the completed electroform. At this point special finishes or coatings may be applied.


Why not visit the Servometer© site for further product information and news;



The technology Servometer© offers can and has been used on a hole range of applications in aerospace, medical equipment, electronic chip manufacture, microwave applications, cryogenic cooling and PCB automatic testing activity to name a few.

Servometer© quality is of the best and where the miniature metal bellows are concerned there are none that compete with bellow diameters under 6mm and on request we can supply down to diameters of 0.07mm.

Some advantages of our electroforms:

  • Light weight combined with high toughness Limitless geometries are possible, even with varying cross sections
  • They can be manufactured with varying wall thickness in a single part
  • Electroforms can be made integral with our bellows, eliminating the need for welding or soldering
  • Diameters as small as 0.020 in.
  • Close internal tolerances
  • Suitable for extreme temperatures as low as -423°F below zero
  • We can supply electroforms which range from 0.020 in. to 8 in. cross section.
  • Even larger parts are possible, for certain geometries.
  • Typically, our electroforms are nickel, but copper and gold are also available, as a complete part, as a lamina or as a surface finish.
  • Mirror finishes and low reflectance coatings can be provided as required.


Servometer© also offer a range of efficient precision assembly services that reduce component costs, lead-times, and sustain quality. We specialise in soldering, induction brazing, electron-beam welding and adhesive bonding. Evacuated assembly, hermetic sealing and back-fill operations routinely produce precision temperature and pressure sensitive devices.Our sub assembly capabilities, combined with necessary leading-edge technologies, will get your job done exactly right - on spec, on time, every time.


  • Get a specialised job done right
  • Focus on core competencies
  • Reduce parts count
  • Simplify assembly, purchasing, and scheduling
  • 1 Reduce scrap rate on high added-value parts
  • Improve process control
  • Reduce total part costs

Electroform - Volumetric

Servometer© custom electroforms can be used as extremely precise volume changing devices.

For example; as a volume compensator, the electroformed part can compensate for the changes in volume of a fluid in a sealed container. A bellows volume compensator is in effect a controlled precision bubble, which will change its volume to compensate for the changes in the fluid volume. Likewise, the same electroform can also be used as athermalization assembly - which accurately converts temperature change in to a predicted linear motion.

By filling a custom bellows assembly with an engineered fluid with a known coefficient of expansion, allows the expansion and or contraction, to compress or extend the bellows translating the motion into an accurate linear deflection.

For further details, why not contact our sales engineers who will be happy to discuss your application.


Electroforms - Gold

Drawing upon over 40 years of experience, a new patent pending electroforming technology allows us to now supply solid gold electroforms. Electrodeposited products are formed by machining a precision mandrel to the shape of the desired form and then depositing the correct thickness of quality metal on to the mandrel. The mandrel is then dissolved away leaving the precision finished product behind.

Enabling the use of gold within applications has allowed some remarkable properties of the material to be exploited. For example, gold is the most non-reactive of all metals. It is benign in all natural and industrial environments. Gold does not react with oxygen, which means it will not oxidise or tarnish. Gold is among the most electrically conductive of all metals and is able to convey even a tiny electrical current in temperatures varying from -55° to +200° centigrade. Gold is also the most reflective and least absorptive material of infrared (or heat) energy. High purity gold reflects up to 99% of infrared rays but is it also an excellent conductor of thermal energy or heat. Lastly, Gold is ideal for invasive or implantable medical devices as it is one of the least rejected materials in the human body. This unique combination of properties makes gold a vital component in many medical, industrial, and electrical applications.

By refining the gold electroforming technique we can supply extremely intricate parts with unusual shapes, thin walls, deep crevices and other design features. The electroforming process is especially crafted for tolerance-critical miniature parts and makes them suitable for both flexible bellows and rigid electroformed components.The controlled electroforming process can also vary the wall thickness in different places on the same part for selective rigidity and flexibility allowing hollow parts with walls as thin as 0.0127mm (0.0005inch) for miniature applications including electrical bellows contacts and precision instrument applications.

Interconnect Gold Contacts

 Abssac has supplied bellows spring contacts where the connection cannot or should not be permanent, particularly when the parts are to be connected, separated and re-connected. The two types of spring contacts best suited for these applications are gold-plated wire mesh cylinders and gold-plated miniature metal bellows. Typical applications include: diodes, delay lines, waveguide components, and printed circuit boards.Our bellows type contact springs are manufactured from electrodeposited nickel alloy, and gold plated according to ASTM B 488-01 to enhance their conductivity. They are flexible and dynamic, and designed to provide a lifetime of reliable interconnection. Furthermore, they can help overcome tolerance buildup and thermal expansion problems in critical assemblies.

Follow these links for individual pages for each standard electrical contacts and interconnectric contacts.



  • Minimal self inductance
  • Extremely low DC resistance
  • Minimal insertion loss
  • Lifetime spring repeatability
  • Only small forces are required for compression
  • Seamless and non-porous
  • Can be as small as .020 inch (0.5mm) in diameter

For high frequency applications,  bellows contacts have low losses ranging from .20 dB to .45 dB at 6 GHz with a total bandwidth much higher. The above information gives you a concise overview of the product capabilities. If you require more detailed information please feel free to contact our sales engineers, who will be more than happy to help.

Alternatively, further examples of where the unique Servometer© product has been utilsed can be found by using the button below;


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