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An atherm temperature-sensitive bellows assembly has been manufactured and supplied by Abssac as part of its controlled electroform component programme.

These lightweight, sensitive assemblies are thin-walled, electrodeposited nickel bellows soldered to custom end pieces filled with a working fluid (with a known coefficient of thermal expansion) and then sealed.

By sealing a specific volume of fluid within a electrodeposited nickel bellows, the volumetric thermal expansion characteristic of the fluid is transformed into a precise, measurable linear movement.

This movement can be used as an actuator, or calibrated to be read as control data, and is completely reversible due to the extremely low hysteresis of the bellows material.

The atherm is currently being used in one defence application to compensate for the thermal growth of components within precision targeting devices.

The response of the bellows ensures that the targeting image is not distorted by environmental changes in temperature from sub-zero to extreme desert heat conditions.

These athermalisation bellows assemblies are designed, manufactured and assembled to the customers exacting specifications.

In a nut shell…. For well over 25 years, we have been a company that provides engineering support to all of the products we supply, teamed up with exceptional customer service. Our professional and honest approach to business is often commented on as one of our key advantages. Situated in the Vale of Evesham, Abssac supplies rotary and linear power transmission products.


Through a dedicated and knowledgeable sales team, our product portfolio incorporates all types of flexible shaft couplings such as helical beam, cross-slot, metal bellows, elastomeric, metal disc, gear and solid designs. Our extensive precision linear products include lead and ball screws in rolled, whirled, machined and ground formats, which are complimented by a large range of anti-backlash nut designs. Finally and perhaps where we excel the most, our specialist product ranges which include the unique machined spring product and precision electro-deposited forms. In many cases, our ability to quickly adapt a standard program part into a key component has enhanced product designs around the world.


Established in 1982, we are a Quality Assurance BS EN ISO9001: 2000 approved company.

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