Contracting Rings

This is the most widely used configuration.  These rings are delivered in the expanded condition and contract about 5% in diameter when heated.  Shrink temperatures range from -120°C to +125°C, depending on the alloy used.  Rings are fabricated with a machined rectangular cross section or made by forming and welding round wire.

Expanding Rings 

These rings expand in diameter when heated, rather than contracting.  Expansion is about 2.25% on the outside diameter.  Consider these a last resort for applications where a contracting ring cannot be designed in.  These are available on a custom basis only.  They are not available in Alloy C.

Tensioning Rods 

Rods contract about 5% in length when heated.  Various threaded and button head configurations are possible.  Available in all alloys on a custom basis.   These are most frequently specified in Alloys G or N for use as high force single cycle actuators.  Multi-cycle applications are possible, though the stroke and the loading must be de-rated.

Expanding Pins

These plain cylindrical pins expand about 2.25% in diameter when heated.  They are typically used as zero insertion force dowel pins or as hole plugs in high pressure or restricted access applications.  The pins are intended for permanent installation.  They are available in Alloy H only.

Expanding Washers 

These thick washers expand in length along their axis when heated.  The primary application is load and unload bolted joints in response to ambient temperature.  They are typically produced in Alloys F, D, B, G or N. 

Custom NiTi Alloy Devices 

We can produce other shapes using our standard alloys.  Let us know what you need.