What are the parts of a spring-joint caliper?

 
 
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Labelled diagram showing the parts of a spring joint caliper.
 
   

Spring

 
 
The legs of the caliper are joined together with a circular spring at the top of the tool.
 

The legs of the caliper are joined together with a circular spring at the top of the tool. 

 
     
   

Adjusting nut and threaded rod

 
 When the adjusting nut is twisted, the nut and threading rod work together to compress or expand the spring which opens or closes the legs of the caliper. 

When the adjusting nut is twisted, the nut and threading rod work together to compress or expand the spring which opens or closes the legs of the caliper.

 
     
   

Legs

 
 The legs are the measuring faces of the caliper. The distance between them is adjusted when the nut is twisted. 

The legs are the measuring faces of the caliper. The distance between them is adjusted when the nut is twisted.

 
     
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