Definitions for "Concentricity"
When the parts share the same center line they are concentric to each other.
The degree to which the geometric centerpoints—particularly of the core and cladding of a fiber—coincide.
Adherence of part features to a common axis.
Keywords:  hplc, thru, centerline, bore, tube
See Tube Measurement Terms.
In HPLC, the degree to which the thru-hole of a part has a common centerline with the part. This is critical when aligning small-bore tubing with a union's thru-hole. If the thru-hole is not concentric, the flow path may be restricted.
The state of being concentric.