GD&T Straightness Application Thin Wall Tube. This video instructions on how to tolerance design for a line to line fit between the tube and the mating diameter.
Straightness is a condition where an element of a surface or axis is a straight line. Straightness is a form tolerance and does not allow a datum reference.
https://www.engineersedge.com/calculators/gdt_straightness_tolerance_16618.htm
