TATurner's AtlasPen tube size library

Tube guide/0.551 in OD tube

Normalized tube record

0.551 in OD tube

A measured tube group centered on 0.551-inch outside diameter. It is separated from nominal drill-size classes until a verified equivalence is recorded.

0.551 in OD
Observed outside diameters0.551" (14.0 mm)
Known kit lengths1
Linked kits / projects2
Replacement listings0
Before substituting

Match OD, wall thickness, and length.

The class name helps discovery; it does not override the kit maker's current tube specification. A close drill size does not prove that two brass tubes are interchangeable.