Normalized tube record

0.339 in OD tube

A measured tube group centered on 0.339-inch outside diameter. It is separated from nominal drill-size classes until a verified equivalence is recorded.

0.339 in OD

Observed outside diameters0.339" (8.6 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.

Kit cross-reference

Known barrel lengths

AMC classic twist pen kitsXiamen Rizheng · RZ-BP115Upper / capbarrel position0.339" (8.6 mm)tube ODNot recordedtube lengthNot recordedminimum blank cutOpen kit →AMC classic twist pen kitsXiamen Rizheng · RZ-BP115Lower / bodybarrel position0.339" (8.6 mm)tube ODNot recordedtube lengthNot recordedminimum blank cutOpen kit →Secret top pen kitsXiamen Rizheng · RZ-BP47Upper / capbarrel position0.339" (8.6 mm)tube OD3.031" (77.0 mm)tube lengthNot recordedminimum blank cutOpen kit →