Normalized tube record

0.512 in OD tube

A measured tube group centered on 0.512-inch outside diameter. It is separated from nominal drill-size classes until a verified equivalence is recorded.

0.512 in OD

Observed outside diameters0.512" (13.0 mm)

Known kit lengths3

Linked kits / projects6

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

Churchill FP pen kitsXiamen Rizheng · RZ-FP71Upper / capbarrel position0.512" (13.0 mm)tube OD1.693" (43.0 mm)tube lengthNot recordedminimum blank cutOpen kit →Churchill RB pen kitsXiamen Rizheng · RZ-RP71Upper / capbarrel position0.512" (13.0 mm)tube OD1.693" (43.0 mm)tube lengthNot recordedminimum blank cutOpen kit →Keychain Lighter chain kitsXiamen Rizheng · RZ-PK457Lower / bodybarrel position0.512" (13.0 mm)tube OD0.787" (20.0 mm)tube lengthNot recordedminimum blank cutOpen kit →Noble fountain pen kitsXiamen Rizheng · RZ-FP211Upper / capbarrel position0.512" (13.0 mm)tube OD1.693" (43.0 mm)tube lengthNot recordedminimum blank cutOpen kit →Noble rollerball pen kitsXiamen Rizheng · RZ-RP211Upper / capbarrel position0.512" (13.0 mm)tube OD1.693" (43.0 mm)tube lengthNot recordedminimum blank cutOpen kit →Tactical twist pen kits outdoorXiamen Rizheng · RZ-BP292Upper / capbarrel position0.512" (13.0 mm)tube OD2.059" (52.3 mm)tube lengthNot recordedminimum blank cutOpen kit →