A 1-3/8-inch measurement equals 34.925 mm. The product label alone does not establish whether this is the outside diameter, internal passage or mounting-hole size.
Use the drawing to identify each dimension. The outer flange normally overlaps the mounting opening, so its diameter should not simply be treated as the cutout diameter. Check the groove and panel-thickness range as well as cable clearance.
For custom manufacture, provide a drawing or existing sample and specify the required compound and tolerances. Verify the sample in the intended assembly, including any sealing or vibration requirements.
