This standard specifies the dimensions and characteristics of day-loading film holders for 16mm motion picture films with capacities of 15m (50ft), 30m (100ft), 60m (200ft), and 120m (400ft). The film holder of a high-speed camera should ensure balance, but this standard does not apply to high-speed cameras.
JB/T 6168-2007 Referenced Document
GB/T 19523 Micrographics-16mm and 35 mm microfilm spools and reels-Specifications
JB/T 6168-2007 history
2007JB/T 6168-2007 Spools, daylight loading type for 16mm motion-picture cameras. Dimension