Especially the copy of the SMPTE document look trustworthy:
Film width : 7.976 mm +- 0.038 mm
Perforation pitch (long): 4.234 mm +- 0.010 mm
Perforation pitch (short): 4.227 mm +- 0.010 mm
Perforation width: 0.914 mm +- 0.010 mm
Perforation height: 1.143 mm +- 0.010 mm
Edge to Perforation: 0.51 mm +- 0.05 mm
English: Super 8 and 8 mm film formats side by side. Magnetic stripes are indicated in gray; the wide stripe is the actual sound track, the narrow stripe is a "balance" stripe, enabling smooth movement and rolling-up of the film.
Deutsch: Super 8 und 8 mm Filmformate nebeneinander. Die Magnetstreifen sind grau dargestellt; der breite Streifen ist die Tonspur, der schmale Streifen ein "Ausgleichsstreifen", der ein reibungsloses Bewegen und Aufrollen des Films ermöglicht.
Date
Source
Own work
Author
Myself (Max Smith) (Error fix & Mag stripes by User:Janke)
Release all rights into the public domain, but an image credit would be nice
Sizes taken from various (inconsistent) sources - if you have better numbers - please drop a note on my source page.
Licensing
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.