This is defined in SMPTE standard S149-2004. I can’t upload it here because it is copyrighted but here are the dimensions stated therein. The first number is in inches. The second number is in millimeters.
Film width 0.3140 ± 0.0015 7.976 ± 0.038
Perforation pitch (long) 0.1667 ± 0.0004 4.234 ± 0.010
Perforation pitch (short) 0.1664 ± 0.0004 4.227 ± 0.010
Perforation width 0.0360 ± 0.0004 0.914 ± 0.010
Perforation height 0.0450 ± 0.0004 1.143 ± 0.010
Edge to perforation 0.020 ± 0.002 0.51 ± 0.05
100 consecutive perforation pitches 16.670 ± 0.017 423.42 ± 0.43
100 consecutive perforation pitches 16.640 ± 0.017 422.66 ± 0.43
Radius of perforation fillet 0.005 ± 0.001 0.13 ± 0.03