DIN 43700 was the specification by the Deutsches Institut für Normung for nominal front- and cut-out dimensions of measurement and control instruments for panel mounting. It was superseded by DIN IEC 61554.
Spec Cutout size 1/2 DIN 192 mm × 96 mm (7.65" × 3.78") 1/4 DIN 96 mm × 96 mm (3.78" × 3.78") 1/8 DIN 96 mm × 48 mm (3.78" × 1.89") 1/16 DIN 48 mm × 48 mm (1.89" × 1.89") 1/32 DIN 24 mm × 48 mm (0.95" × 1.89")
See also List of DIN standards ISO 7736
References