DIN 43700
Encyclopedia
DIN 43700, is a specification by the Deutsches Institut für Normung
Deutsches Institut für Normung
is the German national organization for standardization and is that country's ISO member body. DIN is a Registered German Association headquartered in Berlin...

for nominal front- and cut-out dimensions of measurement and control instruments for panel mounting.
spec cutout size
1/2 DIN 5.40" x 5.40" [138 mm x 138 mm]
1/4 DIN 3.64" x 3.64" [92 mm x 92 mm]
1/8 DIN 3.64" x 1.78" [92 mm x 45 mm]
1/16 DIN 1.78" x 1.78" [45 mm x 45 mm]
1/32 DIN 0.874" x 1.77" [22.5 mm x 45 mm]
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