Omron NT31 Operation Manuals page 663

Dimensions
Mounting Dimensions
POWER
RUN
652
15.5 (0.61)
145 (5.71)
206 (8.11)
Mounting panel
Mounting fixture
25 (0.98)
5 (0.2)
34 (1.34) (min.)
38 (1.5) (max.)
Units: mm (inch)
APPENDIX B
153 (6.02)