Abstract: A mine roof support plate having a rigid sheet steel body of uniform thickness wherein a ribbed domed section reinforces the plate against distortion. The domed section is of generally frusto-conical configuration and defines a central section having an opening therein surrounded by a generally planar surface. The periphery of the plate is of planar rectangular configuration and disposed in spaced parallel relationship to the central section. Reinforcing ribs are formed in and extend radially across the domed section to merging intersection with the planar periphery of the plate.