SRX300 Services Gateway Spacing of Mounting Brackets and Flange Holes
The spacing of the mounting brackets and flange holes on the rack and device mounting brackets are as follows:
The holes within each rack set are spaced at 1 U (1.75 in. or 4.5 cm).
The mounting brackets and front-mount flanges used to attach the chassis to a rack are designed to fasten to holes spaced at rack distances of 1 U (1.75 in.).
The mounting holes in the mounting brackets provided with the device are spaced 1.25 in. (3.2 cm) apart (top and bottom mounting hole).