SRX550 Services Gateway Spacing of Mounting Bracket 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 2U (3.5 in. or 8.89 cm). The services gateway can be mounted in any rack that provides holes or hole patterns spaced at 1U (1.75 in. or 4.5 cm) increments.
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 2U (3.5 in.).
The mounting holes in the mounting brackets provided with the device chassis are spaced 1.25 in. (3.2 cm) apart, measured from the center of each hole.