The mounting holes in the mounting brackets provided with the J2300 Services Router chassis are spaced 1.25 in. (3.2 cm) apart, measured from the center of each hole.
The mounting holes in the mounting brackets attached to the J4300 and J6300 chassis are spaced in two groups. The space between the holes in each group is 0.6 in. (1.5 cm) apart, measured from the center of each hole. The space between the two groups is 1.75 in. (4.4 cm) apart, measured from the center of the lower hole in the top group to the upper hole in the bottom group.