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    M320 Mounting Hole Locations for Open-Frame Racks

    The mounting holes for the adjustable center-mounting brackets are spaced 0.984 in. (25 mm) apart. The adjustable center-mounting brackets have holes for rack-mounting screws, spaced at 3.5 in. (8.89 cm).

    For an open-frame rack, Table 1 specifies the holes in which you insert mounting screws (an X indicates a mounting hole location), and cage nuts if needed. The hole distances are relative to one of the standard “U” divisions on the rack. For reference, the bottom of all mounting shelves is at 0.04 in. (0.02 U) above a U division.

    Table 1: Open-Frame Rack Mounting Hole Locations

    Hole

    Distance Above “U” Division

    Large Shelf

    Small Shelf

    30

    17.26 in. (43.8 cm)

    9.86 U

    X

     

    27

    15.51 in. (39.4 cm)

    8.86 U

    X

     

    24

    13.76 in. (34.9 cm)

    7.86 U

    X

     

    21

    12.01 in. (30.5 cm)

    6.86 U

    X

     

    18

    10.26 in. (26.0 cm)

    5.86 U

    X

     

    15

    8.51 in. (21.6 cm)

    4.86 U

    X

     

    12

    6.76 in. (17.1 cm)

    3.86 U

    X

     

    9

    5.01 in. (12.7 cm)

    2.86 U

    X

     

    6

    3.26 in. (8.3 cm)

    1.86 U

    X

     

    3

    1.51 in. (3.8 cm)

    0.86 U

    X

    X

    2

    0.88 in. (2.2 cm)

    0.50 U

    X

    X

    1

    0.25 in. (0.6 cm)

    0.14 U

     

    X

     
     

    Published: 2010-10-26