19 Inch Rack Cases – General Properties

Horizontal Dimensions

The width of 19" equipment is obviously 19 inches = 482.6 mm. However, the question is: what distance is that? Wikipedia helps us: The 19 inch are "including edges or ears that protrude on each side which allow the module to be fastened to the rack frame". So for most devices, it is the width of their front panel.

The distance between the screws is defined to be: 18 5/16 in = 465.14 mm.

The clearance is 71/4 in = 450.85 mm.

Vertical Dimensions

1 height unit is: 1.75 inches (44.45 cm).
Front panels are usually about 1/32 inch (0.787 mm) smaller than that.

Height Units Inches mm
1 1 3/4 44.45
2 3 1/2 88.90
3 5 1/4 133.35

Threads

The threads are usually:

  • UNF threads #10-32 (~ 4,826 mm),
  • or UNC threads #12-24 (~ 5,486 mm)
  • or 1/4″ (20 tpi)

Comments