Standard EIA Openings

Standard EIA Openings

EIA — Electronic Industries Association — standardizes features of 19" racks vertical hole spacing, horizontal hole spacing, rack opening and front panel width. The specification also sets tolerances on each of these dimensions.

Standard "Light Duty" Racks - EIA Openings
Rack Height Inches STD. Opening Inches "U" Factor "U" Opening Inches
20 15.63 8 14.13
21 16.63 9 15.88
22 17.63 10 17.63
23 18.63 10 17.63
24 19.63 11 19.38
25 20.63 11 19.38
26 21.63 12 21.13
27 22.63 12 21.13
28 23.63 13 22.88
29 24.63 14 24.63
30 25.63 14 24.63
31 26.63 15 26.38
32 27.63 15 26.38
33 28.63 16 28.13
34 29.63 16 28.13
35 30.63 17 29.88
36 31.63 18 31.63
37 32.63 18 31.63
38 33.63 19 33.38
39 34.63 19 33.38
40 35.63 20 35.13
41 36.63 20 35.13
42 37.63 21 36.88
43 38.63 22 38.63
44 39.63 22 38.63
45 40.63 23 40.38
46 41.63 23 40.38
47 42.63 24 42.13
48 43.63 24 42.13
49 44.63 25 43.88
50 45.63 26 45.63
51 46.63 26 45.63
52 47.63 27 47.38
53 48.63 27 47.38
54 49.63 28 49.13
55 50.63 28 49.13
56 51.63 29 50.88
57 52.63 30 52.63
58 53.63 30 52.63
59 54.63 31 54.38
60 55.63 31 54.38
61 56.63 32 56.13
62 57.63 32 56.13
63 58.63 33 57.88
64 59.63 34 59.63
65 60.63 34 59.63
66 61.63 35 61.38
67 62.63 35 61.38
68 63.63 36 63.13
69 64.63 36 63.13
70 65.63 37 64.88
71 66.63 38 66.63
72 67.63 38 66.63
73 68.63 39 68.38
74 69.63 39 68.38
75 70.63 40 70.13
76 71.63 40 70.13
77 72.63 41 71.88
78 73.63 42 73.63
79 74.63 42 73.63
80 75.63 43 75.38

 

Standard "Medium Duty" Racks - EIA Openings
Rack Height Inches STD. Opening Inches "U" Factor "U" Opening Inches
20 14.56 8 14.13
21 15.56 8 14.13
22 16.56 9 15.88
23 17.56 10 17.63
24 18.56 10 17.63
25 19.56 11 19.38
26 20.56 11 19.38
27 21.56 12 21.13
28 22.56 12 22.13
29 23.56 13 22.88
30 24.56 14 24.63
31 25.56 14 24.63
32 26.56 15 26.38
33 27.56 15 26.38
34 28.56 16 28.13
35 29.56 16 28.13
36 30.56 17 29.88
37 31.56 18 31.63
38 32.56 18 31.63
39 33.56 19 33.38
40 34.56 19 33.38
41 35.56 20 35.13
42 36.56 20 35.13
43 37.56 21 36.88
44 38.56 22 38.63
45 39.56 22 38.63
46 40.56 23 40.38
47 41.56 23 40.13
48 42.56 24 42.13
49 43.56 24 42.13
50 44.56 25 43.88
51 45.56 26 45.63
52 46.56 26 45.63
53 47.56 27 47.38
54 48.56 27 47.38
55 49.56 28 49.13
56 50.56 28 49.13
57 51.56 29 50.88
58 52.56 30 52.63
59 53.56 30 52.63
60 54.56 31 54.38
61 55.56 31 54.38
62 56.56 32 56.13
63 57.56 32 56.13
64 58.56 33 57.88
65 59.56 34 59.63
66 60.56 34 59.63
67 61.56 35 61.38
68 62.56 35 61.38
69 63.56 36 63.13
70 64.56 36 63.13
71 65.56 37 64.88
72 66.56 38 66.63
73 67.56 38 66.63
74 68.56 39 68.38
75 69.56 39 68.38
76 70.56 40 70.13
77 71.56 40 70.13
78 72.56 41 71.88
79 73.56 42 73.63

 

Standard "Heavy Duty" Racks - EIA Openings
Rack Height Inches STD. Opening Inches "U" Factor "U" Opening Inches
20 15.88 9 15.88
21 16.88 9 15.88
22 17.88 10 17.63
23 18.88 10 17.63
24 19.88 11 19.38
25 20.88 11 19.38
26 21.88 12 21.13
27 22.88 13 22.88
28 23.88 13 22.88
29 24.88 14 24.63
30 25.88 14 24.63
31 26.88 15 26.38
32 27.88 15 26.38
33 28.88 16 28.13
34 29.88 17 29.88
35 30.88 17 29.88
36 31.88 18 31.63
37 32.88 18 31.63
38 33.88 19 33.38
39 34.88 19 33.38
40 35.88 20 35.13
41 36.88 21 36.88
42 37.88 21 36.88
43 38.88 22 38.63
44 39.88 22 38.63
45 40.88 23 40.38
46 41.88 23 40.38
47 42.88 24 42.13
48 43.88 25 43.88
49 44.88 25 43.88
50 45.88 26 45.63
51 46.88 26 45.63
52 47.88 27 47.38
53 48.88 27 47.38
54 49.88 28 49.13
55 50.88 29 50.88
56 51.88 29 50.88
57 52.88 30 52.63
58 53.88 30 52.63
59 54.88 31 54.38
60 55.88 31 54.88
61 56.88 32 56.13
62 57.88 33 57.88
63 58.88 33 57.88
64 59.88 34 59.63
65 60.88 34 59.63
66 61.88 35 61.38
67 62.88 35 61.38
68 63.88 36 63.13
69 64.88 37 64.88
70 65.88 37 64.88
71 66.88 38 66.63
72 67.88 38 66.63
73 68.88 39 68.38
74 69.88 39 68.38
75 70.88 40 70.13
76 71.88 41 71.88
77 72.88 41 71.88
78 73.88 42 73.63
79 74.88 42 73.63
80 75.88 43 75.38