Xem Studiomeasured geometry19-inch rack units and mounting ears (EIA-310)
What are 1U rack mount dimensions? · Hardware · basis: EIA-310-D / IEC 60297: 19 in rack, 1U = 44.45 mm, hole spacing 15.875 / 15.875 / 12.7 mm, mounting rails 465.1 mm apart
- sizes
- 7 in table
Notes
- 1U = 44.45 mm (1.75 in). Equipment height is 1U minus about 0.8 mm so panels don't bind: a 1U faceplate is 43.6 mm tall; 2U is 88.1 mm.
- Hole pattern per U: 6.35 / 22.225 / 38.1 mm from the U boundary (15.875-15.875-12.7 repeating). Rail-to-rail inside width 450.85 mm; hole centres 465.1 mm apart; faceplate width 482.6 mm (19 in).
- Cage nuts take 9.5 mm square holes (M6 or 10-32 screws); threaded rails are usually 10-32 or M6.
- Files are ear test plates with the slot pattern for 1U and 2U.
Sizes
| dimension | mm |
|---|---|
| 1U | 44.45 |
| 1U faceplate height | 43.6 |
| hole offsets within a U | 6.35, 22.225, 38.1 |
| rail hole centres (width) | 465.1 |
| inside rail width | 450.85 |
| faceplate width | 482.6 |
| cage nut square hole | 9.5 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | 19-inch rack | web | CC BY-SA 4.0 (text) |
| Wikipedia | Rack unit | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| rack-ear-1u | 1U rack ear test plate: 44.45 mm per U, slots at 6.35 / 22.225 / 38.1 | STEP · STL |
| rack-ear-2u | 2U rack ear test plate: 44.45 mm per U, slots at 6.35 / 22.225 / 38.1 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=rack-19in-ears
Fits with
Questions
How tall is 1U?
44.45 mm (1.75 in). Make a 1U panel 43.6 mm so it clears the neighbours; 2U panels are 88.1 mm.
What is the 19 inch rack hole spacing?
Three holes per U at 6.35, 22.225 and 38.1 mm from the U boundary (gaps of 15.875, 15.875, 12.7 mm); the two rails' hole centres are 465.1 mm apart.
What size are rack screws?
10-32 in most US racks, M6 in most EU racks and with cage nuts; the cage-nut hole is 9.5 mm square.