1U Standard Chassis Mounting Hole Spacing
Holes are grouped in sets of three, with each group representing one Rack Unit, commonly called 1U. The spacing is measured center-hole to center-hole and remains consistent whether the rack has square or round mounting holes. Our 4-hole rail design gives your gear 1/2RU vertical spacing for improved ventilation in your 19-inch rack. You'll get the precise, standardized dimensions of a 1U server rack unit — including height (1. 26 cm), mounting hole spacing, and critical clearance allowances — plus actionable guidance on verifying physical fit, avoiding common installation errors, and selecting.
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