3U Server Chassis – Mid-Size Rackmount Enclosures | Server Warehouse

3U chassis occupy a practical middle ground: more internal volume than a 2U for drive-heavy or airflow-sensitive builds, without the full height of a 4U. The K339F is our current in-stock 3U model — 390mm deep, supporting ATX and Micro-ATX motherboards with eight 3.5-inch drive bays, making it one of the higher drive-density options in the range relative to rack height. It suits NAS builds, backup servers and surveillance storage builds where you want maximum drives in minimum rack space.

The CSF015 (EATX support) is currently out of stock. If you require a 3U EATX chassis, contact us to check lead time or consider the K480FB 4U EATX as an alternative with additional headroom.

3U chassis accept standard ATX power supplies. Rail kits are not included — the NJ-2020-18 covers shallow rack installations and the NJ-2020-22 22-inch kit suits standard-depth racks.