Application

Sheet Metal Fabrication for Data Centers

A data centre is a room full of equipment that all has to fit, breathe and be earthed. The sheet metal is the part that makes those three possible, and it is usually where a design first goes wrong.

Reviewed by Tom, Senior Process Engineer·Dongguan source factory · 11+ years in precision sheet metal

ai data center pdu server — sheet metal fabrication for data centers

Short answer

Data centre sheet metal has to satisfy three things at once: it fits a standardised rack interface, it passes enough air to keep the equipment in range, and it is bonded to earth. Those three constraints decide the material, the perforation and the masking.

What the parts are

Racks and subracks, PDU housings, cable management arms and trays, blanking panels, airflow shrouds, and mounting brackets for power and networking equipment. Individually they are simple folded parts; together they have to interoperate to millimetre tolerances because they all reference the same rack.

Part	Governing constraint	Consequence for the drawing
Rack and subrack	19-inch interface, EIA-310 rail spacing	Fixed datum; everything else dimensions from it
PDU housing	Busbar clearance, purchased component envelope	Internal height is dictated, not chosen
Blanking panel	Airflow sealing, tool-free fitting	Light gauge, formed edges, latch detail
Cable tray / arm	Bend radius of the cable, load of the bundle	Depth and radius set by cable, not by stiffness
Cooling shroud	Open area percentage, ducted path	Perforation pattern agreed with thermal engineer

Where the constraints come from

Thermal and structural requirements pull against each other

Every opening that lets air through also removes stiffness. A 1U tray with a large perforated area twists when it is bolted into a rack, and the front panel then does not sit square. The answer is almost never more thickness — it is a formed rib behind the perforation, extended side returns, or a separate stiffener riveted in, all of which add stiffness without reducing the open area.

Perforation percentage belongs on the drawing, agreed with whoever owns the thermal model. Guessing it and then changing it later means either a new programme or a part that runs hot.

Bonding, masking and the finish

Equipment in a rack has to be bonded to earth, and a powder-coated panel is an insulator. Any surface the bonding path runs through — rail contact lands, studs, flange overlaps, the inside of a bolted joint — has to be masked before coating. It is a two-line note on the drawing and an assembly failure if it is missed.

Where a part must be conductive and also protected, the alternatives are zinc-coated steel left bare, a masked contact area, or plated hardware used for the joint rather than the painted panel. All three are cheaper than stripping a coated part.

State the rack standard and rail spacing you are building to, not the one you assume.
Give the perforation open-area figure and say who owns it.
Nominate every masking area, including the inside of bolted joints.
Check the part fits through the rack aperture and past its neighbours — model the installation, not just the part.

Frequently asked questions

Can you build to a specific rack standard?

Yes, and we would rather build to your stated interface than to an assumed one. Send the rail spacing and mounting hole pattern; variations exist between standards and a chassis built to a different hole pitch is scrap.

How do you keep a 1U tray stiff with a large vent area?

With geometry rather than thickness: a formed rib pressed across the tray behind the front panel, and extended side returns that carry load from the rail to the back. Both are forming operations in the same programme and neither reduces the open area.

Will a powder-coated panel still earth properly?

Only where the contact surfaces were masked before coating. Powder is an insulator, so the earth path has to run through bare metal — a stud, a flange land or a plated fixing. We keep a masked-area list on the drawing and test continuity on assembled units.

Do you supply racks assembled?

We supply chassis, subracks and cable management built and, where specified, assembled with inserts, rails and hardware fitted. Rack-level integration and equipment installation stay with your integration team, which is normally where you want them.

What about weight?

Rack equipment has a weight budget and it is finite. Aluminium saves mass but needs a conductive finish and is less stiff per unit thickness, so a slightly thicker aluminium part can be lighter and stiffer than the steel one it replaces — worth checking rather than assuming.

Cluster hubData centre & AIRacks, PDUs and the thermal constraints that shape them.

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