Table of Contents
Server Tray Die Casting: Why Aluminum Wins for Data Center Racks
Server tray die casting is becoming one of the more overlooked disciplines in rack-mount manufacturing as AI infrastructure scales. It’s not a headline part the way GPUs or liquid cooling loops are, but it’s the structural backbone that everything else in the rack mounts to and, increasingly, the surface that heat gets distributed across before it leaves the system. As rack power density climbs, the design demands on server trays are climbing with it.
A More Complex Part Than It Looks
A modern server tray isn’t a flat stamped panel anymore. It typically needs to integrate mounting bosses for drives and boards, structural ribbing for rigidity under load, guide features for cable routing, and increasingly, surface geometry that supports heat distribution across the tray itself. Combining all of that into one part, built with sheet metal, usually means multiple stamped pieces welded or fastened together — more parts, more tolerance stack-up, more places for a joint to loosen or fail over the service life of the equipment.
Where Server Tray Die Casting Changes the Equation
Aluminum high-pressure die casting forms all of that complexity — bosses, ribs, guide channels, mounting patterns — into a single structural shot, straight out of the tool. For a part like a server tray, that translates into fewer secondary operations, tighter dimensional repeatability from unit to unit, and a more economical cost curve once a program moves from prototype quantities into the production volumes AI server deployment now requires, as demand from the US data center boom radiates through supply chains. It also means one part instead of an assembly — fewer places for something to work loose inside a rack that’s expected to run continuously for years.
The Tonnage Question
Server trays for rack-scale hardware are large, thick-walled structural parts. Producing them properly — filling the mold fully, holding structural integrity across a big casting — requires higher-tonnage die casting equipment, not standard mid-size machines. EKO Metal Industries currently operates die casting machines up to 800T, including a dedicated 500T unit, sized specifically for this class of large-format aluminum structural components, supported by vacuum-assisted casting to help manage porosity in thicker-walled sections.
Built on an Existing Capability Base
Server tray programs are new to many suppliers’ portfolios, but the underlying manufacturing problem isn’t new to EKO. Our existing casting work includes large structural base frames with integrated ribbing and multi-point mounting patterns, and finned aluminum housings for telecommunications and industrial equipment. The tooling discipline, higher-tonnage casting capability, and dimensional consistency behind those parts are the same capabilities a server tray program calls for.
Not Everything on the Rack Needs 500 Tons
It’s worth noting that a server rack isn’t uniform in what it demands from a supplier. Alongside large aluminum trays, the same BOM often calls for small precision components — connector housings, latch mechanisms, bracket hardware — parts suited to a completely different process: zinc multi-slide die casting. EKO also operates zinc multi-slide machines (5T and 20T) for exactly this class of compact, multi-directional geometry. A single data center program can reasonably draw on both ends of that spectrum within the same sourcing conversation. For cooling-specific components like CDU housings and heat sink bases, see our earlier piece on die casting for data center cooling.
Qualification Takes Time — Plan Accordingly
Server tray die casting programs typically move through prototype tooling, dimensional validation, and pilot-run sign-off before full production release. Building that timeline into a sourcing decision early — rather than treating tooling lead time as a late-stage surprise — tends to make the difference between a program that scales smoothly and one that stalls at qualification.
Let’s Talk
If your team is developing or sourcing server tray structures — or other large-format aluminum die-cast components for rack-mount and thermal distribution applications — we’d welcome a conversation about your specifications and volumes.
