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Rectangular copper radiator with parallel fin channels and brass end tanks, 120mm fan mount spacing

Alphacool

Alphacool NexXxoS ST30 X-Flow 120mm Full Copper Radiator 14228

SKU CH-5MHX-4TARQ

Full copper 30 mm thick 120 mm radiator with X-Flow internal design for high flow rates

  • TypeRadiator

Size 120mm

  • Full copper construction including chambers boosts heat transfer
  • 30 mm slim profile fits tight chassis spaces
  • X-Flow design enables high coolant flow rates
  • 120 mm fan compatibility suits standard mounting points
  • Includes mounting hardware and two screw plugs for immediate install

Alphacool NexXxoS ST30 120mm Radiator

The Alphacool NexXxoS ST30 is a full-copper water-cooling radiator built for custom-loop builders who want maximum thermal conductivity from every component. Its chambers, channels and fins are all copper, removing the brass or aluminium bottlenecks found in conventional designs. The X-Flow internal structure is engineered for high flow rates, making it suitable for loops with multiple blocks or restrictive components. This 120mm unit fits single-fan mounting points in compact or full-size cases.

Full copper construction and X-Flow layout

Every primary part of the heat exchanger uses copper, so coolant contacts a uniform metal surface from inlet to outlet. The bevelled chamber design reduces turbulence and pressure drop, letting pumps maintain velocity through dense fin stacks. Two screw plugs and a full mounting hardware kit are included, so the radiator can be pressure-tested and secured without extra purchases. Standard G1/4 threads accept any common fitting angle or diameter.

Verify loop compatibility before ordering

Confirm that your case offers a 120mm mounting location with enough clearance for fan thickness and fitting protrusion. Ensure your pump can deliver the flow rate the X-Flow design expects, especially if the loop already contains CPU and GPU blocks. Check that your tubing and fittings match G1/4 threads and that you have space to route lines to the radiator ports without sharp bends. The package contains only the radiator, plugs and screws; fans and coolant are separate.

Highlights

  • Full copper construction including chambers boosts heat transfer
  • 30 mm slim profile fits tight chassis spaces
  • X-Flow design enables high coolant flow rates
  • 120 mm fan compatibility suits standard mounting points
  • Includes mounting hardware and two screw plugs for immediate install

Specifications

TypeRadiator

Other versions of this model

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Questions about this item

How does the X-Flow design affect flow resistance in a custom loop?

The X-Flow internal structure is built for high flow rates, reducing restriction so coolant moves through the radiator with less pump pressure required.

What hardware is included to mount the 120 mm radiator in a case?

The box contains the radiator, two screw plugs, and the mounting hardware needed to secure it to standard 120 mm fan locations.

What is the correct way to install the two screw plugs before pressure testing?

Thread both plugs into the unused ports by hand, then snug them with a wrench — over-tightening strips the copper threads and causes leaks.

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