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Black 240mm slim copper radiator with fin array and end tanks

Alphacool

Alphacool NexXxoS ST25 Full Copper 240mm Radiator

SKU CH-A19J-BTNY9

A 240 mm full-copper slim radiator with 15 FPI fin density for compact liquid-cooling loops

  • ColorBlack
  • FeaturesThe ST25 slim radiators offer the ideal liquid cooling solut

Size 240mm

  • Full copper construction maximises thermal transfer with 400 W/(mK) conductivity
  • 15 FPI fin density balances airflow and cooling without high fan pressure
  • Slim 25 mm profile fits Mini-PC and small form factor builds
  • Includes three screw lengths and Allen key for flexible mounting options
  • End chambers, water channels and fins all pure copper — unique worldwide

Slim Copper Radiator

The Alphacool NexXxoS ST25 is a 240mm full-copper radiator built for Mini-PC and Small Form Factor liquid-cooling loops. Its end chambers, water channels and cooling fins are all pure copper, a combination the supplier says no other maker uses. The 25mm slim profile fits tight chassis where thicker radiators cannot. It targets builders who want maximum thermal conductivity in a compact footprint.

Straightforward Mounting

The box includes three screw lengths: M3x30mm, M3x5mm and M3x35mm plus an Allen key, so you can match fan thickness and case material without hunting hardware. Copper is heavier than aluminium, so verify your mounting points can carry the extra mass. The 15 FPI fin density keeps airflow resistance low, meaning standard case fans work well without high static pressure. Follow the supplied instructions to avoid cross-threading the brass threads.

SFF Loop Builders

This radiator suits enthusiasts assembling custom loops in space-constrained cases who value copper’s 400 W/(mK) conductivity over aluminium’s 236 W/(mK). It is not for buyers who need a thicker core for higher total dissipation, nor for open-loop kits that expect aluminium components and proprietary fittings. Builders without room for a 240mm fan pair should look at smaller radiator formats.

Highlights

  • Full copper construction maximises thermal transfer with 400 W/(mK) conductivity
  • 15 FPI fin density balances airflow and cooling without high fan pressure
  • Slim 25 mm profile fits Mini-PC and small form factor builds
  • Includes three screw lengths and Allen key for flexible mounting options
  • End chambers, water channels and fins all pure copper — unique worldwide

Specifications

BrandAlphacool
Model1019152
Part Number1019152
ColorBlack
FeaturesThe ST25 slim radiators offer the ideal liquid cooling solution for Mini-PCs or SSF (Small Form Factor) systems.

Other versions of this model

1 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How can I verify the radiator is circulating coolant correctly after installation?

Check that coolant flows through the pure copper water channels without leaks and that the 15 FPI fin spacing allows steady airflow across the fins.

What mounting hardware is included and do I need to buy fans separately?

The box contains the 240 mm radiator, 8x M3x30 mm screws, 8x M3x5 mm screws, 8x M3x35 mm screws and an Allen key; fans are not included.

Which version of the NexXxoS ST25 should I choose for a Mini-PC build?

The 240 mm slim model with 25 mm thickness and full copper construction is designed for Mini-PCs and Small Form Factor systems.

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