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Small square black case fan, 40 by 40 by 20 mm, two-wire connector

Zyvpee

Zyvpee KD1204PKBX-A 4020 2-Pin Ball Bearing Case Fan 40x40x20mm Black

SKU CH-C5JZ-79VEW

Compact 40×40×20 mm ball-bearing fan runs on 5 V and 0.4 W for CPU or router cooling

  • Bearing designBall
  • Power input connector2 Pin
  • LED lightingNon-LED
  • Product typeCase Fan
  • Compatible withCPU Cooler
  • Product colorBlack
  • Ball-bearing design extends service life
  • 5 V, 0.4 W power draw keeps energy use low
  • 40×40×20 mm frame fits tight 4020 mount points
  • Two-pin DC connector simplifies wiring
  • Non-LED black finish suits discreet builds

Compact 40 mm Cooling Fan

The Zyvpee KD1204PKBX-A is a 40x40x20 mm case fan designed for tight spaces such as small-form-factor CPU coolers or network equipment. It runs on a 5 V supply and draws 0.4 W through a two-pin connector. The black frame and non-LED design keep the appearance neutral. Ball-bearing construction supports continuous operation in always-on devices.

Upgrade From Sleeve-Bearing 4020 Fans

This unit replaces older 4020 fans that use sleeve bearings and develop noise or seizure over time. The jump is worth it when the existing fan rattles, slows under load or fails to spin up reliably at 5 V. Builders maintaining legacy router boards or compact heatsinks gain longer service intervals without changing mounting holes or voltage rails.

Limits Of The Two-Pin 5 V Interface

Speed is fixed by the supplied voltage because the two-pin connector carries no PWM or tachometer signal. The motherboard or controller cannot modulate RPM or monitor rotation, so thermal curves must be managed by varying the 5 V rail itself. Systems that require automatic fan curves or stall detection need a three- or four-pin header instead.

How it compares

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Price $19.99
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Specifications

Product
Product lineKD1204PKBX-A
Model nameKD1204PKBX-A
Product typeCase Fan
Product colorBlack
Power
Power input connector2 Pin
Size & build
Bearing designBall
Product dimensions40 × 40 × 20 mm
Compatibility
Compatible withCPU Cooler
More details
LED lightingNon-LED

Questions about this item

Will the 40x40x20mm frame fit my CPU cooler mounting holes?

The fan measures 40mm by 40mm with a 20mm thickness, matching the standard 4020 footprint used on many compact CPU coolers.

How do I connect the 2-pin power cable correctly?

Align the two wires with the motherboard or controller header; the connector is keyed so it only seats one way — forcing it backwards bends the pins.

When should I expect to replace the ball-bearing fan?

Ball bearings typically run for tens of thousands of hours; listen for new rattling or a drop in airflow as the signal to swap it out.

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