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

SunnyStar Co., Ltd

SunnyStar Co., Ltd KF0420B5L--R 40*20mm 5V .6W 2Pin case fan

SKU CH-S4W2-64WMM

A 40 mm square case fan with ball bearing runs on 5 V and draws .6 W through a 2-pin connector

  • Bearing designBall
  • Power input connector2 Pin
  • LED lightingNon-LED
  • Product typeCase Fan
  • Product colorBlack
  • Key featuresDC square Cooler
  • Compact 40×20 mm footprint fits tight enclosures
  • Ball bearing ensures long service life
  • 5 V 0.6 W draw keeps power use low
  • Two-pin connector simplifies wiring
  • Non-LED black frame suits discrete builds

Compact 40 mm ball-bearing fan

The SunnyStar KF0420B5L--R is a 40 by 20 mm DC square cooler built for tight enclosures such as network switches and routers. It runs on a 5 V supply and draws .6 W through a simple two-pin connector. The black frame and non-LED design keep the unit visually unobtrusive in professional racks or embedded builds.

Ball bearing and two-wire power

A ball bearing spindle provides consistent rotation and longer service life compared with sleeve alternatives in continuous-operation scenarios. The two-wire lead delivers power without PWM control, so speed stays constant once voltage is applied. At 40 mm square the fan fits standard 4 cm mounting holes, making retrofits straightforward in legacy appliances.

Direct drop-in for 4 cm bays

This model replaces older 40 mm case fans that use the same two-pin 5 V interface and 40 by 20 mm footprint. The upgrade is worthwhile when the original unit has developed bearing noise or airflow loss after extended duty cycles. Buyers who need variable speed control or larger frame sizes should look elsewhere.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $20.99
Typical for this category: the median of 8,339 items is $19.99.

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Specifications

Product
Product lineKF0420B5L--R
Model nameKF0420B5L
Product typeCase Fan
Product colorBlack
Power
Power input connector2 Pin
Size & build
Bearing designBall
Product dimensions40 × 40 × 20 mm
More details
LED lightingNon-LED

Questions about this item

What does the 2-pin 5 V connector limit for speed control?

The 2-pin 5 V connector provides constant voltage, so the fan runs at a fixed speed with no PWM or voltage regulation.

What clearance does the 40×40×20 mm frame need?

It requires a 40 mm square mounting hole pattern and 20 mm depth behind the panel for the motor body.

How do you orient the two wires when installing?

Connect the red wire to 5 V and the black wire to ground; reversing them will prevent the fan from spinning.

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