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Small black 40mm square case fan with oil bearing

SXDOOL

SXDOOL rmd4028s 40mm 12V 7000rpm case fan

SKU CH-TWR4-6G0Y3 MPN rmd4028s

40 mm 12 V case fan spins at 7000 rpm with oil bearing for 1U server cooling

  • High-speed 7000rpm airflow for tight 1U server builds
  • Quiet 28dBA operation keeps rack noise low
  • 12V 0.18A draw minimises power-supply load
  • Oil-bearing design extends service life in continuous use
  • Compact 40x40x28mm frame fits dense chassis layouts

SXDOOL 40 mm 12 V case fan

The SXDOOL rmd4028s is a 40 mm square fan designed for 1U industrial servers and compact chassis. It runs on 12 V power and spins at 7000 rpm to move air through tight spaces where larger fans cannot fit.

Practical limits of 12 V 4028 form factor

At 40×40×28 mm the fan suits only mounts built for the 4028 standard. The 0.18 A draw and 2.16 W consumption keep load light on a 12 V rail, while 28 dBA noise output is audible in quiet rooms but low for this speed class.

Oil-bearing build with two-wire lead

An oil bearing keeps friction low without the cost of a ball or fluid-dynamic unit. The two-wire lead delivers power only, so speed is fixed at 7000 rpm unless an external controller regulates voltage. Mounting holes match the 4028 pattern used in 1U power supplies and small-form-factor enclosures.

How it compares

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

Price $8.99
Cheaper than about 92% of the 8,339 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What does the 7000rpm figure mean for airflow in a 1U server?

At 7000rpm the 40mm fan moves a high volume of air through the tight 1U chassis, keeping components cool under sustained load.

How loud is 28dba in a rack cabinet?

28dba is a low hum that blends into typical rack background noise; it will not dominate a server room.

What connector does the 2-line lead use?

The fan ships with a two-wire lead that plugs into a standard 12V header on the power supply or motherboard.

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