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Small square black 4cm case fan with two-pin cable

Fans

Fans 1608KL-04W-B50 B59 NMB 4020 12V 0.15A 4cm double ball case fan

SKU CH-ZFQA-PJ076

A 40 mm double-ball-bearing case fan delivering 40 CFM at 8500 rpm with 35 dBA noise on a 12 V two-pin connector

  • Double ball bearing extends service life in continuous operation
  • 8500 RPM ±10 % delivers 40 CFM for focused component cooling
  • 35 dBA noise level keeps acoustics low in noise-sensitive builds
  • 12 V 0.15 A draw suits standard motherboard 2-pin headers
  • 40×40×20 mm frame fits tight chassis and auxiliary cooling spots

40 mm Double-Ball Case Fan

This 40 mm NMB-MAT double-ball fan delivers 40 CFM at 8500 RPM with a 35 dBA noise rating. It operates on 12 V drawing 0.15 A and connects via a 2-pin motherboard header. The compact frame suits chassis south bridge, north bridge and auxiliary cooling in high-reliability server builds.

Simple 2-Pin Mounting

The 12 cm lead plugs straight into a motherboard 2-pin header with no adapters required. Double-ball bearings tolerate shaft misalignment better than sleeve types, but the small frame leaves little room for screw access in crowded bridges. Verify header polarity before powering the system to avoid reverse voltage.

Check Header And Clearance

Ensure the target board exposes a free 12 V 2-pin header within 12 cm of the mounting point. Confirm the 40 x 40 x 20 mm footprint clears adjacent heatsinks, voltage regulators or tall memory modules. This fan is not suited for builds that need PWM speed control or larger-diameter airflow paths.

How it compares

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

Price $29.99
Pricier than about 74% 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

How can I confirm the fan is running at the rated 8500 RPM after installation?

Use BIOS hardware monitor or a fan-control utility to read the 2-pin header speed; it should show approximately 8500 RPM with a ±10 % tolerance.

What comes in the box and what must I provide separately?

The package includes the 40 mm double-ball-bearing fan with a 12 cm two-pin lead; you must supply a motherboard 2-pin header or a compatible fan controller.

Which version should I choose for a 12 V server chassis needing 40 CFM airflow?

Select the 1608KL-04W-B50 B59 model rated at 12 V, 0.15 A, 8500 RPM and 40 CFM for that application.

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