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All-black 120mm square frame case fan with curved blades and four-pin connector

Cooler Master

Cooler Master MFX-B2NN-18NPK-R1 SickleFlow 120 V2 120mm case fan

SKU CH-99S8-730ZZ MPN MFX-B2NN-18NPK-R1

A 120 mm case fan delivering up to 62 CFM airflow at 650–1800 RPM with 8–27 dBA noise and a sealed rifle bearing

  • Fan Counts1 Fan
  • Fan ControllerNo Controller
  • TypeCase Fan
  • CompatibilityCase
  • Fan Size120mm
  • Fan Thickness25mm
  • All-black design suits stealth builds
  • Revised curve blades raise airflow to 62 CFM max
  • Enhanced frame cuts turbulent noise down to 8 dBA minimum
  • Sealed rifle bearing blocks dust and oil leakage
  • PWM control spans 650 to 1800 RPM for precise cooling

120mm PWM Case Fan

The Cooler Master SickleFlow 120 V2 is a 120mm case fan with a 4-pin PWM connector for automatic speed control. It uses a Rifle Bearing and runs between 650 and 1800 RPM to deliver up to 62 CFM of airflow. The all-black square frame and blades suit builders who want a stealthy appearance without LED lighting.

Motherboard Header and Mounting Check

Verify that your motherboard has a free 4-pin PWM header so the fan can report speed and respond to temperature curves. The unit measures 120 x 120 x 25 mm, so confirm your case or radiator has 120mm mounting holes with 25mm clearance. Four mounting screws are included in the package.

Quiet Builds and Radiator Use

This fan suits quiet-focused PCs and liquid-cooling radiators where low noise at idle and strong static pressure under load matter. The 8 to 27 dBA range keeps it subtle at low speeds. Buyers who need addressable RGB lighting or a bundled fan controller should look at other models.

Highlights

  • All-black design suits stealth builds
  • Revised curve blades raise airflow to 62 CFM max
  • Enhanced frame cuts turbulent noise down to 8 dBA minimum
  • Sealed rifle bearing blocks dust and oil leakage
  • PWM control spans 650 to 1800 RPM for precise cooling

Specifications

BrandCOOLER MASTER
SeriesSickleFlow 120 V2
ModelMFX-B2NN-18NPK-R1
Fan Counts1 Fan
Fan ControllerNo Controller
TypeCase Fan
CompatibilityCase
Fan Size120mm
Fan Thickness25mm
Bearing TypeRifle Bearing
RPM650 - 1800 RPM +/- 10%
Air Flow62 CFM ( Max )
Noise Level8 - 27 dBA
Power Connector4 Pin
ColorBlack
FeaturesNo Colors Needed: Signature cooling performance with an all-black design: a perfect choice for all of the users who want a simple, sleek, and stealthy look.
New Blade Design: Revised curve blade design to improve airflow and air pressure.
Enhanced Fan Frame: Enhanced frame structure, reducing turbulent flow noise increase efficiency.
Sealed Bearing Structure: Sealed and secured fan bearing, preventing dust and lubricating oil leakage while increasing the fan’s operation stability and life span.
Dimensions120 x 120 x 25 mm
Package ContentsSickleFlow 120
4 x Screws
Shipping weight0.23 kg
Package size196 × 140 × 33 mm

Questions about this item

What comes in the box with the SickleFlow 120 V2 and do I need to buy mounting hardware separately?

The package includes the fan and four screws, so no extra mounting hardware is required for a standard case or radiator installation.

Should I choose this 120 mm model or a different size for my build?

This model is a 120 mm fan with a 25 mm thickness; select it when your case or radiator has 120 mm mounting points.

How loud is the fan at its maximum 1800 RPM in a real system?

At 1800 RPM the noise level reaches 27 dBA, while at the minimum 650 RPM it drops to 8 dBA, giving a wide usable range.

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