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Black 120mm square frame fan, two wires, no LED

OEM Industries

OEM Industries B31256-56 120mm Fan 12V 0.49A 2-Wire Ball Bearing

SKU CH-BN3C-ENC6F

120 mm ball-bearing fan delivers 80 cfm airflow at 3000–3499 rpm with 40–45 dBA noise

  • ColorBlack
  • TypeFan only
  • Fan Size120mm
  • Bearing TypeBall
  • Power Connector2 Wires
  • LEDNo
  • High airflow over 80 CFM from 3000-3499 RPM
  • Quiet operation at 40-45 dBA noise level
  • Durable ball bearing design for long life
  • Simple 2-wire 12V 0.49A power connection
  • Compact 120mm frame fits standard mounts

Targeted Cooling Upgrade

The OEM Industries B31256-56 is a 120mm fan only unit built for direct 12V 0.49A two-wire connection. Ball bearing construction supports continuous duty in mining rigs or standard PC cases where a simple, high-speed airflow device is required.

Replaces Weaker Case Fans

This unit suits builders replacing stock 120mm fans that spin below 3000 rpm or deliver under 80 cfm. The jump is worth it when chassis pressure demands sustained airflow above 80 cfm and the 40 to 45 dBA acoustic ceiling is acceptable for the environment.

Sustained High-Speed Operation

Ball bearing design maintains 3000 to 3499 rpm output without the wear patterns seen in sleeve alternatives under constant load. Airflow remains above 80 cfm during extended mining or rendering sessions while noise holds within the 40 to 45 dBA band.

Highlights

  • High airflow over 80 CFM from 3000-3499 RPM
  • Quiet operation at 40-45 dBA noise level
  • Durable ball bearing design for long life
  • Simple 2-wire 12V 0.49A power connection
  • Compact 120mm frame fits standard mounts

Specifications

ModelB31256-56
ColorBlack
TypeFan only
Fan Size120mm
Bearing TypeBall
Power Connector2 Wires
LEDNo

Questions about this item

Does the 120mm frame use the standard PC case mounting holes?

The fan has a 120mm square frame; verify your case or radiator uses the matching 120mm hole pattern before mounting.

How do I connect the two bare wires to a motherboard header?

Identify the 12V and ground wires, then crimp or solder them to a 3-pin or 4-pin plug that matches your header; the fan draws 0.49A at 12V.

When will the ball bearing need replacement?

Ball bearings typically run for tens of thousands of hours; replace the fan if noise rises above the rated 40 to 45dBA or speed drops below 3000rpm.

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