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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

  • Fan size120 mm
  • Bearing designBall
  • Power input connector2 Wires
  • Product colorBlack
  • Product typeFan only
  • 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.

How it compares

Measured against everything we stock in CPU Coolers & Heatsink Fans, at today’s prices. Recalculated every night.

Price $21.99
Pricier than about 60% of the 1,559 comparable items (median $19.99).
Fan size 120 mm
Higher than about 80% of the 812 comparable items (median 80 mm).

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Specifications

Product
Model nameB31256-56
Product colorBlack
Product typeFan only
Power
Power input connector2 Wires
Size & build
Fan size120 mm
Bearing designBall
More details
LED lightingNo

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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