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Black square 120mm server fan with 2-pin connector

OEM Industries

OEM Industries B31257-16A 12038 24V 0.28A 2 Pin Server Fan CPU cooler

SKU CH-059Y-NMWMS

120 mm ball-bearing server fan runs on 24 V at 0.28 A with a two-pin connector

  • Fan size120 mm
  • Bearing designBall
  • Power input connector2 Pin
  • Product colorBlack
  • Product typeFan only
  • 120 mm frame fits standard server bays
  • 38 mm thick housing moves more air
  • NIDEC ball bearing runs quietly for years
  • 24 V 0.28 A draw keeps power budget low
  • 2-pin connector plugs straight into server headers

Server-grade 24 V 120 mm fan

The OEM Industries B31257-16A is a 120 mm by 38 mm axial fan built by Nidec for 24 V server environments. It draws 0.28 A through a two-pin power connector and uses a ball-bearing motor for continuous operation. The black frame fits standard 12 cm mounting holes in rack enclosures and workstation chassis. No LED lighting is included.

Ball bearing and two-pin simplicity

Ball bearings tolerate higher ambient temperatures and longer duty cycles than sleeve alternatives, making the unit suited for 24/7 server workloads. The two-pin connector delivers power without PWM control, so speed stays constant once voltage is applied. Installers should verify that the target system provides a 24 V header or an appropriate adapter before mounting.

Replaces worn 24 V 12038 units

This fan directly substitutes failed or noisy 24 V 12038 models in OEM server trays and industrial enclosures. The upgrade is worthwhile when the original bearing has degraded or when a ball-bearing replacement is preferred for extended service life. It is not suited for 12 V desktop headers or PWM-controlled cooling curves.

How it compares

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

Price $23.99
Pricier than about 68% 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 nameB31257-16A
Product colorBlack
Product typeFan only
Power
Power input connector2 Pin
Size & build
Fan size120 mm
Bearing designBall
More details
LED lightingNo

Questions about this item

What does the 2-pin connector on the B31257-16A fan limit in practice?

The 2-pin connector supplies 24V power at 0.28A but does not carry a PWM or tachometer signal, so speed control and RPM monitoring are not available through the motherboard header.

What physical clearance does the 12038 frame need to fit?

The square 120 mm frame is 38 mm thick, so the mounting location must provide at least that depth plus space for the two-wire lead exit.

How is the fan installed and which wiring step is often missed?

Mount the fan with four screws through the corner holes, then connect the two-pin plug to a 24V header; the step often missed is verifying the header supplies 24V rather than 12V, because the fan will not start on 12V.

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