OEM Industries DS04020B12S 40x20mm 12V .4A 3-pin CPU cooler

40 mm 12 V DC fan for compact CPU cooling

The OEM Industries DS04020B12S is a square 40 mm by 20 mm axial fan that runs on 12 V at 0.4 A through a standard 3-pin connector. It uses a hybrid bearing with one ball and one sleeve element and has no LED lighting. The unit is supplied as a fan only, without a heatsink or mounting hardware, and is intended for tight spaces where a low-profile cooler is required.

Suitable for small-form-factor repairs

Builders working on 1U servers, thin clients or industrial boards with a 4020 mounting pattern can use this fan as a direct replacement. It is not suited for standard desktop sockets that expect a larger heatsink assembly, nor for systems that require PWM speed control via a 4-pin header. Buyers needing higher airflow or a complete cooler with fins should consider other solutions.

Steady airflow within a fixed 12 V supply

Because the fan operates at a constant 12 V and 0.4 A, its rotational speed and noise level remain stable during prolonged operation rather than ramping up and down. The mixed bearing design is intended to maintain consistent performance over long running periods in enclosed chassis. Thermal behaviour will depend on the heatsink it is paired with and the case ventilation available.