Lenovo 7XH7A06781 Thinksystem ST550 Front MID FAN Module for 4X2.5INCH ODD Conversion

Lenovo 7XH7A06781 ThinkSystem ST550 Front Mid Fan Module

Overview

The Lenovo 7XH7A06781 is a front mid fan module designed specifically for ThinkSystem ST550 servers configured with the 4x2.5-inch optical disk drive (ODD) bay conversion. When the ST550 is reconfigured from its standard bay layout to a 4x2.5-inch ODD setup, the front airflow path changes — this module slots into the resulting mid-chassis gap to maintain directed cooling across the drive bays and ensure thermal compliance. Without it, the converted chassis lacks the targeted airflow required to keep front-bay components within operating spec.

Compatibility

Designed for the Lenovo ThinkSystem ST550 tower server (7X09, 7X10 series) when performing a 4x2.5-inch ODD bay conversion. This module is specific to that conversion path — it is not a universal ST550 fan component and does not fit standard non-converted ST550 configurations or other ThinkSystem tower models such as the ST250 or ST650. Verify your ST550 is configured for the 4x2.5-inch ODD layout before ordering. For broader server components compatible with ThinkSystem platforms, confirm the exact chassis generation and bay configuration against Lenovo's compatibility matrix.

Installation Notes

The module measures 7.50 x 11.00 x 4.90 in and weighs 1.65 lb — plan for the physical clearance required during installation with the ST550 chassis open. This is a tool-assisted internal component swap; the ST550 chassis must be powered down and access panels removed before the module can be seated. No torque or wiring specifications are documented in available evidence — follow the ST550 Hardware Maintenance Guide for bay conversion sequencing to avoid damaging adjacent cable runs or drive backplanes during installation.