Lenovo 4XH7A61116 ST550 2.5-Inch 8-Bay X40 Cable Kit
Overview
The Lenovo 4XH7A61116 is a factory-matched cable kit designed to wire up the 2.5-inch 8-bay X40 storage backplane in the ThinkSystem ST550 tower server. If you're expanding storage capacity in an ST550 and need the internal SAS/SATA signaling cables to connect that backplane to the RAID or HBA controller, this is the part that closes the loop. At 0.45 lb and 9.50 x 6.00 x 2.20 in, the kit is sized to route cleanly within the ST550 chassis without crowding adjacent components or blocking airflow paths.
Compatibility
Designed specifically for the Lenovo ThinkSystem ST550 tower server platform. This kit supports the 2.5-inch 8-bay X40 backplane configuration — confirm your ST550's backplane bay count and drive size before ordering, as Lenovo offers multiple backplane variants for this chassis. It is not a universal Lenovo server cable kit and should not be assumed compatible with other ThinkSystem models (SR550, ST558, etc.) without verification against Lenovo's ST550 configuration matrix.
Installation Notes
Route cables before seating drives — access to the backplane connector is restricted once drive sleds are installed. Verify controller port assignment against the ST550 service manual to ensure correct cable-to-port mapping; mislabeled connections on X40 backplanes can result in drive enumeration errors that are difficult to diagnose post-assembly. No special tooling is specified beyond standard server servicing practice.
