Lenovo SR250/SR150 4X3.5 SS HBA BP Bracket V2 - 4Z57A80507

Lenovo 4Z57A80507 SR250/SR150 4x3.5" SAS HBA Backplane Bracket V2

Overview

The Lenovo 4Z57A80507 is a second-revision backplane bracket designed specifically for 4x3.5-inch SAS HBA drive configurations in the ThinkSystem SR250 and SR150 server platforms. If you're building out a storage-direct HBA topology — bypassing the RAID controller to hand raw drive access to software-defined storage or backup applications — this bracket is the mechanical piece that positions and secures the backplane within the chassis correctly. Without the right bracket revision, drive bay alignment and backplane seating are compromised. At 2.0 lb, this is a solid, chassis-matched component, not a generic aftermarket bracket.

Compatibility

The 4Z57A80507 is validated for use in the following Lenovo ThinkSystem platforms configured with a 4x3.5-inch large-form-factor drive bay and SAS HBA (non-RAID, pass-through) backplane:

• ThinkSystem SR250 — 1U rack server, 4x3.5" LFF HBA storage option
• ThinkSystem SR150 — 1U rack server, 4x3.5" LFF HBA storage option

This bracket is specific to the HBA (host bus adapter) backplane variant — do not substitute for RAID backplane configurations, which use a different bracket assembly. The V2 designation indicates a revised fit; verify your server's build date and existing bracket part number before ordering if retrofitting an older SR250 or SR150 chassis.

Installation Notes

Installation is chassis-internal and requires partial disassembly of the SR250 or SR150 drive cage. Confirm the server is fully powered down and grounded before removal of any internal components. Match the backplane connector orientation to the HBA cabling path before seating the bracket — misalignment at this stage can stress the backplane PCB. No special tooling is documented in available evidence beyond standard server service procedures.