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Rails installed quickly and aligned perfectly.
789388-B21
1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI
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789388-B21
1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI
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789388-B21 is an enclosed rack designed for secure, high-density equipment installations. With a towering 42U height and a standard 19-inch mounting width, this rack offers ample space for network devices, servers, and telecom equipment, ensuring a robust weight capacity of 501–1000 lbs and a vented door design that promotes efficient airflow and cooling.
Engineered for data centers, network closets, telecom racks, and AV equipment, the 789388-B21 rack features integrated cable management for neat organization, optional casters paired with included leveling feet for stable floor-standing installation, and a front door locking mechanism for enhanced security. Its design meets industry mounting standards and is constructed from durable steel to withstand demanding operational environments.
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In large enterprise data centers migrating to HPE ProLiant Gen9 servers, IT infrastructure teams deploy the 789388-B21-1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI to retrofit standard 19-inch racks. This tool-less, sliding-rail solution cuts installation time by up to 50%, minimizes service interruptions, and ensures precise server alignment—delivering rapid, reliable rack upgrades and maximizing operational uptime.
A retail chain’s IT manager uses the 789388-B21-1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI to standardize HPE ProLiant Gen9 deployments across 200+ remote stores. The modular, tool-free rail design enables field technicians to install 1U LFF servers in under 10 minutes per site, reducing labor costs by 30%, enforcing consistent hardware configurations, and accelerating store-wide application rollouts for improved customer experience.
Colocation facility engineers leverage the 789388-B21-1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI for quick hot-swap and routine servicing of densely packed 1U Gen9 servers. The easy-install rails allow rapid slide-out access without rack removal, reducing mean time to repair (MTTR) by 40% and ensuring maximum availability for mission-critical workloads in shared hosting and edge computing environments.
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 789388-B21 |  H6J84A |  H6J78A |  A7511A |  775167R-B21 | |
|---|---|---|---|---|---|
| Product Type | Rack | Rack | Rack | Rack | Rack |
| Rack Type | Enclosed Cabinet | Enclosed Cabinet | Enclosed Cabinet | Enclosed Cabinet | Enclosed Cabinet |
| Mounting Type | Floor Standing | Floor Standing | Floor Standing | Floor Standing | Floor Standing |
| Rack Height (U) | 42U | 42U | 42U | 42U | 42U |
| Use Case | Data Center / Networking Closet / AV Rack / Telecom | Data Center | Data Center / Networking Closet / AV Rack / Telecom | Data Center / Networking Closet / Telecom / AV Rack | Data Center / Networking Closet / Telecom / AV Rack |
| Rack Width | 19-inch | 19-inch | 19-inch | 19-inch | 19-inch |
| Rack Depth | 800–1000mm | 800–1000mm | 1000mm+ | 600–800mm | 600–800mm |
| Weight Capacity | 501–1000 lbs | 501–1000 lbs | 501–1000 lbs | 501–1000 lbs | 2000+ lbs |
| Material | Steel | Cold-Rolled Steel | Cold-Rolled Steel | Steel | Cold-Rolled Steel |
| Door Type | Vented Door | Vented Door | Vented Door | Vented Door | Vented Door |
| Side Panels | Fixed | Tool-less | Removable | Fixed | Removable |
| Cable Management | Included | Included | Included | Included | Tool-less |
| Cooling Support | Passive Ventilation | Passive Ventilation | Passive Ventilation | Passive Ventilation | Passive Ventilation |
| Locking Mechanism | Front Door Lock | Front Door Lock | Front Door Lock | Front Door Lock | Front Door Lock |
| Casters | Optional | No | Optional | Optional | No |
| Leveling Feet | Included | Included | Included | Included | Included |
| Rails Included | Yes | Yes | Yes | Yes | Yes |
| Expansion Ready | Yes | Yes | Yes | Yes | Yes |
| Grounding Kit Included | Yes | Yes | Yes | Yes | Yes |
| Color | Black | Black | Black | Black | Black |
| Compliance | RoHS | EIA-310-D | EIA-310-D | EIA-310-D | UL Listed |
| Product Name | 789388-B21 Enclosed Server Rack Cabinet | H6J84A Enclosed Server Rack | H6J78A Enclosed Server Rack | A7511A Enclosed Data Center Rack | 775167R-B21 Enclosed Cabinet Rack |
| Height | 73.5 inches | 78 inches | 84 inches | 73.5 inches | 73.5 inches |
| Width | 24 inches | 24 inches | 24 inches | 23 inches | 24 inches |
| Depth | 36 inches | 36 inches | 30 inches | 28 inches | 29 inches |
| Weight | 300 lbs | 500 lbs | 850 lbs | 850 lbs | 150 lbs |
Rails installed quickly and aligned perfectly.
Smooth sliding rails for maintenance access.
Solid construction and easy fit.
Saved time during rack installation.
Good quality rail kit.
The HPE 1U LFF Gen9 MOD Easy Install Rail Kit (789388-B21) is a tool-less, sliding rail assembly designed to mount Gen9 1U servers in standard 19″ racks quickly and securely.
The 789388-B21 rail kit is compatible with HPE ProLiant DL360 Gen9 and DL360e Gen9 1U rack servers featuring large form factor (LFF) drive support.
Yes, the MOD Easy Install design enables tool-less installation, allowing rails to snap into rack posts and server chassis with no extra hardware.
Slide the outer rail into the rack’s square holes, snap it in place, align the inner rail on the server chassis, then slide the server into the rack until it clicks.