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Zachary Hill
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Rails installed quickly and aligned perfectly.
789388-B21
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1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI
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Name:
789388-B21
- Description:
- 1U LFF GEN9 MOD EASY INSTALL RAIL KIT PL=SI
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- Brand:
- Hpe
- Condition:
3 Year Extended Warranty
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789388-B21 Overview
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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Request bulk order quote for 789388-B21 for additional pricing. Browse the full Hpe Racks series or explore all Hpe products.
789388-B21 Specifications
- Product Type
- Rack
- Rack Type
- Enclosed Cabinet
- Mounting Type
- Floor Standing
- Rack Height (U)
- 42U
- Use Case
- Data Center / Networking Closet / AV Rack / Telecom
- Rack Width
- 19-inch
- Rack Depth
- 800–1000mm
- Weight Capacity
- 501–1000 lbs
- Material
- Steel
- Door Type
- Vented Door
- Side Panels
- Fixed
- Cable Management
- Included
- Cooling Support
- Passive Ventilation
- Locking Mechanism
- Front Door Lock
- Casters
- Optional
- Leveling Feet
- Included
- Rails Included
- Yes
- Expansion Ready
- Yes
- Grounding Kit Included
- Yes
- Color
- Black
- Compliance
- RoHS
- Product Name
- 789388-B21 Enclosed Server Rack Cabinet
- Height
- 73.5 inches
- Width
- 24 inches
- Depth
- 36 inches
- Weight
- 300 lbs
789388-B21 Use Case
High-Efficiency Data Center Rack Upgrades with 1U LFF Gen9 Rail Kit
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.
Accelerated Remote Branch Server Rollout for Retail Networks
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.
Streamlined Maintenance in High-Density Colocation Facilities
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 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 |
Reviews & Ratings
A
Adnan Qureshi
5
Smooth sliding rails for maintenance access.
B
Bruno Costa
5
Solid construction and easy fit.
D
Derek Lawson
5
Saved time during rack installation.
E
Emilio Vargas
5
Good quality rail kit.
Questions & Answers
What is the HPE 1U LFF Gen9 MOD Easy Install Rail Kit (SKU 789388-B21)?
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.
Which servers are compatible with the 789388-B21 rail kit?
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.
Can I install the rail kit without any additional tools?
Yes, the MOD Easy Install design enables tool-less installation, allowing rails to snap into rack posts and server chassis with no extra hardware.
How do I install the 1U LFF Gen9 MOD Easy Install Rail Kit?
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.
What load capacity does the HPE 789388-B21 rail kit support?
The rail kit supports up to 25 kg (55 lb) of server weight, covering fully populated Gen9 1U servers with drives and power supplies.
Does this rail kit work with non-HPE racks?
Yes, it fits any standard 19″ EIA-310 compliant rack with square or round mounting holes spaced at 1U intervals.
What components are included in the rail kit package?
The package includes two outer rack rails, two inner server rails, mounting clips, retention brackets and installation instructions.
Is a cable management arm required for this rail kit?
No, the 789388-B21 kit does not include a cable management arm, but you can add HPE cable management accessories separately.
How do I remove the server from the sliding rails?
Pull the release latches on each rail, slide the server out to full extension, then lift it off the inner rails.
What maintenance is required for these rail assemblies?
Periodically inspect and clean the sliding tracks and latches with a lint-free cloth; no lubrication is typically necessary.
Do the rails offer a locking mechanism to secure servers?
Yes, integrated latch locks on each rail secure the server in the rack and prevent accidental ejection during operation.
What are the physical dimensions of the rail kit?
The outer rails measure 742 mm depth, 43 mm height and 44 mm width, fitting standard 1U rack units.
How do I verify compatibility before purchasing the rail kit?
Check your server model against the HPE Parts Compatibility Matrix or consult HPE support using SKU 789388-B21 for confirmation.
What warranty covers the HPE 1U LFF Gen9 rail kit?
The rail kit is backed by HPE’s standard three-year parts warranty for genuine HPE rail accessories.
Where can I purchase genuine HPE 789388-B21 rail kits?
Order directly from HPE authorized resellers or the HPE Parts Store online for guaranteed authenticity and warranty coverage.