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5U rails made ML350 servicing much easier.
790357-B21
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HP ML350 Gen9 5U Rail FIO Kit
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Name:
790357-B21
- Description:
- HP ML350 Gen9 5U Rail FIO Kit
- Rating:
Added to cart 28 times recently
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- Brand:
- Hpe
- Condition:
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790357-B21 Overview
790357-B21 is an enclosed cabinet rack designed for floor standing applications in data centers, network closets, telecom racks, and AV equipment. It offers a 42U height, features a standard 19-inch mounting with a rack depth in the 600–800mm range, and provides secure cable management along with a vented door and passive cooling support to ensure optimal airflow.
The cabinet is constructed from cold-rolled steel and is equipped with included casters and leveling feet for enhanced mobility and stability. Additionally, it incorporates a front door locking mechanism, tool-less side panels, and expansion-ready rails, all while supporting a weight capacity of 501–1000 lbs for demanding IT and telecommunications applications.
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Request bulk order quote for 790357-B21 for additional pricing. Browse the full Hpe Racks series or explore all Hpe products.
790357-B21 Specifications
- Product Type
- Rack
- Rack Type
- Enclosed Cabinet
- Mounting Type
- Floor Standing
- Rack Height (U)
- 42U
- Use Case
- Data Center / Networking Closet / Telecom / AV Rack
- Rack Width
- 19-inch
- Rack Depth
- 600–800mm
- Weight Capacity
- 501–1000 lbs
- Material
- Cold-Rolled Steel
- Door Type
- Vented Door
- Side Panels
- Tool-less
- Cable Management
- Included
- Cooling Support
- Passive Ventilation
- Locking Mechanism
- Front Door Lock
- Casters
- Included
- Leveling Feet
- Included
- Rails Included
- Yes
- Expansion Ready
- Yes
- Grounding Kit Included
- Yes
- Color
- Black
- Compliance
- UL Listed / CE
- Product Name
- 790357-B21 Enclosed Server Cabinet
- Height
- 78 inches
- Width
- 24 inches
- Depth
- 36 inches
- Weight
- 450 lbs
790357-B21 Use Case
Streamlined Rack Installation for VMware vSphere Clusters with 790357-B21-HP ML350 Gen9 5U Rail FIO Kit
In a Fortune 500 data center migration to VMware vSphere, IT operations teams deploy 20 HP ML350 Gen9 servers across five 42U racks using the 790357-B21-HP ML350 Gen9 5U Rail FIO Kit. The front I/O rail design enables tool-less mounting, consistent alignment, and clear cable routing for network and storage connections. Outcome: 40% faster rack integration, optimized airflow for peak virtualization performance, and simplified server maintenance cycles.
High-Density HPC Cluster Assembly Using 790357-B21-HP ML350 Gen9 5U Rail FIO Kit
A university research lab builds a 50-node High-Performance Computing cluster to run complex simulations. By leveraging the 790357-B21-HP ML350 Gen9 5U Rail FIO Kit, engineers densely pack ML350 Gen9 servers in 42U racks with front-mounted I/O for InfiniBand and Ethernet interconnects. Outcome: 25% increase in compute density per rack, rapid slide-in access for node replacement, and improved thermal consistency under full load.
Rapid Edge-Data-Center Rollout for Retail Analytics with 790357-B21-HP ML350 Gen9 5U Rail FIO Kit
A nationwide retail chain deploys mini edge-data centers in 200 stores to support real-time inventory analytics and POS systems. Field technicians use the 790357-B21-HP ML350 Gen9 5U Rail FIO Kit to mount servers in compact network cabinets, ensuring secure front-I/O connections and tool-free servicing. Outcome: 60% reduction in on-site installation time, standardized hardware rollouts across locations, and enhanced system availability for critical retail operations.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 790357-B21 |  BW913A |  872225-B21 |  Q7G16A |  734807-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 / Telecom / AV Rack | Data Center / Networking Closet / AV Rack / Telecom | Data Center | Data Center | Data Center / Networking Closet / Telecom / AV Rack |
| Rack Width | 19-inch | 19-inch | 23-inch | 19-inch | 19-inch |
| Rack Depth | 600–800mm | 800–1000mm | 800–1000mm | 600–800mm | 600–800mm |
| Weight Capacity | 501–1000 lbs | 1001–2000 lbs | 2000+ lbs | 1001–2000 lbs | 501–1000 lbs |
| Material | Cold-Rolled Steel | Cold-Rolled Steel | Cold-Rolled Steel | Cold-Rolled Steel | Cold-Rolled Steel |
| Door Type | Vented Door | Vented Door | Vented Door | Vented Door | Vented Door |
| Side Panels | Tool-less | Fixed | Removable | Removable | Removable |
| Cable Management | Included | Included | Included | Tool-less | Included |
| 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 | Included | Optional | Optional | No | Optional |
| 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 | UL Listed / CE | RoHS / UL Listed / CE | EIA-310-D / RoHS / UL Listed | UL Listed | UL Listed |
| Product Name | 790357-B21 Enclosed Server Cabinet | BW913A Enclosed Server Rack | 872225-B21 Enclosed Network Rack | Q7G16A Enclosed Network Rack | 734807-B21 Enclosed Server Rack Cabinet |
| Height | 78 inches | 78 inches | 78 inches | 76 inches | 84 inches |
| Width | 24 inches | 24 inches | 23 inches | 24 inches | 24 inches |
| Depth | 36 inches | 39 inches | 38 inches | 30 inches | 30 inches |
| Weight | 450 lbs | 800 lbs | 300 lbs | 400 lbs | 350 lbs |
Reviews & Ratings
N
Noman Siddiq
5
OEM rails fit perfectly.
R
Robert Klein
4
Smooth sliding action.
J
Jason Patel
4
Sturdy and reliable.
A
Anders Holm
5
Good quality rail kit.
Questions & Answers
What is the HP ML350 Gen9 5U Rail FIO Kit (SKU: 790357-B21)?
The HP ML350 Gen9 5U Rail FIO Kit (790357-B21) is a factory-integrated, toolless rack-mount rail assembly designed to mount an HP ProLiant ML350 Gen9 server into a standard 5U four-post rack.
Which server models are compatible with the 790357-B21 rail kit?
The 790357-B21 rail kit is compatible exclusively with HP ProLiant ML350 Gen9 series servers and is not supported on previous or newer ProLiant generations.
What rack types does the ML350 Gen9 5U Rail FIO Kit support?
It supports EIA-310-E compliant four-post racks with square, round or threaded hole mounting-profiles and accommodates rack depths from 600 mm to 1,000 mm.
Are the rails in the FIO Kit toolless?
Yes, the HP ML350 Gen9 5U Rail FIO Kit features a toolless, quick-release design for fast front-to-rear rail installation without additional tools.
What components are included in the 790357-B21 kit?
The kit includes two adjustable front-to-rear rail assemblies, mounting brackets, retaining clips and all required hardware for a complete server installation.
How much weight can the HP ML350 Gen9 rails support?
Each rail assembly supports up to 45 kg (99 lb), accommodating the fully populated HP ProLiant ML350 Gen9 server and internal components.
Can I install the rails from the front of the rack only?
Yes, the toolless front-release levers allow you to extend and secure the ML350 Gen9 rails from the front of the rack without accessing the rear posts.
Do I need cable management arms (CMAs) with this rail kit?
No. The 790357-B21 FIO Kit does not include CMAs; HP recommends optional CMA accessories for advanced cable routing and strain relief.
Is a rear support bracket required for shallow racks?
In racks under 600 mm depth, a rear support or bracket is required. For depths below 600 mm, use an HP short-rack mount kit or adjust rail length accordingly.
How do I install the HP ML350 Gen9 server on these rails?
Slide the rails into the rack rails until they click, adjust the front rail brackets to rack posts, then slide the server into the fixed rails until it locks into place.
Can the 790357-B21 rails be used with other ProLiant Gen9 tower servers?
No. This FIO Kit is engineered exclusively for the ProLiant ML350 Gen9 chassis and is not compatible with other Gen9 tower or rack server models.
What is the FIO designation in the rail kit name?
FIO stands for Factory Integration Option, indicating the rails ship pre-installed or bundled with the server at the factory for simplified deployment.
Where can I purchase the HP ML350 Gen9 5U Rail FIO Kit?
You can order SKU 790357-B21 through HP authorized resellers, the official HPE Parts Store or certified channel partners.
Does the rail kit require any firmware or software updates?
No. The rail kit is a mechanical accessory and does not require any firmware or software updates to function.
What’s the warranty coverage for the 790357-B21 rail assembly?
The HP ML350 Gen9 5U Rail FIO Kit is covered under the server’s standard HPE warranty and support terms when purchased together.
Can I convert these rails to sliding rails for maintenance?
No. The 790357-B21 rails are fixed-length, toolless static rails and do not offer a sliding or ball-bearing function.