HPE 720865-B21 2U Cable Management Arm for Ball Bearing Rail Kit

• Brand: HPE
• HPE Option Part Number: 720865-B21
• Product Type: 2U Cable Management Arm
• Accessory Category: Rack / Rail Kit Accessory
• Rack Size: 2U
• Designed For: HPE Ball Bearing Rail Kit
• Rail Type: Ball Bearing
• Primary Function: Rear server cable management
• In-Rack Service Support: Designed for use with telescoping Ball Bearing Rail Kit installations
• Compatible Rail Kit Family: HPE 2U Ball Bearing Rail Kits
• Related SFF Ball Bearing Rail Kit: 720863-B21
• Related LFF Ball Bearing Rail Kit: 720864-B21
• Easy Install CMA Alternative: 733664-B21 - for Easy Install Rail Kit
• Compatibility - Ultra Short: Supported HPE 2U Ball Bearing Rail configurations
• Rail Kit Included: No; CMA is a separate accessory
• Cable Management Arm Included With Rail Kit: No; HPE identifies 720865-B21 separately
• Documented Platform Examples: Supported HPE ProLiant 2U rack-server configurations, including DL380/DL560 documentation
• Rack Standard Note: HPE rail documentation specifies HPE racks compliant with EIA-310-E; third-party rack compatibility must be independently validated
• Procurement Check: Confirm exact server, rail-kit SKU and rack configuration before ordering

Why Choose This Product?

• Purpose-built 2U CMA - Buyers get an accessory specifically identified for 2U Ball Bearing Rail Kit installations rather than adapting generic cable-management hardware.
• Better rack serviceability - Organized cable routing helps technicians move a compatible server forward on its telescoping rails without turning the rear cabling into an unmanaged obstruction.
• Correct rail-family matching - 720865-B21 is specifically associated with Ball Bearing Rail Kits, while HPE uses a different CMA SKU for Easy Install Rails. 
• Reduced cable-management risk - A dedicated arm helps keep server cables controlled during routine maintenance, reducing the likelihood of loose or poorly supported cabling.
• Exact OEM SKU - The 720865-B21 identifier simplifies procurement, replacement sourcing, asset records and maintenance documentation.
• Completes a rail installation - When a compatible HPE server has the Ball Bearing Rail Kit but requires cable management, this CMA provides the separately specified accessory.
• Useful for dense racks - Structured rear cable routing becomes increasingly valuable as rack density and the number of network, storage and power connections increase.
• Lifecycle maintenance value - Replacing a missing or damaged CMA can restore the intended physical cable-management arrangement without replacing the server or rail assembly.