How to Install Sliding Rack Rails on a Server
Dell ReadyRails II and HPE EasyRails are tool-less sliding rail kits that fit square-hole and round-hole standard 19" racks. This guide covers installation steps for both brands.
What You Need
- Compatible sliding rail kit (Dell ReadyRails or HPE EasyRails)
- Cage nuts (for round-hole racks)
- M5 or M6 rack screws if not included with rails
Step-by-Step Instructions
Step 1: Identify your rack hole type
Look at the rack mounting posts. Square holes = uses cage nuts. Round (threaded) holes = uses direct M5/M6 screws. Both Dell ReadyRails and HPE EasyRails support both — but the mounting bracket differs.
Step 2: Install rail brackets at correct U position
Decide the bottom U position for the server. Snap the rail bracket onto both the front and rear rack posts at the same U mark. The bracket should click into both posts.
Step 3: Extend the inner rails
Slide the inner rails fully out from the rack brackets. Each inner rail attaches to the side of the server chassis via pre-mounted pins on Dell, or screws on HPE.
Step 4: Lift the server onto the inner rails
Two-person lift recommended. Align the chassis side pins (Dell) or rail mounting points (HPE) with the inner rail slots. Push the server forward into the rails until you hear a click — the rails self-engage.
Step 5: Slide the server into the rack
Push the server backward into the rack along the rails. The rails will smoothly slide. When the server is flush with the rack front, the chassis ear thumbscrews can be tightened to lock the server in place.
Step 6: Test the slide and lock
Loosen the chassis ear thumbscrews. Slide the server forward (it should glide smoothly with both hands). Slide it back in. Tighten thumbscrews.
Frequently Asked Questions
Are Dell ReadyRails compatible with HPE rails?
No — rail kits are vendor-specific. Dell ReadyRails fit Dell PowerEdge servers; HPE EasyRails fit HPE ProLiant servers. Inner rails attach to the chassis via vendor-specific mounting points.
Do I need a cable management arm (CMA)?
Optional but useful for high-density racks. CMA folds the cables (power, network, console) so the server can slide forward for service without disconnecting. Adds $100-300 to the rail kit cost.
Can I use 3rd-party rails for a Dell server?
Generally no — the inner rail mounting on Dell chassis uses Dell-specific pins. 3rd-party shelf-mount kits exist but lose the slide-out service convenience.
Need the parts?
Pro Disk Network stocks all the parts referenced in this guide. Email sales@prodisknetwork.com with your server model — we will send a quote within one business day.