9 kits in stock from $51.99 naming R640, R740 and R740xd machines. 7 state sliding rails. Check your rack's post type and depth before ordering - ReadyRails variants are not interchangeable between square-hole and threaded racks.
Prices updated · 9 kits in stock · 1 carry an OEM part number in an OEM listing
TIER 1 is an OEM listing quoting an OEM part number - the vendor selling its own part and naming it. TIER 2 is a SELLER CLAIM: an aftermarket kit asserting a fit, or an OEM-brand listing with no part number in it. Both are real purchases and neither is hidden. Only one of them is a documented fact.
1 of the 9 kits here reach Tier 1. That is what the shelf looks like, not a failure of the check - rails are an overwhelmingly aftermarket category, and a page that implied otherwise would be misdescribing what a buyer is about to click.
9 in-stock listings · a kit appears here if its own listing names a machine in this generation - many kits span several · every specification here is the maker’s own claim, read from the listing · refreshed every few hours
| Part | Provenance | Type | Part number | Price | |
|---|---|---|---|---|---|
BestParts BestParts-rails BestParts 2U Short Rail Kit Replacement for Dell Poweredge R720 R730 R740 | TIER 2 · SELLER CLAIM | sliding | not stated | $51.99 | Buy Now |
BestParts BestParts-rails BestParts New 1U Static Ready Short Rails Kit Compatible with Dell PowerEdge | TIER 2 · SELLER CLAIM | static | not stated | $54.99 | Buy Now |
BestParts BestParts-rails BestParts 1U Long Rail Kit Compatible with Dell Poweredge R640 R630 R620 | TIER 2 · SELLER CLAIM | sliding | not stated | $62.99 | Buy Now |
Dell CWJ0X Dell PowerEdge R620 R630 R640 R420 R430 R320 1U Sliding ReadyRails II Rail K | TIER 1 · OEM listing, OEM part number | sliding | CWJ0X | $79.99 | Buy Now |
Dell Dell-rails Dell 81WCD POWEREDGE R620 R630 R640 Sliding Ready Rails KIT | TIER 2 · SELLER CLAIM | sliding | not stated | $99.00 | Buy Now |
Dell Dell-rails Dell PowerEdge R530, R730, R730, R540, R740, R740XD, R820, R830, R7415, R742 | TIER 2 · SELLER CLAIM | sliding | not stated | $99.00 | Buy Now |
BestParts BestParts-rails BestParts Rail Kit Compatible with Dell Poweredge R540 R720 R730 R740 R750 | TIER 2 · SELLER CLAIM | sliding | not stated | $105.99 | Buy Now |
Dell Dell-rails Dell 8N0JT PowerEdge R340 R440 R640 1U Sliding Ready Rail Kit RENEWED | TIER 2 · SELLER CLAIM | sliding | not stated | $129.00 | Buy Now |
Dell Dell-rails Dell PowerEdge R340, R630, R640, R6415 1U Ready Rail Kit - 8N0JT | TIER 2 · SELLER CLAIM | not stated | not stated | $75.00 | Buy Now |
Dell's rail system for this era is branded ReadyRails and comes in variants that are not interchangeable. The distinction that matters most is between the static and sliding versions, and the second is what kind of rack post the rails were made for.
Square-hole racks, round-hole racks and threaded racks all exist, and a rail kit designed for tool-less mounting into square holes does not simply screw into a threaded rack. Some kits are convertible with an adapter, some are not, and this is the single most common reason a correctly identified kit still does not fit.
Second-hand listings compound this by describing rails generically. A kit sold as fitting an R730 might be either variant, and the photographs are frequently stock images. Where a listing states a part number we render it, because a part number resolves the question and a description does not.
Of the 9 kits here, the ones reaching Tier 1 are those where an OEM listing quotes an OEM part number. Everything else is a seller claim about fit - usable, and worth a question to the seller about post type before buying.
Rails are adjustable within a range and the range has ends. A kit specified for a rack depth of roughly 610 to 900mm will not mount in a 500mm-deep cabinet however carefully you measure the server.
This is the constraint that stops homelab buyers putting an enterprise 2U machine into a shallow wall-mount rack, and it is not solved by buying different rails - short-depth rail kits exist but the chassis itself is what it is, and a 2U PowerEdge is around 750mm long before you attach anything to the back of it.
Measure front post to rear post in your own rack, then compare against the rail kit's stated adjustment range. If the listing does not state a range, that is a question for the seller rather than an assumption to make.
The other measurement people forget is what is behind the rack. A server on sliding rails needs the depth of the machine plus its travel, and if the rack is against a wall the machine cannot come forward far enough to open.
Two kinds of rail, and the difference is whether the server can come out of the rack without being unbolted. Static rails hold the machine in place; to work on it you undo it and lift it out, which for a 2U server full of drives is a two-person job. Sliding rails let it roll forward on bearings while still connected, so the lid comes off in place.
For a machine that gets opened - drives swapped, cards added, memory changed - sliding rails are worth the difference and it is not close. For a machine that gets racked once and left, static rails are cheaper, shallower and lighter, and they do not have bearings to seize.
The cable management arm is the accessory sold alongside sliding rails, and it is the one most homelab buyers can skip. Its job is to route cables in a bundle that folds as the server slides, so the machine can be pulled out without unplugging anything. In a datacentre with a dozen cables per machine that is genuinely useful. With a power lead and one network cable, it is a large plastic object that obstructs airflow at the back of the rack.
Where a listing states that an arm is included we render that in the row. Where it does not, we render nothing rather than assuming either way - and if you are buying second-hand rails, whether the arm is in the box is worth asking before rather than after.
Dell PowerEdge 13G (R630, R730, R730xd) · HPE ProLiant Gen10 (DL360, DL380 Gen10) · Hot-swap PSUs · All server parts · Used servers · rack noise · rackmount UPS - same depth question, bigger consequences.
This page exists because the catalogue holds at least 3 kits naming a machine in this generation. Generations below that floor are not published.
Not necessarily. The variants differ by rack post type - square hole, round hole and threaded racks all exist, and a kit made for tool-less square-hole mounting does not screw into a threaded rack. Some are convertible with an adapter and some are not. Where a listing states a part number we show it, because a part number settles the question and a generic description does not.
Sliding if the machine gets opened - drives swapped, cards added - because the alternative is unbolting a heavy 2U chassis and lifting it out, which is a two-person job. Static if it gets racked once and left: cheaper, shallower, lighter, and nothing to seize.
Probably not in a homelab. Its purpose is to let a machine slide out without unplugging a dozen cables, which matters in a datacentre. With a power lead and one network cable it is a large plastic obstruction at the back of the rack, in the airflow path. Where a listing states an arm is included we show it; where it does not, we do not assume.
Check the kit's stated adjustment range against your rack's front-to-rear post measurement. A kit specified for roughly 610 to 900mm will not mount in a 500mm cabinet, and no rail choice makes a 750mm chassis shorter. Also check what is behind the rack - sliding rails need the machine's length plus its travel to be useful.