Vertiv CMR-45U12-W-1224 45U Rack Mounting Rail Kit — Winter White
Overview
The Vertiv CMR-45U12-W-1224 is a 45U rack mounting rail system in Winter White finish, designed for structured equipment installations where post color and hole pattern need to match an existing cabinet environment. At 12 inches of usable depth, this rail profile suits shallower rack footprints — patch panels, KVM switches, cable management hardware, and similarly shallow 1U/2U devices fit cleanly without wasted depth. The CMR-45U12-W-1224 is part of Vertiv's Vertiv rack infrastructure line, a range built around consistent hole patterns and finish options across unit heights.
This rail kit supports both #12-24 tapped and 3/8-inch square (M6) hole patterns — the two most common cage nut formats in North American and international cabinet ecosystems. That dual compatibility means you're not locked into a single hardware type when mixing equipment from different vendors, which is the reality in most enterprise and security head-end rooms.
Key Features
- 45U height: 45U of mounting space accommodates a dense mix of 1U and 2U equipment — enough vertical real estate for a mid-size surveillance head-end or network aggregation stack without requiring a full floor-standing enclosure.
- 12-inch depth: The 12-inch rail depth keeps the footprint compact. This works for patch panels, 1U switches, and cable managers; verify equipment depth before mounting servers or deep storage appliances.
- Winter White finish: White posts integrate cleanly into light-colored or open-office environments where black rack hardware would stand out. Consistent with Vertiv's CMR finish options across the product family.
- #12-24 tapped mounting: Tapped holes eliminate the need for cage nuts on compatible equipment — faster builds, fewer loose parts, one less variable during a rack-and-stack. Standard for many legacy and mid-range commercial devices.
- 3/8-inch square (M6) hole pattern: M6 square holes accept standard cage nuts and clip nuts, making this rail compatible with the majority of modern rackmount equipment from security NVRs to managed switches.
- Part of the Vertiv CMR family: The CMR series spans multiple heights (45U, 52U, 59U) and depths (6\", 10.5\", 12\", 16.25\"), so future rail additions or replacements can match the same spec line without sourcing a different product family. Browse the full rack and network accessories category for compatible hardware.
Integration and Compatibility
The CMR-45U12-W-1224 is engineered to work within Vertiv's broader cabinet and rack ecosystem. When planning a rack build, pair these rails with compatible rack enclosures and power distribution units to keep the installation clean and consistent. The dual hole pattern (tapped #12-24 and M6 square) covers the vast majority of rackmount equipment sold in North American and European markets — verify your equipment's mounting spec against the rail pattern before ordering if you're working with metric-only hardware.
If your build requires a different height or depth, the CMR family includes variants at 52U and 59U, and depths from 6 inches to 16.25 inches — consult Vertiv's CMR series selector to confirm the right rail for your enclosure dimensions. Reviewing a rack planning guide before finalizing your hardware list can save a return trip to the supplier.
Frequently Asked Questions
Q: What hole patterns does the CMR-45U12-W-1224 support?
A: The CMR-45U12-W-1224 supports #12-24 tapped holes and 3/8-inch square (M6) holes — the two most common rack mounting formats in North American and international deployments.
Q: Is the CMR-45U12-W-1224 available in black?
A: The CMR series is available in both Black and Winter White finishes. The CMR-45U12-W-1224 is the Winter White variant; the equivalent black version uses a different suffix in the Vertiv CMR part number structure.
Q: What is the usable depth of the CMR-45U12-W-1224?
A: The CMR-45U12-W-1224 provides 12 inches of usable rail depth. This suits patch panels, 1U switches, cable managers, and similar shallow-profile equipment. Deep servers or storage appliances may require a 16.25-inch depth variant.
Q: Can the CMR-45U12-W-1224 be used with cage nuts?
A: Yes. The 3/8-inch square (M6) hole pattern accepts standard cage nuts and clip nuts. The #12-24 tapped holes do not require cage nuts — equipment with #12-24 screws threads directly into the tapped post.
Q: Are other heights available in the same CMR family?
A: Yes. The Vertiv CMR series is available in 45U, 52U, and 59U heights, and in depths of 6\", 10.5\", 12\", and 16.25\". Select the variant that matches your enclosure spec.
The CMR-45U12-W-1224 comes up regularly in surveillance head-end builds where the integrator is working inside an open-frame or light-colored enclosure and needs the rail color to match. The Winter White finish is not cosmetic-only — in environments where equipment is visible to facility staff or tenants, a mismatched black post in a white cabinet draws complaints. The 12-inch depth is the spec to pressure-test before you order: it's enough for 1U network gear and patch panels, but not for most 2U NVRs or deep UPS units.
Technical Highlights:
- Dual hole pattern (#12-24 tapped + M6 square): covers both legacy tapped-rail hardware and modern cage-nut equipment in a single rail — no need to source different posts for mixed vendor builds.
- 45U height: gives you enough vertical space for a real head-end stack: 1U switch, patch panel, NVR, KVM, and PDU without fighting for space.
- CMR family depth range (6\"–16.25\"): if 12 inches turns out to be too shallow for a device in your BOM, there is a direct drop-in replacement at 16.25 inches in the same finish and hole pattern — no need to re-source from a different product line.
Deployment Considerations:
- Confirm your NVR or server chassis depth against the 12-inch rail before ordering — many 2U NVRs run 14–17 inches deep and will overhang or not mount cleanly on a 12-inch rail.
- The CMR-45U12-W-1224 part number encodes its key parameters: 45U height, 12-inch depth, W for Winter White, 1224 for #12-24 thread. If you're ordering multiples, double-check that each line item on your PO matches the enclosure spec — the family variants share a nearly identical part number structure and are easy to transpose.
This rail is the right call for a white open-frame head-end rack in a clean-room, NOC, or light-commercial security closet where a 12-inch depth BOM has already been validated. If your equipment list includes anything deeper than 12 inches, step up to the 16.25-inch variant in the same CMR family before you're on-site trying to force a mount.
