Middle Atlantic PROMRK-RR44 44U Cage Nut Rack Rails for MRK/VRK Series
Overview
The PROMRK-RR44 is a replacement or upgrade pair of 44U cage nut rack rails designed specifically for Middle Atlantic MRK and VRK series enclosures. At 77 inches tall, these rails span a full 44-space rack column — the right fit when you're building out a deep AV or security equipment rack and need a verified replacement set rather than a generic aftermarket substitute. The 3/8-inch square hole pattern and heavy-gauge .13-inch steel construction mean equipment stays firmly seated under load, with none of the flex you get from lighter-gauge rail stock. Sold as a pair, so one order completes both sides of a single rack column.
Compatibility
Designed for Middle Atlantic MRK Series and VRK Series rack enclosures. Both series use the same 3/8-inch square hole cage nut mounting standard, so the PROMRK-RR44 drops in without modification. If your enclosure is outside these two families — for example, a non-Middle Atlantic open-frame rack or a third-party cabinet — verify the hole pattern and rail channel dimensions before ordering; this rail is not a universal fit. The 44U / 44-space depth matches a 77-inch rail run, so confirm your enclosure's usable rail height before purchasing a different RU count.
Installation Notes
Rails are steel, black finish, and mount cage-nut style — standard M6 cage nuts (not included) press into the 3/8-inch square holes to accept rack screws. Each rail measures 1.406 inches wide by 1.375 inches deep, which matches the channel geometry of the MRK/VRK enclosure frame. No special tooling required beyond a cage nut insertion tool and standard rack screws. Confirm your existing cage nuts and screws are on hand before beginning the swap, as the PROMRK-RR44 ships rails only.
What's in the Box
- 2x 44U cage nut rack rails (one pair)
