Middle Atlantic 7IN. Drawer with Lock 4 Rack Units Anodized Black Brushed Finish - D4LK

Middle Atlantic D4LK 4U Locking Rack Drawer — Anodized Black Steel

Overview

The Middle Atlantic D4LK is a 4-rack-unit locking steel drawer built for AV and security rack installations where you need secure, accessible storage for small tools, spare hardware, adapters, or documentation. At 15.56 inches of usable depth and a UL-rated 50 lb load capacity, the D4LK handles real working loads without sagging or binding — the kind of drawer that integrators reach for when they're building a rack that will outlast the equipment inside it. The D4LK ships in a matte anodized black brushed finish that blends cleanly into standard 19-inch rack enclosures without looking like an afterthought.

This is a Middle Atlantic product, part of their D-Series heavy-duty drawer line — a category Middle Atlantic has been refining for commercial integrators for decades. If you're specifying a rack enclosure and need secure onboard storage, this is the drawer that consistently shows up in professional builds.

Key Features

• 4 Rack Units (7 in. height): Four RU of vertical real estate is the practical minimum for a drawer that holds anything useful. Taller than a 1U or 2U shelf, the D4LK accommodates small UPS batteries, power strips, or stacked documentation binders — without dominating the rack's usable space.
• 50 lb UL-Rated Load Capacity: UL listing on the load spec matters — it's not a manufacturer estimate but a tested, listed value. A 50 lb rating means you can load this drawer with dense hardware (a stack of SFP modules, a bag of tools, spare cameras) without worrying about the slides failing under a real working load.
• Integrated Lock: The built-in lock restricts access to authorized personnel without requiring a separate lockable panel or an external hasp. In multi-tenant equipment rooms, shared data closets, or any space where rack access isn't fully controlled, this is the detail that prevents opportunistic tampering or unauthorized gear removal.
• 15.56 in. Usable Depth: Standard 19-inch rack enclosures often run 18–24 inches of interior depth. At 15.56 inches, the D4LK fits without modification in most mid-depth enclosures and leaves room for cable management behind the drawer — you're not forced to choose between the drawer and your rear cable runs.
• Steel Construction with Anodized Black Brushed Finish: The steel body resists flex under load, unlike ABS or thin-gauge aluminum alternatives. The anodized brushed finish resists corrosion and wear from repeated use — the surface won't flake or chip the way painted finishes do after a few years in a working rack.
• Standard 19 in. Width, 2-Point Mounting: Drops into any EIA-standard 19-inch rack on two mounting points. No adapter brackets, no special hardware — just mount and go. The 2-point mounting pattern is consistent with Middle Atlantic's broader rack accessory line, so it integrates cleanly into existing Middle Atlantic enclosure builds.
• 14.72 lb Product Weight: At under 15 lbs empty, the D4LK won't meaningfully shift your rack's center of gravity. Factor in up to 50 lbs of contents and you're still well within the load ratings of typical rack casters and floor mounts — no structural surprises during installation.

Integration & Compatibility

The D4LK mounts in any EIA-standard 19-inch rack enclosure that provides at least 4U of open space and 15.56 inches of interior depth clearance. It's a natural fit alongside Middle Atlantic's enclosure line — RK, WR, and PD series units all provide the rail geometry this drawer expects. For installations where the drawer will sit above heavy switching or UPS gear, confirm your rack's per-shelf load rating includes the combined drawer-plus-contents weight. The lock mechanism is keyed; coordinate with your site's key management policy before specifying multiples across a large installation. If you're building out a full rack system and need complementary rack power management, Middle Atlantic's PDU line pairs directly with this enclosure format. For broader guidance on structuring a rack build, the rack system planning guide covers depth, load, and cable management decisions that affect drawer placement.

Frequently Asked Questions

Q: What is the UL-rated load capacity of the D4LK?

A: The D4LK carries a UL-listed load capacity of 50 lbs (22.7 kg). This is a tested, listed value — not a manufacturer estimate — making it suitable for dense hardware storage in professional rack deployments.

Q: How many rack units does the D4LK occupy?

A: The D4LK occupies 4 rack units (7 inches of vertical height) in a standard 19-inch EIA rack.

Q: What is the interior depth of the D4LK drawer?

A: The drawer depth is 15.56 inches (39.5 cm). Verify your rack enclosure provides at least this depth of interior clearance before ordering.

Q: Does the D4LK include a lock, and what type is it?

A: Yes. The D4LK includes an integrated keyed lock that restricts drawer access. This is built into the drawer — no external hasp or add-on lock hardware is required.

Q: What finish does the D4LK have, and what is it made of?

A: The D4LK is constructed from steel with a black brushed anodized finish. This resists corrosion and surface wear better than painted steel alternatives in high-traffic rack environments.

Q: Will the D4LK fit in a standard 19-inch rack?

A: Yes. The D4LK is 19 inches wide and mounts via 2 standard rack mounting points, compatible with any EIA-310 compliant 19-inch rack enclosure.

Ted Perry

The Middle Atlantic D4LK earns its place in professional rack builds because of one underappreciated spec: the 50 lb UL-rated load capacity. Most integrators don't fill a drawer to capacity on day one, but knowing you have a tested, listed 50 lb rating means you can use this drawer for real working loads — spare SFPs, a power meter, a bag of punch-down tools — without second-guessing the slides.

Technical Highlights:

• UL-Listed 50 lb Capacity: Tested and listed — not a nominal marketing figure. Holds up under sustained heavy loading where cheaper stamped-steel drawers start to bind or sag at the slide mount points.
• 15.56 in. Depth: Deep enough to store a handheld toner, a rack kit bag, or a small power distribution strip flat, while still clearing most mid-depth enclosure rear cable management trays without modification.
• Integrated Keyed Lock: Built into the drawer face — no add-on hardware, no rattle, no loose lock body to deal with. One key manages access; coordinate key copies when deploying across multiple cabinets in the same facility.

Deployment Considerations:

• At 14.72 lbs empty plus up to 50 lbs of contents, account for 65 lbs of combined weight when calculating rack center-of-gravity on mobile caster-mounted enclosures — position the drawer low in the rack where possible.
• The 4U height is generous but carries a real cost in rack space. If you only need 1–2U of storage and your load will stay under 20 lbs, evaluate whether a shallower 2U option in the same Middle Atlantic family frees up rack space for active gear.

The D4LK is best deployed in fixed-position security or AV equipment rooms where multiple integrators or technicians share rack access — the lock disciplines who can reach in-cabinet consumables and tools without requiring a full locking enclosure door.