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Cooler Master MasterBox NR400 Micro-ATX Tower with Front Mesh Ventilation, Minimal Design, Tempered Glass Side Panel and Single Headset Jack

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In stock.
Ships from Canada.
Most customers receive within 4-8 days.
  • N200
  • NR400
  • Silencio S600
  • Silencio S600 TG
  • ATX Mid Tower
  • MicroATX Tower
  • Optimal Thermal Performance - Full mesh front panel and ventilated top panel for high thermal performance.
  • Flush Tempered Glass Side Panel Design - Fastened by thumbscrews on the rear panel, keeps the surface flush and unobstructed.
  • Graphics Card Support Up To 346mm - Generous clearance space to support the latest graphics cards.
  • Headset Jack - The single 4 pole headset jack features both audio and microphone capabilities simultaneously.
  • Cable Management - High quality rubber grommets are paired with 22mm of clearance behind the motherboard.
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c0_Cooler Master MasterBox NR400 with ODD

Cooler Master MasterBox NR400 with ODD

Form & Function Streamlined

A minimalistically-designed, compact case engineered for micro-ATX and mini ITX platforms. The meshed front panel pairs with a pre-installed front intake fan and rear outtake fan to create efficient airflow. A tempered glass side panel lets you admire and showcase your neat, clean build, which is achieved by cable routing space behind motherboard tray and a power supply shroud hiding cables and drives. Although with compact dimensions, the inside of the chassis is smartly arranged to accommodate high-performance components, while also offering flexibility to configure air or water cooling as needed. For easy access, two USB ports, a reset button, a Cooler Master logo-shaped power button, and a 4-pole headset jack are located on the top of the case.

Minimalistic Design

The MasterBox NR400 is a pure and simple design that is focused on airflow performance. A single-layer, fine mesh makes up the entire front panel, achieving efficient airflow while also acting as a dust filter.

1_Minimalistic Design

Seamless Tempered Glass

The tempered glass side panel sits completely flush against the chassis, mounted securely and discreetly by a system of tabs and thumbscrews.

2_Seamless Tempered Glass

Ample Storage Support

A total of 4x 2.5" and 3x 3.5" drives can be mounted using a tool-less system. Storage can be mounted on the PSU shroud, behind the motherboard tray, and within the versatile HDD cage.

* An extra 3.5" drive can be mounted only on the ODD version (pictured).

3_Ample Storage Support

Versatile HDD Cage

The HDD cage is (re)movable. The cage can be shifted forward to make room for a longer PSU, backwards for additional radiator space, or completely removed if HDD storage is not needed.

4_Versatile HDD Cage

Headset Jack

The single 4 pole headset jack features both Audio and Microphone capabilities simultaneously so that separate jacks are not needed.

5_Headset Jack

Fan Support

  • Front: 120mm x3 / 140mm x2
  • Top: 120mm x2 / 140mm x2
  • Rear: 120mm x1
  • * non ODD version
6_Fan Support

Radiator Support

  • Front: 120/140/240/280mm
  • Top: 120/240mm
  • Rear: 120mm
  • * non ODD version
7_Radiator Support
8_component clearance

Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Return Policies