3U Rackmount Chassis

A 3U rack size refers to a unit of measurement equaling three standard rack units. Each rack unit (U) is 1.75 inches tall, so 3U equals 5.25 inches of vertical rack space. The width is standardized at 19 inches for compatibility with EIA-310d compliant rack enclosures across the industry.

A 3U chassis is 5.25 inches (approximately 133 mm) tall. This is derived from the EIA-310d standard, where each rack unit equals 1.75 inches. Ron Nunes chassis conform to this standard, ensuring precise fit in any standardized 19-inch rack enclosure used in data centers, labs, and defense installations.

Ron Nunes offers 3U rackmount chassis in depths of 8, 12, 14, 20, and 26 inches, with custom depths available upon request. This range accommodates diverse equipment from shallow panel assemblies to deep server or instrumentation enclosures, ensuring flexibility for both standard and specialized rack deployments.

Yes. Ron Nunes offers MIL-C-5541E Type I Class 3 Chemical Film (gold) finish on aluminum chassis, meeting military and government specifications. Handle components feature anodize finish per MIL-A-8625E, Class 2, Type 2. These options make the chassis suitable for defense, government lab, and mission-critical field applications.

Yes. Ron Nunes provides custom chassis configurations including non-standard depths, special finishes, and assembled systems built by Class A/XX certified welders. Engineering support is available to design solutions from prototype through full production runs, accommodating OEM integrators, defense contractors, and specialized industrial applications.

Chassis panels are fabricated from 0.125-inch thick aluminum sheet, Alloy 6061-T6, conforming to QQ-A-250/11 and ASTM B209. Chassis plates use Alloy 5052-H32. Stainless steel options in 14/16 gauge are also available. All materials meet applicable federal and ASTM specifications, ensuring structural integrity for demanding environments.