RCB1065S-6U 6U 23in to 19in Rack Reducer Adapter - Heavy Duty Fit

In this review the RCB1065S-6U is presented as a straightforward solution for technicians and studio engineers who need to mount 19in equipment inside legacy 23in EIA-310 relay racks. The bottom line: it converts a 23in 2-post or 4-post cabinet to a standard 19in mounting width in a compact 6U height, and does so with heavy duty construction that feels built to last. For anyone retrofitting network switches, rackmount servers or audio gear, the adapter removes fitment headaches with simple screw or cage nut attachment.

Key Features

• 23in to 19in conversion: Reduces a standard 23in rack cabinet width by 2in on each side so 19in rackmount gear fits securely without modifying the cabinet.
• 6U height: Provides a compact mounting window for small server, switch or audio racks while preserving space elsewhere in the cabinet.
• Universal hole options: One end offers oblong holes for #10, #12 or M5 rack screws while the other accepts square cage nut holes for the same sizes, giving flexible mounting choices.
• Heavy duty steel: Built from 1.98mm thick steel with a galvanneal finish that resists wear and supports heavier equipment reliably.
• Fits EIA-310 racks: Designed specifically for any standard EIA-310 23in 2-post relay rack or 4-post cabinet used in telecom and studio environments.

Who It's For

The RCB1065S-6U is aimed at IT technicians, AV professionals and studio engineers who maintain mixed-width racks or need to integrate modern 19in switches and servers into older 23in relay racks. Its simple mechanical design makes it suitable for field retrofits and permanent cabinet updates.

Those who should look elsewhere include buyers needing a full-height conversion or integrated cable management features, and users who require tool-less or adjustable depth mounting; this is a bolt-on adapter focused on width reduction and strength rather than extra functionality.

Pros & Cons

Pros

• Solid build quality from 1.98mm steel and galvanneal finish for durable support of rackmount equipment.
• Flexible fastening with oblong screw holes and square cage nut holes to match existing rack hardware preferences.
• Straightforward 6U size that fits easily into EIA-310 23in 2-post or 4-post racks with no cabinet modification.

Cons

• Limited to 6U height so it is not a solution when larger vertical capacity is required.
• Does not include cage nuts or screws, so additional hardware may be needed depending on your rack.

Specifications

Our Verdict

The RCB1065S-6U is a practical, value-oriented adapter for anyone needing to fit 19in equipment into a 23in EIA-310 rack without extensive modification. Its heavy duty 1.98mm steel construction and dual hole types make installation flexible and durable, though the fixed 6U size and lack of included fasteners are trade-offs to consider. For retrofits and studio or telecom racks where space is limited, it is a sensible, long-lasting choice.

Frequently Asked Questions

Will this fit in a 23in 2-post relay rack?
Yes, it is designed to fit into any standard EIA-310 23in 2-post relay rack as well as 4-post cabinets.

Can I use existing rack screws with this adapter?
Yes, one end accepts oblong holes for #10, #12 or M5 rack screws and the other end accepts square cage nut holes for the same sizes.

Is hardware included?
The adapter does not ship with cage nuts or screws, so plan to use your rack's existing hardware or obtain the appropriate #10/#12 or M5 fasteners.