Middle Atlantic SFD-KEY Front Door Key B399 Rack

Product Description

The MIDDLE ATLANTIC - U.S. - LEGRAND SFD-KEY is a replacement front door key designed for the B399 rack enclosure. This key restores secure access to the front door latch on compatible Middle Atlantic rack cabinets. It is a direct OEM-style replacement, sold individually, and is the correct solution when the original key is lost, damaged, or when a spare is needed for a multi-technician installation. AV integrators, IT infrastructure techs, and low-voltage installers working with Middle Atlantic rack systems will find this a straightforward field fix.

The SFD-KEY applies specifically to the B399 rack enclosure front door lock. It is suited for commercial and residential AV equipment rooms, server closets, and rack installations where the B399 enclosure is deployed. Having a spare key on hand is standard practice in managed rack environments to avoid access delays during service calls.

Key Features

• Direct replacement key for the B399 rack enclosure front door lock
• Sold individually as a single unit for targeted replacement
• OEM-style fitment ensures proper operation of the existing lock cylinder
• Compact form factor for easy storage in a service bag or parts kit

Compatibility

Designed as a replacement front door key for the Middle Atlantic B399 rack enclosure. No other compatible models were specified in the product data.

Installation Notes

This key requires no tools or modification to use. Simply insert into the existing front door lock cylinder of the B399 enclosure. If the lock cylinder itself is damaged or non-functional, the lock mechanism may require separate service before this key will operate correctly. Low-voltage and AV installation technicians are the typical service personnel for rack enclosure hardware.