Middle Atlantic SRB-1-WMRK-3624 Seismic Riser Base for WMRK Bay Racks

Overview

The SRB-1-WMRK-3624 is a single-bay seismic riser base designed specifically for Middle Atlantic WMRK series open-frame bay racks. At 24 inches tall and 36 inches deep, it raises the rack assembly to a working height while providing a certified seismic anchoring foundation — the right component when your installation is in a seismic zone, healthcare facility, or any jurisdiction requiring OSHPD or ASCE 7-10 compliance. The base supports up to 1,000 lbs (453.6 kg) of seismic load, meaning a fully loaded rack won't exceed its structural rating under lateral event forces. Finished in textured black powder coat to match the WMRK rack family.

Compatibility

Designed for the Middle Atlantic WMRK bay rack series — specifically single-bay configurations where the rack footprint matches the 23.94 in (W) × 36 in (D) base footprint. Verify your WMRK rack's depth against the 36-inch base depth before ordering; Middle Atlantic offers alternate depth SRB variants for shallower rack configurations. This base is not a universal fit — it is dimensionally and structurally matched to the WMRK series only. If your project uses Middle Atlantic's BGR, MFSEL, or other open-frame lines, confirm compatibility against Middle Atlantic's SRB series compatibility matrix before specifying.

Installation Notes

Seismic certification under ASCE 7-10 and OSHPD #96-01027 is only valid when the base is installed per Middle Atlantic's seismic installation guidelines — anchoring to a structural floor element is required to realize the 1,000 lb rated capacity. The 75 lb shipping weight reflects the steel construction; plan for two-person positioning during installation. Mounting hardware requirements and anchor bolt specifications are documented in Middle Atlantic's seismic installation guide; do not substitute anchor hardware without verifying equivalency against the OSHPD certification conditions.