Edson Fold-Down Adapter 2-3/8" Mast

The Edson Fold-Down Adapter 2-3/8" Mast (Model 990-23) is a purpose-built marine hardware component designed to allow radar masts to fold down for reduced profile storage, trailer transport, and navigation under low-clearance bridges. Manufactured by Edson Marine, this adapter attaches directly to the base of a standard radar mast and enables operators to lower equipment quickly without disassembly, preserving structural alignment and electrical integrity across multiple deployment cycles.

The 2-3/8" mast diameter specification ensures compatibility with Edson's standard radar mast lineup. When paired with an optional 992-35 Pivot Bracket (sold separately), this adapter enables alternative mounting configurations, including raked transom and coaming-side installations—critical for vessels where vertical mast mounting is impractical or undesirable. For vertical surface mounting, users can integrate a 989-1 Right Angle Base (sold separately) to adapt the fold-down mechanism to non-standard geometry. The compact form factor—6 x 4 x 6 inches, weighing 0.7 lbs—minimizes storage footprint while maintaining robust load-bearing geometry.

This adapter is essential for operators managing multi-season vessel operations, trailer-based offshore platforms, and installations where mast height variability impacts navigation clearance or security posture. Coast Guard auxiliary personnel, commercial fishing crews, and tactical maritime units benefit from the rapid deployment and stowage capability without requiring complete system re-rigging. End-of-season winterization becomes faster and more damage-resistant with a fully retracted radar configuration.

Edson Marine has established itself as the standard in marine antenna and mast hardware across U.S. naval, commercial, and recreational sectors. This fold-down adapter reflects proven engineering for saltwater exposure, thermal cycling, and repeated mechanical articulation—factors that quickly degrade inferior hardware in marine environments.