Bomar Marine Deck Plate

Bomar Marine Deck Plates: Built to Lock Out the Sea

When it comes to reliable, watertight below-deck access, few names carry the weight that Bomar does. A leading manufacturer of hatches and portlights since 1947, Bomar has spent decades engineering marine closures that perform in the world's most demanding saltwater environments — and their marine deck plates are a prime example of that commitment to craft.

Two Distinct Product Lines for Every Application

Bomar's deck plate lineup spans two well-defined series, each purpose-built for a specific type of boater or build:

• Commercial Grade Series (Cast Aluminum): Bomar uses 535 magnesium hardened aluminum to construct their Commercial Grade Series cast deck plates. The raw Almag-35 is heated to 1,100°F at the Bomar foundry and poured into proprietary cast molds, then professionally assembled in-house with 316L marine-grade stainless steel fasteners. These deck plates feature rugged Almag-35 cast aluminum construction with stainless steel T-handles and optional powder coating, and are designed for high-load areas where long-term durability is non-negotiable.
• Gray Series (Polypropylene): The Gray Series deck plates are constructed from Bomar's proprietary engineering-grade polypropylene resins — a material ideal for harsh marine environments due to its lightweight nature, structural rigidity, and long-lasting durability. This series is a go-to solution for OEM builders and recreational boaters who need reliable, easy-to-install access without the added weight of metal.

Engineering Details That Matter Underway

Bomar deck plates resist UV, impact, and saltwater, delivering tough, watertight access where reliability matters most. From molded press-in lids to locking aluminum hatches, they offer a range of finishes, sizes, and mounting styles to match virtually any build specification.

The polymer-bodied models, like the popular G845 series, take durability a step further: the high-impact UV-stabilized polycarbonate construction is acetone resistant, and the center cap uses a fingertip lift and twist-lock mechanism with an O-ring seal to help keep water out. A non-skid center plate improves grip and deck safety — a detail that matters when decks are wet and footing is critical.

Trusted by Professionals, Proven in the Field

Trusted by OEMs, boatyards, and commercial operators around the world, Bomar deck plates are field-tested and fleet-approved — manufactured and engineered in the USA, backed by decades of real-world use. Whether you're maintaining a recreational cruiser, outfitting a sportfisher, or specifying parts for a commercial fleet, Bomar's deck plates deliver the sealing integrity and material quality that professionals depend on.

Bomar also offers replacement parts such as gaskets, dogs, handles, and lenses for most deck plates produced after 1999, making long-term ownership and maintenance straightforward. Explore the full Bomar brand page to see their complete range of marine hardware, or browse all marine deck plates to compare options across manufacturers.