Enhance your vessel's deck with the Lewmar Size 10 Ocean Series Hatch Flat Base, a robust solution engineered for seamless integration on flat surfaces. This hatch stands out in marine environments where reliable ventilation and natural light are essential, delivering the durability Lewmar is renowned for in offshore applications. Crafted from high-grade acrylic in a timeless Smoke Grey tint, it offers UV resistance and clarity that withstands harsh sea conditions without yellowing over time.

Superior Design for Flat Deck Installations

Designed specifically for flat surfaces with a precise tolerance of +/- 1mm, this hatch ensures a flush, watertight fit that's critical for maintaining structural integrity on yachts, sailboats, and powerboats. The square profile—measuring 12 3/4 inches by 12 3/4 inches—provides ample overhead light and airflow, making it ideal for cabins, heads, or galleys where space optimization matters.

Key advantages include its lightweight build at just 5.77 pounds, which minimizes added stress on deck structures, and the 3/8-inch thick acrylic window that balances strength with unobstructed views. Unlike curved base models, the flat base prioritizes straightforward mounting, but note it pairs exclusively without trim kits or roller shades to preserve its low-profile aesthetic.

Precise Dimensions and Cut-Out Guide

These measurements guarantee a custom-like fit; always double-check your deck's flatness and use a template for the cut-out to avoid errors during installation.

Installation Essentials

Securing this hatch is straightforward for experienced installers. At the hinge section, opt for M6 or 1/4-inch fasteners to handle the pivot smoothly. For the lower frame, 5mm countersunk screws (No.10 UNC or 2 BA) provide a secure, low-profile hold. Pro tip: Apply marine sealant around the frame perimeter for drip-free performance, and torque fasteners evenly to prevent warping. Ventilation hatches like this one open up to 90 degrees in the Ocean Series, promoting cross-breezes without obstructing headroom.

• Surface Prep: Sand to a smooth finish and ensure level within 1mm tolerance.
• Fastener Torque: Follow Lewmar guidelines to avoid over-tightening acrylic edges.
• Weatherproofing: Pair with EPDM gaskets for long-term sealing against salt spray.

Why Choose Lewmar Ocean Series?

Lewmar's Ocean hatches have powered countless bluewater voyages, earning praise for their anodized aluminum frames that resist corrosion and quick-action friction hinges for effortless operation. The Size 10 flat base excels in retrofits or new builds where aesthetics meet functionality—think sleek lines on a modern cruiser or reliable access on a rugged offshore racer. Its Smoke Grey acrylic cuts glare while inviting daylight below decks, improving comfort during extended passages.

Frequently Asked Questions