Discover the Sleek Performance of the Lewmar Size 50 Low Profile Hatch

Engineered for modern boats where style meets functionality, this Lewmar Size 50 Low Profile Hatch with flange base delivers a seamless integration into your deck. Its ultra-low 1-inch height minimizes wind resistance and creates a streamlined silhouette, perfect for sailboats, yachts, or cabin cruisers seeking that premium, factory-fresh look. The smoke grey acrylic window not only resists yellowing from UV exposure but also provides optimal light diffusion while maintaining privacy below deck.

Crafted with marine-grade durability in mind, the self-supporting design eliminates the need for additional gas struts in most applications, simplifying your setup while ensuring reliable operation in rough seas. At just 10.6 pounds, it's lightweight enough for easy handling during installation yet robust enough to withstand the rigors of coastal cruising or offshore adventures.

Key Features That Set It Apart

• Low Profile Aesthetics: Only 1 inch high, blending effortlessly with curved decks for a custom-built appearance.
• Smoke Grey Acrylic: 5/16-inch thick for superior impact resistance and clarity that lasts season after season.
• Self-Supporting Mechanism: Stays open securely without props, ideal for quick ventilation access.
• Flange Base Design: 9/16-inch lower frame ensures a watertight seal and straightforward mounting on flat surfaces.
• Generous Opening: Radiused corners prevent stress cracks, enhancing longevity in harsh marine environments.

Boat owners rave about how this hatch transforms cabin ventilation—fresh air flows freely without the bulk of traditional models, making it a favorite for liveaboards and weekend warriors alike.

Precise Dimensions for Perfect Fit

Measure twice for a flawless install. This hatch's footprint is thoughtfully proportioned to replace older models without extensive modifications.

Note: Overall dimensions include the flange base. Always verify your deck's flatness within +/- 1mm tolerance for optimal sealing.

Effortless Installation Guide

Installing this hatch is straightforward for DIY-savvy boaters. Prep your deck surface to ensure it's flat, then secure the hinge section with M6 (1/4-inch) fasteners. For the lower frame, opt for 5mm countersunk screws (No. 10 UNC or 2 BA equivalent) to achieve a clean, flush finish. Apply marine sealant around the cut-out for impenetrable waterproofing.

1. Template and cut the opening precisely using the provided dimensions.
2. Dry-fit the hatch to confirm alignment.
3. Seal and fasten per specs—torque evenly to avoid warping.
4. Test the self-supporting action and operation before launch.

Pro tip: In high-vibration areas, add lock washers to prevent loosening over time. Most installs take under two hours with basic tools.

Why Boaters Trust Lewmar for Ventilation Excellence

Beyond specs, this hatch shines in real-world use. The smoke grey tint reduces glare during midday sunbathing on deck, while the thick acrylic shrugs off accidental bumps from dock lines or crew traffic. Self-supporting means no fumbling with stays in a sudden squall—just flip it open for instant airflow. Pair it with companionways or dorades for superior cabin climate control, keeping mildew at bay even in humid tropics.

Regular upkeep is simple: Rinse with fresh water after saltwater exposure, and polish the acrylic annually with non-abrasive marine cleaners to maintain that crystal-clear view.

Frequently Asked Questions