By MAURIPRO Rigging Specialists · Updated March 2026
Lewmar hatches represent the gold standard in marine ventilation and deck access solutions, combining decades of British engineering expertise with innovative design to deliver uncompromising performance in the harshest marine environments. MAURIPRO carries a comprehensive selection of Lewmar's premium hatch systems, including the robust Ocean series for offshore cruising, the sleek Flush hatches for modern yacht aesthetics, versatile Medium Profile hatches for general applications, and the professional-grade Pilot hatches designed for commercial and high-performance vessels.
Each Lewmar hatch in our collection features the company's signature precision-machined components, weatherproof sealing systems, and corrosion-resistant materials that have made them the preferred choice of discerning yacht builders and experienced sailors worldwide. From compact Size 70 configurations perfect for smaller vessels to larger Size 78 installations for spacious cabin areas, our inventory includes both complete hatch assemblies and individual components like lid assemblies for maintenance and upgrades, ensuring you'll find the exact solution for your vessel's ventilation and access requirements.
How to Choose the Right Lewmar Hatches
Understanding Hatch Sizes and Dimensions
Lewmar hatches are available in three primary sizes, each designed for specific applications and vessel requirements. Size 70 hatches feature a cut-out dimension of 62.7 x 62.7 cm (24 11/16" x 24 11/16"), making them ideal for smaller vessels, galleys, or areas where space is limited. These compact hatches provide excellent ventilation while maintaining structural integrity in confined spaces.
Size 77 hatches offer a cut-out of 69.9 x 69.9 cm, providing increased airflow and natural light for medium-sized vessels. The Size 78 hatches feature the largest opening at 72 x 77.0 cm (28 1/4" x 30 1/4"), perfect for main salon areas, master cabins, or vessels requiring maximum ventilation and emergency egress capabilities. When selecting hatch size, consider both the interior space requirements and the deck structural limitations of your vessel.
Hatch Profile Types and Applications
The Ocean Series represents Lewmar's heavy-duty option, engineered for offshore cruising and commercial applications. Available in both flange base and flat base configurations, Ocean hatches feature reinforced construction and enhanced sealing systems. The flange base design provides superior water drainage, while the flat base option offers a lower profile installation suitable for areas with height restrictions.
Medium Profile hatches balance strength with aesthetics, offering a streamlined appearance without compromising functionality. These hatches work well on cruising yachts and performance sailing vessels where both durability and visual appeal matter. The Flush hatches provide the lowest profile option, sitting nearly level with the deck surface for a sleek, modern appearance while maintaining full functionality.
The premium Pilot Series features advanced materials and precision engineering, designed for luxury yachts and high-performance vessels. These hatches incorporate enhanced weatherproofing and smoother operation mechanisms, justifying their higher price point through superior long-term performance and refined aesthetics.
Construction Materials and Durability
Lewmar hatches utilize marine-grade materials specifically chosen for saltwater environments. The frame construction typically features anodized aluminum or marine-grade plastic polymers that resist corrosion and UV degradation. Lens materials include tempered safety glass for maximum clarity and impact resistance, or high-grade acrylic for weight-sensitive applications.
Sealing systems incorporate multiple barriers including primary seals, drainage channels, and secondary weather seals. The hardware components use 316 stainless steel or bronze alloys to prevent galvanic corrosion. When evaluating construction quality, consider the operating environment - vessels in tropical or high-UV conditions benefit from enhanced UV-resistant materials, while cold-weather operations require seals that remain flexible at low temperatures.
Ventilation and Operational Features
Modern Lewmar hatches offer multiple ventilation positions, allowing precise airflow control. Screen integration prevents insects while maintaining ventilation, crucial for extended anchoring in tropical locations. The opening mechanisms vary from simple lift-and-prop systems to sophisticated gas-strut assisted operation, with some models featuring integrated rain sensors for automatic closure.
Consider the primary use case when selecting operational features. Hatches in sleeping areas benefit from silent operation and blackout capabilities, while galley hatches require easy one-handed operation and grease-resistant surfaces. Emergency egress hatches must meet specific opening force requirements and clear opening dimensions as mandated by safety regulations.
Installation Requirements and Compatibility
Proper installation requires adequate deck thickness and structural support around the cut-out perimeter. Deck thickness requirements vary by hatch size and type, with larger units requiring reinforcement or backing plates for proper load distribution. The cut-out dimensions must be precisely measured, as undersized openings prevent proper installation while oversized cuts compromise structural integrity.
Electrical considerations include 12V or 24V power requirements for motorized units, along with control wiring and switch placement. MAURIPRO technical specialists can provide detailed installation drawings and structural requirements for each hatch model, ensuring proper integration with your vessel's existing systems and maintaining warranty compliance through professional installation practices.
Brand Overview
| Brand | Models in Stock | Price Range |
|---|---|---|
| Lewmar | 14 models | $1,160–$2,250 |
Technical Decision Matrix
Compare key specifications across brands and models to find the right fit for your boat and sailing style.
Frequently Asked Questions
What's the difference between Lewmar Ocean, Pilot, Medium Profile, and Flush hatches?
Ocean hatches are Lewmar's heavy-duty offshore series with reinforced construction for extreme conditions. Pilot hatches offer medium-duty performance with excellent ventilation and are popular for cruising boats. Medium Profile hatches provide a lower profile design that reduces wind resistance while maintaining good ventilation. Flush hatches sit nearly flat against the deck when closed, offering the lowest profile but with limited ventilation compared to other models.
How do I determine the correct hatch size - Size 70, 77, or 78?
The size number refers to the cut-out dimensions needed in your deck. Size 70 requires a 62.7 x 62.7 cm cut-out, Size 77 needs 69.9 x 69.9 cm, and Size 78 requires 72 x 77.0 cm. Measure your existing hatch opening or determine the desired opening size based on your ventilation needs and deck space. MAURIPRO carries all three sizes across different Lewmar series to match your boat's requirements.
What's the difference between flange base and flat base Ocean hatches?
Flange base Ocean hatches have a raised perimeter flange that sits on top of the deck surface, providing easier installation and a more watertight seal. Flat base models are designed to be recessed into the deck with the base sitting flush or below deck level. Flange base versions are generally easier to retrofit on existing boats, while flat base models offer a cleaner appearance when properly installed.
Can I buy just a replacement lid assembly for my existing Lewmar hatch?
Yes, MAURIPRO stocks several Lewmar lid assemblies as separate components. We carry the Pilot Hatch Size 78 lid assembly in Grey and the Ocean Hatch Size 77 lid assembly in Smoke finish. There's also a Medium Profile Hatch Size 77 MKII lid assembly available. Make sure to match the exact size and series of your existing hatch base for proper fit and function.
Why do Lewmar hatches of the same size have different prices?
Price differences reflect the hatch series, materials, and features included. Ocean series hatches command higher prices due to their heavy-duty construction and offshore rating. Different finishes like smoke tinting versus clear also affect pricing. Additionally, complete hatch units cost more than lid-only assemblies, and newer MKII versions may be priced differently than standard models due to design improvements.
Shipping & Support
MAURIPRO offers free US shipping on orders over $99, a price-match guarantee on all lewmar hatches, and dedicated rigging experts available by phone or email. Contact our rigging team for personalized product recommendations.
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