Discover the Durability of the Lewmar Size 50 Ocean Series Hatch Flange Base

Engineered for the demanding marine environment, the Lewmar Size 50 Ocean Series Hatch Flange Base stands out as a robust foundation for your deck openings. This component, crafted from high-grade anodized aluminum, ensures a seamless fit on vessels where reliability meets the relentless forces of wind, salt spray, and waves. Ideal for larger yachts and sailboats, it provides the structural integrity needed for safe, watertight hatches that enhance onboard ventilation and natural lighting without compromising deck strength.

What sets this flange base apart is its precision design, allowing installation on surfaces with a flatness tolerance of just +/- 1mm. This minimizes leaks and maximizes longevity, making it a go-to choice for boat owners upgrading or repairing their deck hardware. Paired with its smoke grey acrylic lid, it offers subtle UV protection while maintaining visibility below decks.

Key Features and Marine-Grade Construction

• Precision Mounting: Designed for flat deck surfaces with a tight +/- 1mm tolerance, ensuring a secure, gap-free seal that withstands pounding seas.
• Versatile Fastening Options: Hinge section accommodates M6 or 1/4" fasteners, while the lower frame uses 5mm countersunk screws (No.10 UNC or 2 BA) for discreet, rock-solid attachment.
• Smoke Grey Acrylic: Tinted for reduced glare and enhanced UV resistance, with a sturdy 1/2-inch thickness that resists cracking under thermal expansion.
• Lightweight Yet Tough: At just 16.1 lbs, it balances ease of handling during install with the heft needed for Size 50 applications on bigger boats.
• 1-Inch Flange Design: Provides ample overlap for superior sealing against water ingress, perfect for ocean-going adventures.

Detailed Specifications at a Glance

Every dimension is meticulously crafted for compatibility with standard Lewmar Ocean hatch lids and frames. Here's a breakdown:

Effortless Installation Tips for Boatyard Pros and DIY Enthusiasts

Installing this flange base transforms routine maintenance into a straightforward task. Start by marking your cut-out using the precise X1, Y1, and R1 dimensions—template recommended for flawless edges. Secure the base with marine-grade sealant under the flange, then torque down the countersunk screws evenly. For the hinge, opt for stainless M6 bolts to combat corrosion. Pro tip: Dry-fit everything first to account for any deck camber, ensuring that +/-1mm tolerance shines through for a drip-proof result.

Boatbuilders appreciate how this base integrates seamlessly with Lewmar's quick-action friction hinges, allowing smooth operation even in rough conditions. Regular checks on fastener torque keep it performing season after season.

Why Boat Owners Trust Lewmar Ocean Series for Long-Term Performance

In the world of marine hatches, Lewmar's Ocean Series has earned its stripes through decades of real-world testing on everything from coastal cruisers to bluewater racers. The Size 50 flange base excels in high-traffic areas like foredecks or engine room vents, where ventilation demands are high and exposure to elements is constant. Its anodized finish repels saltwater etching, while the generous flange distributes loads to prevent gelcoat stress cracks over time.

Owners report fewer replacements compared to generic alternatives, thanks to thoughtful engineering like rounded radii that shed water efficiently and reinforced corners that shrug off accidental impacts from dock lines or crew traffic.

Maintenance Made Simple for Peak Condition

• Rinse with fresh water after every sail to flush away salt buildup.
• Inspect seals and fasteners annually; lubricate hinges with marine grease.
• Avoid abrasive cleaners—mild soap suffices for the aluminum frame.
• Check acrylic for scratches; polish gently to restore clarity.

With proper care, this hatch base delivers years of trouble-free service, keeping your interior dry and airy.