Lewmar Size 50 Ocean Series Hatch Flange Base
Lewmar Size 50 Ocean Series Hatch Flange Base — Product description
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:
| Lower Frame | Acrylic Colour | Hatch Weight (lb) | Acrylic Window Thickness (in) |
|---|---|---|---|
| 1" Flange | Smoke Grey | 16.1 | 1/2 |
| Length X (in) | Width Y (in) | Height Z (in) | Radii R (in) | Hinge Length HX (in) |
|---|---|---|---|---|
| 17 1/2 | 22 5/8 | 1 11/16 | 3 | 3/16 |
| Hinge Width HY (in) | Cut-Out Length Flat X1 (in) | Cut-Out Width Flat Y1 (in) | Cut-Out Radii Flat R1 (in) |
|---|---|---|---|
| 14 7/16 | 14 13/16 | 19 15/16 | 1 11/16 |
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.
Frequently Asked Questions
What surface preparation is needed for installing the Lewmar Size 50 Ocean Hatch Flange Base?
Ensure the deck is flat within +/- 1mm tolerance. Sand any high spots smooth and apply a primer if bonding to fiberglass for optimal adhesion.
What fasteners should I use for the hinge and frame sections?
Use M6 or 1/4-inch bolts for the hinge area, and 5mm countersunk screws (No.10 UNC or 2 BA) for the lower frame. Always choose stainless steel for corrosion resistance.
Is the smoke grey acrylic suitable for direct sunlight exposure?
Yes, the smoke grey tint provides excellent UV protection, reducing fading and interior heat buildup while maintaining clear visibility.
How much does the complete Size 50 hatch weigh with this flange base?
The assembly weighs approximately 16.1 lbs, making it manageable for installation on larger vessels without heavy lifting gear.
Can this flange base be used as a replacement for older Lewmar hatches?
Absolutely—its standard dimensions match legacy Ocean Series models, simplifying retrofits on classic boats.
What cut-out size do I need for the deck?
Prepare a cut-out of 14 13/16 inches long by 19 15/16 inches wide, with 1 11/16-inch flat radii for a precise fit.
How does the 1-inch flange improve hatch performance?
The extended flange creates a wider sealing surface, enhancing water shedding and structural support against wave impacts.
- Fit to a flat surface with a maximum tolerance of +/- 1mm.
- Fastening size at hinge section use (M6 / 1/4").
- Fastening size for lower frame use 5mm CSK screw No.10 UNC 2 BA.
| Lower Frame (in) | Acrylic Colour | Hatch Weight (lb) | Acrylic Window Thickness (in) |
| 1" Flange | Smoke Grey | 16.1 | 1/2 |
Dimensions
| Length X (in) | Width Y (in) | Height Z (in) | Radii R (in) | Hinge Length HX (in) | Hinge Width HY (in) | Cut-Out Length Flat X1 (in) | Cut-Out Width Flat Y1 (in) | Cut-Out Radii Flat R1 (in) |
| 17 1/2 | 22 5/8 | 1 11/16 | 3 | 3/16 | 14 7/16 | 14 13/16 | 19 15/16 | 1 11/16 |
SKU: NVN-1002625
MPN: 39650070
UPC: 743683113055
Technical specifications
| Brand | Lewmar |
| Model | Lewmar Size 50 Ocean Series Hatch Flange Base |
| SKU / MFR# | 1002625 |
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Frequently asked questions
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