Understanding how these pieces fit together makes it far easier to service a hatch or order the correct replacement part instead of a whole new unit. Almost every mono- and multi-hull sailboat carries hatches, and the Lewmar Low Profile is one of the most common designs on cruising and racing boats. MAURIPRO stocks Lewmar hatches including Low Profile (25 mm lids), Medium Profile (32 mm lids), and the classic Ocean Hatch (9.53 mm acrylic) — and the right one depends on where it sits and how much strength you need. Low and Medium Profile hatches give you smooth, snag-free styling for ventilation and foredeck use, while the rugged Ocean Hatch is built for offshore boats that take heavy weather.
Hatche Replacement Lewmar at a glance
| Product | Brand | Type |
|---|---|---|
| Lewmar Standard Port (New) Catch Block (screws to outer frame) x2 - Alloy | Lewmar | Block |
| Lewmar End Cover (Black) - Size 1 - Beam Track (Pair) | Lewmar | Sailboat Hardware |
| Lewmar Pro-Fish Stopper Kit | Lewmar | Anchoring & Docking |
| Lewmar Pro Series & V700 Clutch Lever Kit | Lewmar | Rope Clutch |
| Lewmar Winch Service Kit - Race Lube 55ml | Lewmar | Winch |
| Lewmar Eclipse Portlight Roller Shade Trim Kit Size 10 | Lewmar | Ventilation |
What defines a Lewmar hatch type?
The three primary Lewmar hatches look similar at a glance but differ in frame depth and lid or acrylic thickness. Lewmar builds three main sailboat deck hatch families — Low Profile (25 mm lids), Medium Profile (32 mm lids), and the classic Ocean Hatch (9.53 mm acrylic) — and the right one depends on where it sits and how much strength you need. Low and Medium Profile hatches give you smooth, snag-free styling for ventilation and foredeck use, while the rugged Ocean Hatch is built for offshore boats that take heavy weather.
How are Lewmar Low Profile Hatches composed?
A Lewmar Low Profile hatch is built from seven main parts: the acrylic lid, a rubber seal, inside and outside handles, a friction hinge kit, joining inserts and screws, upper and lower anodized-aluminum frames, and a friction leveler. Understanding how these pieces fit together makes it far easier to service a hatch or order the correct replacement part instead of a whole new unit.
What are the Low Profile hatch size options?
Lewmar Low Profile Hatch Size 10 — a compact grey-acrylic hatch with a silver anodized frame, sized for a 26 x 26 cm cut-out. Lewmar Low Profile Hatch Size 60 — a large deck hatch showing the anodized-aluminum frame that gives the range its 22 mm low profile. The Low Profile Hatch is designed with smooth, soft styling that is less likely to snag lines or feet, making it practical across many deck locations — smaller sizes for ventilation and larger sizes as foredeck hatches on medium sailboats.
How do Medium Profile hatches differ?
Lewmar Low Profile Hatch Size 40, Lid Assembly (MKII) — a replacement 25 mm lid for the smooth, snag-free Low Profile range. Lewmar Medium Profile Hatch Size 60, Seal Kit — part of Lewmar's sealing system that makes acrylic replacement straightforward. It also uses Lewmar's unique sealing system for easier acrylic replacement. What is the difference between Low Profile and Medium Profile hatches?
When should I choose an Ocean Hatch?
Lewmar Ocean Hatches are the go-to deck hatch for cruising sailors because their rugged, high-profile design delivers the strongest weather protection and best offshore ventilation of any standard Lewmar hatch. The Ocean Hatch is Lewmar's classic-style deck hatch and one of the most widely fitted hatches on cruising boats worldwide. When should I choose a Lewmar Ocean Hatch?
What sizing ranges are available?
Sizes run from 00, ideal for ventilation, up to size 70 for foredeck hatches on large yachts. Lewmar Ocean Hatch Size 60, Lid Assembly (Smoke) — the 9.53 mm acrylic lid built for rugged offshore service.
What is the Ultra Low Profile hatch?
The Lewmar Ultra Low Profile hatch is a flush, low-profile deck hatch that sits just 10 mm above the deck and retrofits directly into existing Lewmar Low Profile, Medium Profile and Ocean hatch cut-outs. The Ultra Low Profile hatch is designed as a seamless retrofit: the cut-outs match Low Profile, Medium Profile and Ocean Hatch installations without modification, and it is compatible with existing Lewmar trims and flyscreens. The Ultra Low Profile hatch builds on Lewmar's proven Low Profile design, with flush, clean lines that minimise impact on the deck.
Which should you choose?
Choose a Lewmar Flush Hatch when you want a low-profile hatch that sits nearly level with the deck for a clean, snag-free working surface, which many owners prefer forward of the mast or on modern deck layouts. The three primary Lewmar hatches look similar at a glance but differ in frame depth and lid or acrylic thickness. Both are quality Lewmar hatches, but they solve different problems.
Frequently asked questions
How do I measure my existing hatch opening?
A Lewmar Low Profile hatch is built from seven main parts: the acrylic lid, a rubber seal, inside and outside handles, a friction hinge kit, joining inserts and screws, upper and lower anodized-aluminum frames, and a friction leveler.
Which hatch is best for offshore cruising?
Lewmar Ocean Hatches are the go-to deck hatch for cruising sailors because their rugged, high-profile design delivers the strongest weather protection and best offshore ventilation of any standard Lewmar hatch.
Can I retrofit an Ultra Low Profile into my current setup?
The Lewmar Ultra Low Profile hatch is a flush, low-profile deck hatch that sits just 10 mm above the deck and retrofits directly into existing Lewmar Low Profile, Medium Profile and Ocean hatch cut-outs.
What are the main differences between Lewmar hatch families?
The three primary Lewmar hatches look similar at a glance but differ in frame depth and lid or acrylic thickness.
Which sizes should I look for?
Sizes run from 00, ideal for ventilation, up to size 70 for foredeck hatches on large yachts.
How does the Lewmar sealing system work?
Lewmar Medium Profile Hatch Size 60, Seal Kit — part of Lewmar's sealing system that makes acrylic replacement straightforward. It also uses Lewmar's unique sealing system for easier acrylic replacement.
Shop Lewmar Hatches and Parts
Shop your Lewmar Spare Parts at Mauri Pro Sailing Store, where we think about what makes boaters lives easier, and bring those ideas to life in our products. That' why each Lewmar Sailing Hardware product we bring to the market is chosen by its finest quality materials and engineered for excellence.
Shop all Lewmar Hatch Families →
Last updated: October 06, 2026.