The Lewmar Low Profile Hatch is a deck hatch built around an anodized aluminum frame and a grey acrylic window. Smaller sizes work as ventilation hatches in almost any deck location, while larger sizes serve as foredeck hatches on small to mid-size yachts. The lid is grey acrylic—durable and lightweight—while the anodised aluminium lower frame provides excellent corrosion resistance even in harsh marine environments. 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. MAURIPRO Sailing stocks Lewmar low profile hatch options, listed in Lewmar low profile hatches.
Lewmar low profile hatch at a glance
| Product | Brand | What it is for |
|---|---|---|
| Lewmar Low Profile Hatch Size 10 - Cut Out: 26 x 26.0 cm (10 1/4 x 10 1/4 in) - Grey Acrylic / Silver Frame | Lewmar | Featuring a durable grey acrylic and silver frame, this lewmar hatch measures overall 13 x 13 inches (330 x 330 mm). |
| Lewmar Low Profile Hatch Size 30 - Cut Out: 32.7 x 45.7 cm (12 7/8 x 18 in) - Grey Acrylic / Silver Frame | Lewmar | This marine hatch is crafted with grey acrylic and features a silver frame, measuring 15 5/8 x 20 3/4 inches (397 x 527 mm). |
| Lewmar Low Profile Hatch Size 60 - Cut Out: 50.7 x 50.7 cm (19 15/16 x 19 15/16 in) - Grey Acrylic / Silver Frame | Lewmar | The lewmar hatch's size and build make it suitable for both small ventilation needs and as a principal foredeck hatch. |
What does a Lewmar low profile hatch actually do?
Lewmar Low Profile Hatch Size 60 (with Stay) — a larger foredeck-scale hatch supplied with a stay to hold the lid open. It provides ventilation and access from the deck to storage or living space below while sitting only about 25 mm proud of the deck. Its key components are the hinge caps that cover the whole assembly, the hinge pins that join the upper and lower sections, and the black cap (also called the spacer). Start with the handles: the outside handles are smaller than the inside pair and, when the hatch is unlocked, let you open it from on deck.
How do you match a Lewmar low profile hatch to your boat?
The lid opens up to 180 degrees on rectangular and D-Hatch models, and up to 170 degrees on round hatches. The instinct is to order a whole new hatch — but Lewmar sells the parts that actually wear out (the hinge kit, the seal, and the friction lever) as separate, size-matched spares, and none of them require pulling the hatch off the deck. Lewmar Low Profile Hatch Size 22 (MKII) Hinge Kit — a friction hinge service part with the caps, pins and spacer needed to rejoin the lid. This marine hatch is crafted with grey acrylic and features a silver frame, measuring 15 5/8 x 20 3/4 inches (397 x 527 mm). Featuring a durable grey acrylic and silver frame, this lewmar hatch measures overall 13 x 13 inches (330 x 330 mm).
What separates the Lewmar low profile hatch options we stock?
Lewmar Low Profile Hatch Size 10 - Cut Out: 26 x 26.0 cm (10 1/4 x 10 1/4 in) - Grey Acrylic / Silver Frame
It's designed to be mounted on a flat surface with a tolerance of +/- 1mm, ensuring a snug fit. The fasteners needed include M6 / 1/4" for the hinge section and 5mm CSK screw No.10 UNC 2 BA for the lower frame, offering a secure installation.
Lewmar Low Profile Hatch Size 30 - Cut Out: 32.7 x 45.7 cm (12 7/8 x 18 in) - Grey Acrylic / Silver Frame
It's a versatile marine hatch that suits not only powerboats but also smaller to mid-sized yachts. Its mounting requires M6 / 1/4" fasteners at the hinge section and 5mm CSK screw No.10 UNC 2 BA for the lower frame.
Lewmar Low Profile Hatch Size 60 - Cut Out: 50.7 x 50.7 cm (19 15/16 x 19 15/16 in) - Grey Acrylic / Silver Frame
With its robust construction, this lewmar hatch ensures durability and reliability, making it an ideal choice for various marine. Designed for easy installation, it requires fastening at the hinge section with M6 / 1/4" screws and uses 5mm CSK screw No.10 UNC 2 BA for the lower frame. The lewmar hatch's size and build make it suitable for both small ventilation needs and as a principal foredeck hatch.
What build details matter on a Lewmar low profile hatch?
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. When replacing that seal, locate the small air hole — it sits at the handle end of the acrylic, which is the last point the seal closes, so trapped air is pushed out through it rather than getting sealed inside as the hatch shuts. Then inspect the seal for hardening or cracks, confirm the air hole is clear, and check the upper and lower frames — made of anodized aluminum for corrosion resistance — for pitting or damage. Its low, curved profile gives it a modern look while adding structural strength, and the anodized frame resists corrosion in the marine environment.
What else decides the choice?
When the hatch is left unlocked, the outside handles let you open it from the deck as well as from below — except on Sizes 00, 03, 10, 20 and 41, which have no outside handle and open only from inside. The friction hinge kit is what holds the upper and lower parts of the hatch together, allowing the lid to pivot open and closed. 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. Working alongside the hinge, the friction leveler keeps the hatch held open at an angle so it does not slam shut.
Which should you choose?
- Lewmar Low Profile Hatch Size 10 - Cut Out: 26 x 26.0 cm (10 1/4 x 10 1/4 in) - Grey Acrylic / Silver Frame — It's designed to be mounted on a flat surface with a tolerance of +/- 1mm, ensuring a snug fit.
- Lewmar Low Profile Hatch Size 30 - Cut Out: 32.7 x 45.7 cm (12 7/8 x 18 in) - Grey Acrylic / Silver Frame — It's a versatile marine hatch that suits not only powerboats but also smaller to mid-sized yachts.
- Lewmar Low Profile Hatch Size 60 - Cut Out: 50.7 x 50.7 cm (19 15/16 x 19 15/16 in) - Grey Acrylic / Silver Frame — The lewmar hatch's size and build make it suitable for both small ventilation needs and as a principal foredeck hatch.
Frequently asked questions
What should you check first when buying a Lewmar low profile hatch?
Start with the deck cut-out: measure the existing opening (or the space available) and match it to a listed cut-out size — the three sizes stocked here range from a 26 x 26 cm cut-out up to 50.7 x 50.7 cm. Then confirm the mounting surface is flat to within +/- 1mm, and check whether your size includes an outside handle, since Sizes 00, 03, 10, 20 and 41 do not.
What size Lewmar low profile hatch fits your boat?
Match the size to the cut-out you already have (or can cut): Size 10 needs a 26 x 26 cm opening, Size 30 needs 32.7 x 45.7 cm, and Size 60 needs 50.7 x 50.7 cm. Smaller sizes work well for ventilation anywhere on deck, while the larger sizes can double as a foredeck hatch.
What is a Lewmar low profile hatch made of?
Lewmar Low Profile Hatch Size 60 — a large deck hatch pairing a grey acrylic lid with the anodized-aluminum upper and lower frames that give the range its 25 mm low profile and corrosion resistance.
How is a Lewmar low profile hatch mounted or set up?
It mounts to a flat deck surface with a tolerance of +/- 1mm. Use M6 / 1/4" fasteners at the hinge section, and a 5mm CSK screw No.10 UNC 2 BA for the lower frame.
What load can a Lewmar low profile hatch take?
The acrylic is the heart of the hatch: it is strong enough to support a sailor's weight, and Lewmar offers it in grey (a smoke tint) or green.
Where can you buy a Lewmar low profile hatch?
MAURIPRO Sailing stocks the Lewmar low profile hatch options shown above, with the full selection in Lewmar low profile hatches.
Shop Lewmar low profile hatches →
Shop Lewmar sailboat marine ventilation hatches →
Last updated: September 22, 2026.
Shop all Lewmar Hatches - Spares →