Flush Square Inox Hatch Lock AISI316 – 51 mm (Premium Marine Latch with Key)

This flush-mounted square hatch lock (51 mm side length) represents a top-tier piece of marine hardware, combining functionality and style. It is designed to install seamlessly into a door or hatch lid so that the top surface of the lock sits completely flush with the surrounding material. This means there are no protruding parts: nothing to snag sails, ropes, or feet when moving about on deck. Moreover, the flush design gives your boat or yacht a modern, streamlined appearance. The 51 mm square plate has a smooth, polished finish – it looks elegant and matches the other stainless steel fittings on board.

Made of high-quality AISI316 stainless steel, this lock withstands saltwater and harsh weather conditions without issue. It will not rust or corrode, maintaining both its function and appearance over years of use. The internal locking mechanism is also constructed from corrosion-resistant alloys, ensuring that locking and unlocking remain smooth and reliable regardless of humidity or salt exposure. The lock operates with an included set of keys (typically 2 are provided). The mechanism is spring-loaded – upon unlocking, the handle or knob pops up slightly, serving as a grip to pull the hatch open. When closed, the handle recesses flush into the latch, remaining level with the surface.

Installation is straightforward: the lock comes with a rubber gasket that fits between the lock and the hatch surface to prevent water ingress. Stainless steel mounting screws are also included. The installation requires a square cut-out of about 54–55 mm (as per specifications) and a few small pilot holes for the screws. Once set in place and the screws tightened, the lock is firmly secured and creates a water-resistant seal. It is adaptable to various panel thicknesses – typically, the set includes adjustable components or a long locking cam that can be tightened to accommodate the door/hatch thickness, ensuring a snug fit.

• Applications: This flush lock is an excellent choice for the main cabin entry (companionway hatch), for cockpit or salon cabinets, and for deck hatches where you want a secure lock. The square design is often favored on modern yachts and boats for its aesthetics and convenience – for example, many anchor locker lids or battery compartment covers use this style of latch. The 51 mm size is a common standard matching many high-end manufacturers’ latches, which makes it easy to replace or upgrade older hardware with this unit. Whether you’re outfitting a new vessel or refitting an older one, this lock adds a touch of elegance and security.
• Advantages: Beyond its sleek look, a flush lock enhances safety – there’s no risk of tripping or catching clothing on it, which is particularly important in tight quarters. The keyed lock provides peace of mind that valuable items or critical compartments are protected (for example, your navigation instruments or tools in lockers). The water-resistant installation prevents rain or spray from leaking through the latch opening, keeping the interior of your compartments dry. This is crucial for lockers that hold electronics or dry stores. Additionally, the mechanism’s smooth action means you can easily open and secure hatches even with one hand.
• Maintenance: Since all components are stainless, maintenance is minimal – simply rinse with fresh water if salt crystals or grime accumulate. If the mechanism ever feels less smooth over time, apply a small amount of lock lubricant into the keyhole to restore easy turning. It’s a good practice to periodically operate the lock (lock and unlock it a few times) to keep the internal parts moving freely, especially if the boat is in storage. When winterizing, you might leave the lock in the unlocked position to relieve pressure on the gasket. With basic care, this flush square lock will remain a reliable and attractive part of your boat for many seasons, ensuring secure closure and enhanced style for your vessel’s hatches and doors.