Side Mount Deck Hinges
What Are Side Mount Deck Hinges?
Side mount deck hinges are a critical piece of hardware in any bimini top or boat cover system. These fittings serve as the primary mounting point that anchors the main bow of your bimini top directly to the boat's gunnel or deck surface. Unlike standard flat-mount deck hinges that sit flush on a horizontal surface, side mount versions are specifically designed to attach to the vertical or angled sides of a gunnel — making them indispensable on boats where a traditional flat-deck mount simply isn't possible.
Side mount deck hinges typically feature a swivel or pivot design that allows the bimini frame to fold down for storage or travel and lock into position when shade is needed. Most quality hinges include a removable or spring-loaded pin so the bimini bow can be quickly inserted or released without tools — a convenience that serious boaters appreciate on the water.
Why Material Choice Matters
Because these fittings live in one of the harshest environments on earth — constant exposure to UV rays, saltwater spray, and temperature swings — material selection is paramount. Marine-grade side mount deck hinges are most commonly available in two materials:
- 316 Stainless Steel: The gold standard for saltwater environments. Grade 316 stainless offers superior corrosion resistance over 304 stainless, thanks to its molybdenum content, making it ideal for offshore or coastal use.
- Marine-Grade Nylon/Polymer: A lightweight, cost-effective alternative that resists UV degradation and corrosion. Best suited for freshwater or protected marine environments.
Deck hinges take on a great deal of strain — especially in rough conditions — so selecting the right material and ensuring a secure, properly caulked installation is essential for long-term performance.
Key Considerations When Shopping
Before purchasing a side mount deck hinge, there are several factors to evaluate. First, confirm the tubing diameter of your bimini frame — common sizes include 7/8" and 1" tubing — as the hinge eye must match the frame's outer diameter. Second, measure the available mounting surface on the side of your gunnel to ensure the hinge base will seat flush and allow for proper screw placement. Finally, consider whether you want a fixed pin for a permanent installation or a removable/quick-release pin for frequent folding and stowing of the top.
Angle shims are also worth considering if your gunnel surface is not perfectly vertical, as they allow the hinge to sit flat and distribute load evenly — reducing stress on both the fitting and the fiberglass.
Top Brands in Side Mount Deck Hinges
When it comes to reliable, marine-grade deck hardware, Sea-Dog Line stands out as one of the most trusted names in the industry. Sea-Dog Line has been supplying quality marine hardware since the early 1900s, with a broad catalog that spans deck hardware, rigging components, lighting, and more. Their side mount deck hinges are built from marine-grade materials — including 304 and 316 stainless steel and UV-resistant polymers — engineered to hold up in both freshwater and saltwater conditions. With a legacy spanning generations and recognition from the National Marine Distributors Association, Sea-Dog Line is a go-to source for boaters who demand dependable hardware.