NorDav 316L Stainless Steel Backing Plate Deck Reinforcement Kit

Description

Premium High-Strength 4-Pack Electro-Polished 316L Stainless Steel Reinforcement Kit for NorDav Swivel Mounts

The NorDav 316L Stainless Steel Backing Plate Deck Reinforcement Kit provides a professional structural solution for boat builders, luxury yacht owners and watercraft operators dealing with standard fiberglass layouts. Modern composite swim platforms offer excellent structural properties, but they can flex significantly under intense point-load spikes when winching up heavy tenders or personal watercraft. This heavy-duty structural backing kit solves this architectural bottleneck completely, transferring high shear stresses across an expanded 50x4mm surface plane. **Supplied as a comprehensive 4-piece kit**, it provides matching support for all four core anchoring bolts, ensuring your rotating bunk base plates sit flat throughout full loading arcs and shifting load boundaries cleanly away from primary cockpit structures.

Advanced System Synergy & Platform Versatility

Engineered for maximum utility across our entire watercraft handling architecture, this heavy-gauge steel backing kit functions flawlessly across all configuration layouts. Whether your vessel utilizes the vertical-profile NorDav V-Series Lift to minimize upper deck footprints or the low-slung NorDav H-Series Swivel Bunks for deep platform integration, these anchoring plates serve as a perfect mechanical anchor. The precision-milled M8 bolt slots align perfectly under your existing quick-release base plates, surface plates, or permanent mounts, interlocking into a rock-solid, sway-free unit that dampens engine harmonic vibration and rough-sea structural torque tracking with absolute ease.

Aerospace-Grade Rigidity & Advanced Electro-Polished Finish

Constructed entirely from premium, heavy-gauge 316L marine-grade stainless steel, this high-leverage structural kit possesses immense mechanical load and shear tolerances. The advanced electro-polished surface treatment removes surface impurities at a microscopic level, creating an ultra-smooth chromium oxide barrier that resists relentless saltwater pooling and harsh bilge moisture tracking. The tight engineering dimensions allow your main mounting bolt arrays to torque down firmly, offering long-term deck safety parameters that remain entirely safe, fast and stress-free.

🔧 Official 316L Backing Plate Structural Installation Guide

Follow these verified shipwright steps to ensure a completely safe, watertight, and load-stabilized deck anchoring profile using your 4-piece kit:

1. Underside Clearspace Assessment: Access the interior hatch beneath your swim platform deck. Position the four (4) provided reinforcement plates over your pre-drilled M8 pilot hole locations to verify they clear structural fiberglass stringers, water pumps, fuel line runs and wiring looms.
2. Surface Prep and De-Coring: Ensure the interior deck surface is completely flat, sanded free of raw fiberglass hairs and wiped down with a wax solvent cleaner. (Pro-Tip: If you are mounting onto a foam or balsa cored deck structure, hollow out 10mm of core material inside the mounting path and backfill with solid structural epoxy paste to protect the core from localized crushing torque).
3. Watertight Sealant Integration: Apply a generous bead of high-performance marine polyurethane structural adhesive sealant (such as Sikaflex 291 or 3M 5200) to the upward-facing surface of all four backing plates and directly inside the drilled M8 bolt paths to establish an absolute hermetic seal against water tracking.
4. Fastener Counter-Anchoring: Pass your heavy-duty M8 stainless steel bolts down through your top surface mounts and the deck substrate. From the underside, push the four cored backing plates onto the bolts and screw down tightly using marine washers and standard nylon-locking structural aircraft nuts.
5. Torque Operational Check: Using cross-pattern sequences, torque all four nuts evenly to engineering specifications. Once secure, manually check your top davit system swivel base frames, verifying there is zero lateral play, shifting, or platform compression when rocking the cradle assembly arms.

📊 Technical & Operational Specifications

Review the mechanical boundaries and structural properties for this premium deck reinforcement system: