Stainless Steel Fixed Chock (Model #CH-460-3-SS)
The Model #CH-460-3-SS is a heavy duty, closed-profile replacement fixed chock engineered to guide primary mooring lines securely through a vessel's bulwarks. Fabricated from premium marine-grade stainless steel with a precision-machined internal radius, this fixed chock acts as a static, low-friction directional boundary that shields synthetic hawsers and wire tow lines from destructive chafing. Its rugged, closed-loop configuration provides an absolute geometric constraint, preventing high-tension mooring lines from accidentally escaping or popping out of alignment during intense multi-angle wave surges and vertical tidal transitions.
Design & Function
This stainless steel fixed chock functions as a primary lines-routing hub along high-exposure bulwarks and weather decks. Positioned between deck winches, single/double bitts, and external dock structures, it directs massive incoming tensile forces safely across its radiused profile. By eliminating sharp deck-edge corners, the cast assembly evenly distributes lateral mooring stress, preventing localized deformation of the hull plating and safeguarding the vessel’s perimeter integrity under heavy surging currents and green water loading.
Intended Use Cases:
- Primary line-routing guides for bulwark or deck configurations on open weather decks.
- High-exposure mooring centers requiring maximum protection against synthetic rope wear.
- Structural refits on utility workboats, crew boats, and ocean-going supply hulls.
- Directional fairlead boundaries for heavy deck winches and auxiliary rigging lines.
Primary Industries & Vessel Types:
- Offshore supply vessels (OSVs), multi-purpose crew boats, and dive support platforms.
- Commercial ocean trawlers, longliners, and processing barges.
- Harbor tugs, coastal push boats, and rapid-response patrol craft.
- Ocean-going cargo vessels, container ships, and private luxury commercial hulls.
Key Features
- Premium Marine-Grade Stainless Steel: Delivers maximum structural yield strength and absolute resistance to deep atmospheric saltwater pitting, crevice corrosion, and rust staining without requiring paint or protective coatings.
- Closed-Loop Line Retention: Establishes an unyielding structural border that locks high-diameter hawser ropes securely within the chock pocket, ensuring optimal safety during severe multi-angle loading.
- Ultra-Smooth Friction Radius: Finely finished inner clearance contours minimize localized friction heat and rope-to-metal abrasion, significantly extending the operational service life of costly synthetic lines.
Installation
- Surface Layout and Prep: Position the #CH-460-3-SS fixed chock precisely on the designated bulwark frame insert or deck doubler plate, grinding the attachment area down to bare white metal to ensure a flawless structural interface.
- Weld Joint Configuration: Chamfer or bevel the mounting lip edges as required by the vessel's engineering prints to prepare the joint for full-penetration structural welding.
- Welding Execution Protocol: Complete a continuous multi-pass structural weld around the entire base flange perimeter using appropriate low-hydrogen stainless steel filler metals or transition alloys matching AWS D1.6 standards.
- NDT Inspection and Cooling: Allow the finished weldment to cool slowly and naturally under an insulating blanket to prevent thermal stress fractures, then perform visual or liquid penetrant NDT testing to verify full structural integrity.
- Post-Weld Passivation: Thoroughly clean away any residual welding spatter or slag, and treat the raw heat-affected zones with a stainless steel passivation compound to restore localized corrosion resistance against saltwater exposure.