Cast Steel 8" Button Chock (Model #ICF-473)
The Model #ICF-473 is a heavy duty 8" cast steel button chock engineered to provide exceptional line control and smooth directional routing along commercial vessel decks and bulwarks. Fabricated from premium marine-grade structural cast steel, this single-button mooring chock features a distinct vertical post node that allows crew members to rapidly wrap, pivot, or change the direction of mooring lines without having to thread long hawsers from the end. Its thick, heavy-duty base is optimized to distribute intense localized line friction and high multi-angle shear loads evenly into the vessel's primary deck stringers and internal hull framing.
Design & Function
This 8" button chock functions as a primary lines-handling fixture on commercial workboat flats and cargo transport barges. By turning mooring lines or spring lines around the 8-inch vertical cast steel column, crew members can safely redirect or check lines to optimize line angles between winches and dock bitts. The heavy wall thickness of the casting ensures that intense rope abrasion will not score, gouge, or structurally weaken the core over long ocean-going lifecycles, maintaining dependable docking security under extreme tidal changes and rushing currents.
Intended Use Cases:
- Primary line-routing guides for deck configurations on high-traffic work decks.
- Localized line turning points for working rigging and auxiliary winch lines.
- Mooring line management on inland and offshore commercial cargo barges.
- Main deck refits on existing utility hulls requiring commercial-grade button chocks.
Primary Industries & Vessel Types:
- Inland river pushers, commercial harbor tugs, and offshore supply vessels (OSVs).
- Flat-deck cargo barges, hopper barges, and liquid chemical transport vessels.
- Commercial ocean trawlers, purse seiner fishing vessels, and longliners.
- Marine infrastructure equipment, dredges, floating cranes, and spud barges.
Key Features
- Premium Cast Steel Construction: Offers superior structural yield strength and high ductility compared to cast irons, preventing catastrophic fracture risks under sudden line shock loads.
- Integrated Button Turning Node: Smooth vertical column profile allows for fast line securement and dynamic turning angles on high-traffic cargo or work decks.
- Heavy Weld-Down Base Foundation: Generous mounting footprint optimized for full-penetration welding directly into steel deck structures or bulwark caps.
Installation
- Deck Prep & Alignment: Position the #ICF-473 button chock on the deck plate exactly above the underlying structural framing or gusset plates specified by the naval architect, ensuring the footprint area is ground down to clean white metal.
- Under-Deck Reinforcement Check: Verify that the deck thickness beneath the cast steel base satisfies the required structural class rules, adding insert doubler plates or carling angles to the under-deck framing if necessary to prevent deck flexing.
- Welding Execution & Pre-Heat: Pre-heat the cast steel base and steel deck plate to recommended shipyard temperatures matching the specific steel grade metallurgy, then execute a continuous multi-pass structural fillet weld around the entire flange perimeter using low-hydrogen electrodes (AWS D1.1 standard).
- Post-Weld Cooling & Inspection: Allow the completed weldment to cool slowly and naturally under an insulating blanket to prevent thermal stress fractures, then perform visual or magnetic particle NDT inspection to verify full weld integrity.
- Corrosion Protection Sealing: Thoroughly wire-brush any residual weld slag away, and immediately apply a high-solids marine primer or epoxy topcoat over the raw weld seams to seal out moisture and guard against atmospheric rust.