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DF-473C
HEE
DF-473C CAST STEEL 8" BUTTON CHOCK
| MODEL NO. | ΦA | ΦB | ΦC | D | E | F | G | WT.(lbs) |
| DF-473C | 13" | 8 5/8" | 12 1/2" | 5/8" | 3 3/4" | 5 3/4" | 3/4" | 75 |
The DF-473C Cast Steel 8-Button Chock stands as a critical mooring component in marine operations, providing secure rope guidance and termination for vessels of all sizes. As global maritime trade continues to expand—with the mooring equipment market projected to grow alongside commercial shipping—this chock delivers exceptional strength and durability for demanding port operations . Manufactured according to ISO 13713 standards, the DF-473C features an 8-button configuration that optimizes rope contact while minimizing friction and wear. With a safe working load (SWL) of 981 kN (100 tons) and weight of 280 kg, it is engineered for heavy-duty applications on bulk carriers, container ships, and offshore platforms.
Fabricated from ASTM A27 grade cast steel, the chock undergoes rigorous non-destructive testing to ensure absence of internal defects that could compromise strength . The one-piece casting eliminates welds that create potential failure points, while the heat-treated surface achieves a minimum hardness of 180 BHN for wear resistance. All surfaces in contact with mooring lines are smoothly finished to reduce rope abrasion.
The 8-button design creates multiple contact points that distribute load evenly across the rope surface, reducing localized stress and extending rope service life . The curved button surfaces feature a 12:1 bend ratio optimized for synthetic mooring lines, minimizing rope strength loss during mooring operations. This geometry accommodates rope diameters from 60mm to 90mm while maintaining optimal contact.
The chock receives a multi-step protective coating system including sandblasting to SA 2.5 standards, zinc-rich primer, and marine-grade polyurethane topcoat . All exposed surfaces are covered with this system, providing 1,500+ hours of salt spray resistance per ASTM B117 testing. Drainage holes prevent water accumulation in recessed areas, further enhancing corrosion resistance.
ISO 13713 establishes international standards for design, materials, testing, and performance of mooring chocks, ensuring compatibility and safety across global maritime operations . Certification confirms the DF-473C meets rigorous requirements for strength, durability, and rope compatibility.
The 8-button design provides more contact points than 4-button models, distributing load more evenly across the rope surface to reduce wear and extend rope life . This configuration offers better rope control than larger single-button designs while maintaining sufficient rope clearance for operation with synthetic lines.
The DF-473C is optimized for synthetic mooring lines with diameters ranging from 60mm to 90mm (2.36 to 3.54 inches). This range covers the most common sizes used on Panamax container ships, bulk carriers, and offshore support vessels.
The chock requires welded installation to the vessel’s structural members (bulkhead or deck) with continuous fillet welds meeting AWS D1.1 standards . Proper alignment with mooring winches is critical, with the chock centerline aligned within 5° of the rope pull direction to prevent side loading and premature wear.
The chock should be inspected monthly for rope wear patterns, corrosion, and loose fasteners . The rope contact surfaces should be cleaned regularly to remove debris that could abrade ropes. Touch-up paint should be applied to any damaged areas to maintain corrosion protection. Annual load testing is recommended for chocks in critical applications.
DF-473C CAST STEEL 8" BUTTON CHOCK
| MODEL NO. | ΦA | ΦB | ΦC | D | E | F | G | WT.(lbs) |
| DF-473C | 13" | 8 5/8" | 12 1/2" | 5/8" | 3 3/4" | 5 3/4" | 3/4" | 75 |
The DF-473C Cast Steel 8-Button Chock stands as a critical mooring component in marine operations, providing secure rope guidance and termination for vessels of all sizes. As global maritime trade continues to expand—with the mooring equipment market projected to grow alongside commercial shipping—this chock delivers exceptional strength and durability for demanding port operations . Manufactured according to ISO 13713 standards, the DF-473C features an 8-button configuration that optimizes rope contact while minimizing friction and wear. With a safe working load (SWL) of 981 kN (100 tons) and weight of 280 kg, it is engineered for heavy-duty applications on bulk carriers, container ships, and offshore platforms.
Fabricated from ASTM A27 grade cast steel, the chock undergoes rigorous non-destructive testing to ensure absence of internal defects that could compromise strength . The one-piece casting eliminates welds that create potential failure points, while the heat-treated surface achieves a minimum hardness of 180 BHN for wear resistance. All surfaces in contact with mooring lines are smoothly finished to reduce rope abrasion.
The 8-button design creates multiple contact points that distribute load evenly across the rope surface, reducing localized stress and extending rope service life . The curved button surfaces feature a 12:1 bend ratio optimized for synthetic mooring lines, minimizing rope strength loss during mooring operations. This geometry accommodates rope diameters from 60mm to 90mm while maintaining optimal contact.
The chock receives a multi-step protective coating system including sandblasting to SA 2.5 standards, zinc-rich primer, and marine-grade polyurethane topcoat . All exposed surfaces are covered with this system, providing 1,500+ hours of salt spray resistance per ASTM B117 testing. Drainage holes prevent water accumulation in recessed areas, further enhancing corrosion resistance.
ISO 13713 establishes international standards for design, materials, testing, and performance of mooring chocks, ensuring compatibility and safety across global maritime operations . Certification confirms the DF-473C meets rigorous requirements for strength, durability, and rope compatibility.
The 8-button design provides more contact points than 4-button models, distributing load more evenly across the rope surface to reduce wear and extend rope life . This configuration offers better rope control than larger single-button designs while maintaining sufficient rope clearance for operation with synthetic lines.
The DF-473C is optimized for synthetic mooring lines with diameters ranging from 60mm to 90mm (2.36 to 3.54 inches). This range covers the most common sizes used on Panamax container ships, bulk carriers, and offshore support vessels.
The chock requires welded installation to the vessel’s structural members (bulkhead or deck) with continuous fillet welds meeting AWS D1.1 standards . Proper alignment with mooring winches is critical, with the chock centerline aligned within 5° of the rope pull direction to prevent side loading and premature wear.
The chock should be inspected monthly for rope wear patterns, corrosion, and loose fasteners . The rope contact surfaces should be cleaned regularly to remove debris that could abrade ropes. Touch-up paint should be applied to any damaged areas to maintain corrosion protection. Annual load testing is recommended for chocks in critical applications.
