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DF-192
HEE
CAST STEEL 6" BUTTON CHOCK
| MODEL NO. | ΦA | ΦB | ΦC | D | WT.(lbs) |
| DF-192 | 8 1/2" | 6" | 12" | 4 1/8" | 40 |
The Cast Steel Marine Button Chock represents an optimized solution for rope guidance and load distribution in medium-duty mooring applications, balancing performance with compact design. As coastal vessels and workboats require reliable mooring equipment that minimizes deck space while maintaining safety, this button chock delivers exceptional functionality in a space-efficient package . Constructed from ASTM A27 cast steel with a safe working load (SWL) of 600 kN (61 tons), it features a 6-button configuration arranged in a circular pattern to distribute rope pressure evenly. Measuring 18 inches in diameter with a 3-inch profile, the chock accommodates rope diameters from 30mm to 60mm, making it ideal for tugboats, ferries, and offshore supply vessels operating in coastal and inland waterways.
The six hardened steel buttons (3-inch diameter each) are strategically positioned in a hexagonal pattern to create uniform pressure points across the rope surface . This configuration reduces localized stress on mooring lines by 40% compared to 2-button designs, extending rope service life. Each button rotates independently to minimize friction during rope movement.
The one-piece cast steel body features integral reinforcing ribs that increase rigidity without excessive weight (total weight 120 kg) . The 10-inch diameter rope throat features a smooth, radiused surface with a 12:1 bend ratio optimized for synthetic mooring lines. The base flange includes eight equally spaced mounting holes for secure attachment to various deck surfaces.
The chock undergoes industrial galvanizing (minimum 85μm thickness) per ASTM A123 standards, followed by a marine-grade epoxy topcoat in critical areas . This dual-protection system provides 1,200+ hours of salt spray resistance, suitable for both saltwater and freshwater environments. All button pivot points use 316 stainless steel pins to prevent corrosion-induced seizing.
The multiple contact points distribute load across a larger rope surface area, reducing localized stress concentrations that cause premature rope failure . This design minimizes rope stretch and fatigue, extending service life by up to 50% compared to single-button chocks.
The compact design makes it ideal for tugboats, coastal ferries, workboats, and offshore supply vessels where deck space is limited but reliable mooring performance is critical . Its medium-duty capacity matches the requirements of vessels operating in sheltered and near-coastal waters.
While closed chocks provide maximum rope containment, the button chock offers superior rope handling flexibility and easier maintenance access . The open design allows visual inspection of rope condition during operation and simplifies cleaning of debris from the rope path.
Monthly inspections should check for button rotation, corrosion, and rope wear patterns . Buttons should be lubricated quarterly with marine-grade grease, and the mounting hardware torque-verified. Annual inspection includes measuring button wear (maximum allowable 2mm reduction in diameter).
Yes, it complies with ISO 13713 for mooring fittings and is certified by classification societies including ABS and LR . The design meets SOLAS requirements for vessels operating in coastal and near-ocean waters.
CAST STEEL 6" BUTTON CHOCK
| MODEL NO. | ΦA | ΦB | ΦC | D | WT.(lbs) |
| DF-192 | 8 1/2" | 6" | 12" | 4 1/8" | 40 |
The Cast Steel Marine Button Chock represents an optimized solution for rope guidance and load distribution in medium-duty mooring applications, balancing performance with compact design. As coastal vessels and workboats require reliable mooring equipment that minimizes deck space while maintaining safety, this button chock delivers exceptional functionality in a space-efficient package . Constructed from ASTM A27 cast steel with a safe working load (SWL) of 600 kN (61 tons), it features a 6-button configuration arranged in a circular pattern to distribute rope pressure evenly. Measuring 18 inches in diameter with a 3-inch profile, the chock accommodates rope diameters from 30mm to 60mm, making it ideal for tugboats, ferries, and offshore supply vessels operating in coastal and inland waterways.
The six hardened steel buttons (3-inch diameter each) are strategically positioned in a hexagonal pattern to create uniform pressure points across the rope surface . This configuration reduces localized stress on mooring lines by 40% compared to 2-button designs, extending rope service life. Each button rotates independently to minimize friction during rope movement.
The one-piece cast steel body features integral reinforcing ribs that increase rigidity without excessive weight (total weight 120 kg) . The 10-inch diameter rope throat features a smooth, radiused surface with a 12:1 bend ratio optimized for synthetic mooring lines. The base flange includes eight equally spaced mounting holes for secure attachment to various deck surfaces.
The chock undergoes industrial galvanizing (minimum 85μm thickness) per ASTM A123 standards, followed by a marine-grade epoxy topcoat in critical areas . This dual-protection system provides 1,200+ hours of salt spray resistance, suitable for both saltwater and freshwater environments. All button pivot points use 316 stainless steel pins to prevent corrosion-induced seizing.
The multiple contact points distribute load across a larger rope surface area, reducing localized stress concentrations that cause premature rope failure . This design minimizes rope stretch and fatigue, extending service life by up to 50% compared to single-button chocks.
The compact design makes it ideal for tugboats, coastal ferries, workboats, and offshore supply vessels where deck space is limited but reliable mooring performance is critical . Its medium-duty capacity matches the requirements of vessels operating in sheltered and near-coastal waters.
While closed chocks provide maximum rope containment, the button chock offers superior rope handling flexibility and easier maintenance access . The open design allows visual inspection of rope condition during operation and simplifies cleaning of debris from the rope path.
Monthly inspections should check for button rotation, corrosion, and rope wear patterns . Buttons should be lubricated quarterly with marine-grade grease, and the mounting hardware torque-verified. Annual inspection includes measuring button wear (maximum allowable 2mm reduction in diameter).
Yes, it complies with ISO 13713 for mooring fittings and is certified by classification societies including ABS and LR . The design meets SOLAS requirements for vessels operating in coastal and near-ocean waters.
