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In the realm of marine mooring safety, the DF-2-40A Cast Steel Double Bitt stands as a cornerstone component for secure vessel anchoring and berthing operations. As ports and shipping lanes handle increasingly larger vessels—with container ships exceeding 24,000 TEUs—mooring equipment must deliver exceptional strength while accommodating dynamic load changes .
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DF-2
DF-2/2A/40/40A CAST STEEL DOUBLE BITT
| MODEL NO. | A | B | C | ΦD | ΦE | F | WT.(lbs) | HORN |
| DF-2 | 40" | 24" | 14" | 7" | 11" | 16" | 375 | × |
| DF-2A | 40" | 24" | 14" | 7" | 11" | 16" | 385 | √ |
| DF-40 | 45" | 27" | 15" | 9" | 13 1/2" | 18" | 545 | × |
| DF-40A | 45" | 27" | 15" | 9" | 13 1/2" | 18" | 560 | √ |
Constructed from ASTM A27 grade cast steel, this double bitt provides dual posts for multi-line mooring, offering flexibility in rope management during port operations. Measuring 36 inches in height with a 20-inch post spacing, the DF-2-40A delivers a safe working load (SWL) of 1200 kN (122 tons), making it ideal for bulk carriers, cruise ships, and offshore platforms requiring robust mooring solutions. Its one-piece casting design eliminates weld vulnerabilities, ensuring reliability in extreme weather conditions.
The DF-2-40A utilizes heat-treated ASTM A27 cast steel throughout its structure, achieving a minimum hardness of 180 BHN for superior wear resistance . Non-destructive testing (NDT) confirms zero internal defects, while the one-piece manufacturing process eliminates potential failure points common in welded alternatives. This construction enables the bitt to withstand sudden load spikes up to 150% of SWL during storm conditions without permanent deformation.
Featuring two 12-inch diameter posts spaced 20 inches apart, the double bitt configuration allows secure belaying of multiple mooring lines simultaneously . Each post includes a rounded top with a 3-inch chamfer to prevent rope fraying, while the 8-inch base flange distributes loads evenly across the deck structure. This design accommodates synthetic and steel mooring lines from 50mm to 100mm in diameter, supporting versatile port operations.
The bitt undergoes a multi-stage surface treatment process including sandblasting to SA 2.5 standards, application of a zinc-rich epoxy primer (120μm thickness), and a marine-grade polyurethane topcoat . This system provides 1,500+ hours of salt spray resistance per ASTM B117 testing, ensuring long-term performance in harsh saltwater environments. Drainage channels at the base prevent water accumulation around the mounting area.
The dual-post design allows independent securing of multiple mooring lines, reducing line interference and enabling precise tension adjustment for each line . This configuration provides redundancy during critical berthing operations, ensuring continued mooring security if one line requires adjustment or maintenance.
The bitt meets ISO 15621 requirements for mooring fittings and is certified by ABS and DNV . Its design incorporates safety factors exceeding SOLAS recommendations for passenger and cargo vessels operating in international waters.
The DF-2-40A is ideally suited for Panamax container ships, cruise liners, and offshore drilling rigs where high mooring loads and multiple line management are essential . Its robust construction also makes it suitable for port infrastructure like piers and docking facilities.
Monthly inspections should check for corrosion, line wear patterns, and tightness of mounting bolts . The surface coating should be touched up annually with compatible marine-grade paint, and NDT testing is recommended every 5 years to verify structural integrity.
Installation requires welded attachment to the vessel’s main structural members using continuous fillet welds meeting AWS D1.1 standards . Proper alignment with mooring winches and chocks is critical, with the bitt centerline positioned within 3° of the line pull direction to prevent side loading.
DF-2/2A/40/40A CAST STEEL DOUBLE BITT
| MODEL NO. | A | B | C | ΦD | ΦE | F | WT.(lbs) | HORN |
| DF-2 | 40" | 24" | 14" | 7" | 11" | 16" | 375 | × |
| DF-2A | 40" | 24" | 14" | 7" | 11" | 16" | 385 | √ |
| DF-40 | 45" | 27" | 15" | 9" | 13 1/2" | 18" | 545 | × |
| DF-40A | 45" | 27" | 15" | 9" | 13 1/2" | 18" | 560 | √ |
Constructed from ASTM A27 grade cast steel, this double bitt provides dual posts for multi-line mooring, offering flexibility in rope management during port operations. Measuring 36 inches in height with a 20-inch post spacing, the DF-2-40A delivers a safe working load (SWL) of 1200 kN (122 tons), making it ideal for bulk carriers, cruise ships, and offshore platforms requiring robust mooring solutions. Its one-piece casting design eliminates weld vulnerabilities, ensuring reliability in extreme weather conditions.
The DF-2-40A utilizes heat-treated ASTM A27 cast steel throughout its structure, achieving a minimum hardness of 180 BHN for superior wear resistance . Non-destructive testing (NDT) confirms zero internal defects, while the one-piece manufacturing process eliminates potential failure points common in welded alternatives. This construction enables the bitt to withstand sudden load spikes up to 150% of SWL during storm conditions without permanent deformation.
Featuring two 12-inch diameter posts spaced 20 inches apart, the double bitt configuration allows secure belaying of multiple mooring lines simultaneously . Each post includes a rounded top with a 3-inch chamfer to prevent rope fraying, while the 8-inch base flange distributes loads evenly across the deck structure. This design accommodates synthetic and steel mooring lines from 50mm to 100mm in diameter, supporting versatile port operations.
The bitt undergoes a multi-stage surface treatment process including sandblasting to SA 2.5 standards, application of a zinc-rich epoxy primer (120μm thickness), and a marine-grade polyurethane topcoat . This system provides 1,500+ hours of salt spray resistance per ASTM B117 testing, ensuring long-term performance in harsh saltwater environments. Drainage channels at the base prevent water accumulation around the mounting area.
The dual-post design allows independent securing of multiple mooring lines, reducing line interference and enabling precise tension adjustment for each line . This configuration provides redundancy during critical berthing operations, ensuring continued mooring security if one line requires adjustment or maintenance.
The bitt meets ISO 15621 requirements for mooring fittings and is certified by ABS and DNV . Its design incorporates safety factors exceeding SOLAS recommendations for passenger and cargo vessels operating in international waters.
The DF-2-40A is ideally suited for Panamax container ships, cruise liners, and offshore drilling rigs where high mooring loads and multiple line management are essential . Its robust construction also makes it suitable for port infrastructure like piers and docking facilities.
Monthly inspections should check for corrosion, line wear patterns, and tightness of mounting bolts . The surface coating should be touched up annually with compatible marine-grade paint, and NDT testing is recommended every 5 years to verify structural integrity.
Installation requires welded attachment to the vessel’s main structural members using continuous fillet welds meeting AWS D1.1 standards . Proper alignment with mooring winches and chocks is critical, with the bitt centerline positioned within 3° of the line pull direction to prevent side loading.
