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DF-343-5
HEE
DF-343-5 4 DOG RAISED WATERTIGHT HATCH
MODEL NO. | ΦA | B | WT.(lbs) |
| DF-343-5 | 19" | 5" | 99 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | DOG HANDLE | 4 | CAST IRON |
| 5 | TUMBLE BOLT | 4 | BRONZE |
The DF-343-5 4 Dog Raised Watertight Hatch builds on the proven performance of four-dog designs with specialized enhancements for demanding marine environments. Developed specifically for vessels operating in coastal and offshore regions, this hatch incorporates military-grade features into a commercial-access solution . Measuring 22 × 18 inches and weighing 135 lbs, it provides expanded access compared to standard 4-dog models while maintaining the operational simplicity that makes this configuration popular. The DF-343-5 is particularly valued for its ability to withstand vibration and dynamic loads encountered in offshore supply vessels and workboats.
Each of the four spring-loaded dogs incorporates a locking detent mechanism that prevents loosening under continuous vibration, a critical feature for offshore applications . The dogs maintain consistent compression force (150 lbs per dog) even during prolonged operation in rough seas, ensuring the seal remains intact despite vessel movement. This system eliminates the need for frequent re-tightening common with standard dog latches.
The frame utilizes 1/4-inch thick steel plate with reinforced corners to distribute loads across the deck structure, preventing stress concentration around the opening . The hatch cover features a ribbed underside that increases rigidity without significant weight gain, allowing it to support deck equipment loads up to 500 lbs when properly installed. All structural welds meet AWS D1.1 maritime standards for strength and durability.
Beyond standard marine coatings, the DF-343-5 incorporates 316 stainless steel for all moving parts, including dog assemblies, hinge pins, and fasteners . The frame receives a two-part epoxy primer followed by polyurethane topcoat, providing superior resistance to salt spray and chemical exposure. This enhanced corrosion protection extends maintenance intervals in harsh offshore environments.
The DF-343-5 incorporates vibration-resistant detents, heavier-gauge steel construction, and 316 stainless steel components specifically engineered for offshore environments, providing 30% longer service life in demanding conditions compared to standard commercial models .
The hatch is certified to meet ABS Requirements for Watertight Closures and complies with USCG 46 CFR regulations for vessel access fittings . It is suitable for installation in SOLAS-regulated vessels requiring documented watertight performance.
The spring-loaded dogs should be inspected monthly for proper operation, with lubrication using marine-grade grease every three months . Under normal operating conditions, the detent mechanisms maintain calibration for 2,000+ operation cycles before adjustment is needed.
The DF-343-5 maintains functionality from -35°C to 90°C (-31°F to 194°F), with the nitrile gasket retaining elasticity across this entire range . This broad temperature tolerance makes it suitable for global operation from Arctic to tropical regions.
Yes, the DF-343-5 features a universal mounting pattern compatible with most standard 22 × 18 inch hatch cutouts, allowing retrofitting without major deck modifications . Adapter plates are available for non-standard installations requiring minimal deck alteration.
DF-343-5 4 DOG RAISED WATERTIGHT HATCH
MODEL NO. | ΦA | B | WT.(lbs) |
| DF-343-5 | 19" | 5" | 99 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | DOG HANDLE | 4 | CAST IRON |
| 5 | TUMBLE BOLT | 4 | BRONZE |
The DF-343-5 4 Dog Raised Watertight Hatch builds on the proven performance of four-dog designs with specialized enhancements for demanding marine environments. Developed specifically for vessels operating in coastal and offshore regions, this hatch incorporates military-grade features into a commercial-access solution . Measuring 22 × 18 inches and weighing 135 lbs, it provides expanded access compared to standard 4-dog models while maintaining the operational simplicity that makes this configuration popular. The DF-343-5 is particularly valued for its ability to withstand vibration and dynamic loads encountered in offshore supply vessels and workboats.
Each of the four spring-loaded dogs incorporates a locking detent mechanism that prevents loosening under continuous vibration, a critical feature for offshore applications . The dogs maintain consistent compression force (150 lbs per dog) even during prolonged operation in rough seas, ensuring the seal remains intact despite vessel movement. This system eliminates the need for frequent re-tightening common with standard dog latches.
The frame utilizes 1/4-inch thick steel plate with reinforced corners to distribute loads across the deck structure, preventing stress concentration around the opening . The hatch cover features a ribbed underside that increases rigidity without significant weight gain, allowing it to support deck equipment loads up to 500 lbs when properly installed. All structural welds meet AWS D1.1 maritime standards for strength and durability.
Beyond standard marine coatings, the DF-343-5 incorporates 316 stainless steel for all moving parts, including dog assemblies, hinge pins, and fasteners . The frame receives a two-part epoxy primer followed by polyurethane topcoat, providing superior resistance to salt spray and chemical exposure. This enhanced corrosion protection extends maintenance intervals in harsh offshore environments.
The DF-343-5 incorporates vibration-resistant detents, heavier-gauge steel construction, and 316 stainless steel components specifically engineered for offshore environments, providing 30% longer service life in demanding conditions compared to standard commercial models .
The hatch is certified to meet ABS Requirements for Watertight Closures and complies with USCG 46 CFR regulations for vessel access fittings . It is suitable for installation in SOLAS-regulated vessels requiring documented watertight performance.
The spring-loaded dogs should be inspected monthly for proper operation, with lubrication using marine-grade grease every three months . Under normal operating conditions, the detent mechanisms maintain calibration for 2,000+ operation cycles before adjustment is needed.
The DF-343-5 maintains functionality from -35°C to 90°C (-31°F to 194°F), with the nitrile gasket retaining elasticity across this entire range . This broad temperature tolerance makes it suitable for global operation from Arctic to tropical regions.
Yes, the DF-343-5 features a universal mounting pattern compatible with most standard 22 × 18 inch hatch cutouts, allowing retrofitting without major deck modifications . Adapter plates are available for non-standard installations requiring minimal deck alteration.
