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In the booming marine hatch covers market projected to grow at a 7.5% CAGR from 2025 to 2035, the DF-503/504 Flush Multi-Bolt Oval Hatch stands out as a premium deck hardware solution for commercial and military vessels .
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DF-504
DF-503/504 FLUSH MULTI-BOLT OVAL HATCH
| MODEL NO. | A | B | C | D | WT.(lbs) |
| DF-503 | 29" | 21" | 23" | 15" | 104 |
| DF-504 | 30" | 24" | 24" | 18" | 132 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | RING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
Designed with a low-profile aesthetic that minimizes deck obstruction, these oval hatches provide secure access while maintaining structural integrity. The DF-503 model (Part No. 21113) features dimensions of 15 × 23 inches with an overall weight of 95 lbs, while the larger DF-504 (Part No. 21221) measures 18 × 24 inches and weighs 112 lbs . Both models integrate seamlessly into deck surfaces, making them ideal for areas with frequent foot traffic or equipment placement.
The hatch assembly consists of high-grade steel cover plate and deck ring, ensuring exceptional durability against operational wear and tear . This heavy-duty material selection meets the rigorous demands of maritime environments, providing long-term performance even in harsh weather conditions. Structural threads utilize reinforced hardware to maintain integrity under repeated use.
A neoprene gasket forms the primary waterproof barrier, with optional gasket materials available to suit specific environmental requirements . The multi-bolt design—featuring 20 bolts on the DF-503 and 24 bolts on the DF-504—distributes pressure evenly across the sealing surface, eliminating water intrusion points. Brass washers and stainless steel hex nuts prevent corrosion at critical fastening points .
Equipped with a sturdy steel handle and retainer system, the hatch allows for easy operation even with gloved hands . The flush design sits nearly level with the deck surface (3/4 inch elevation), reducing trip hazards while maintaining accessibility. All hardware components are designed for straightforward maintenance, with replacement parts readily available.
These oval hatches excel in cargo carriers and bulk carriers where unobstructed deck space is essential for cargo operations . Their waterproof construction makes them suitable for below-deck storage areas, engine compartments, and bilge access points. Military vessels benefit from the secure fastening system that withstands extreme sea conditions. The hatches also find applications in ferry deck designs where passenger safety and surface continuity are priorities.
The primary components include a steel cover plate and deck ring, with a neoprene gasket for sealing . Fasteners consist of steel hex head bolts, stainless steel hex nuts, and brass washers to prevent corrosion at critical points.
The structural design allows the hatches to withstand standard deck loads from foot traffic and equipment placement. The steel construction provides exceptional rigidity, with the frame contributing to overall deck strength when properly installed.
Yes, all components including gaskets, bolts, nuts, and handles have designated part numbers for easy replacement . Optional gasket materials can be specified for specialized applications requiring enhanced chemical resistance or temperature tolerance.
The DF-503/504 hatches are certified for use in commercial shipping vessels, military craft, and passenger ferries . Their versatile design accommodates installation in both deck and hull positions where watertight access is required.
At only 3/4 inch elevation above the deck surface, the hatch minimizes trip hazards in high-traffic areas . This low-profile design is particularly valuable in cargo handling zones and passenger walkways where unobstructed movement is essential.
DF-503/504 FLUSH MULTI-BOLT OVAL HATCH
| MODEL NO. | A | B | C | D | WT.(lbs) |
| DF-503 | 29" | 21" | 23" | 15" | 104 |
| DF-504 | 30" | 24" | 24" | 18" | 132 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | RING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
Designed with a low-profile aesthetic that minimizes deck obstruction, these oval hatches provide secure access while maintaining structural integrity. The DF-503 model (Part No. 21113) features dimensions of 15 × 23 inches with an overall weight of 95 lbs, while the larger DF-504 (Part No. 21221) measures 18 × 24 inches and weighs 112 lbs . Both models integrate seamlessly into deck surfaces, making them ideal for areas with frequent foot traffic or equipment placement.
The hatch assembly consists of high-grade steel cover plate and deck ring, ensuring exceptional durability against operational wear and tear . This heavy-duty material selection meets the rigorous demands of maritime environments, providing long-term performance even in harsh weather conditions. Structural threads utilize reinforced hardware to maintain integrity under repeated use.
A neoprene gasket forms the primary waterproof barrier, with optional gasket materials available to suit specific environmental requirements . The multi-bolt design—featuring 20 bolts on the DF-503 and 24 bolts on the DF-504—distributes pressure evenly across the sealing surface, eliminating water intrusion points. Brass washers and stainless steel hex nuts prevent corrosion at critical fastening points .
Equipped with a sturdy steel handle and retainer system, the hatch allows for easy operation even with gloved hands . The flush design sits nearly level with the deck surface (3/4 inch elevation), reducing trip hazards while maintaining accessibility. All hardware components are designed for straightforward maintenance, with replacement parts readily available.
These oval hatches excel in cargo carriers and bulk carriers where unobstructed deck space is essential for cargo operations . Their waterproof construction makes them suitable for below-deck storage areas, engine compartments, and bilge access points. Military vessels benefit from the secure fastening system that withstands extreme sea conditions. The hatches also find applications in ferry deck designs where passenger safety and surface continuity are priorities.
The primary components include a steel cover plate and deck ring, with a neoprene gasket for sealing . Fasteners consist of steel hex head bolts, stainless steel hex nuts, and brass washers to prevent corrosion at critical points.
The structural design allows the hatches to withstand standard deck loads from foot traffic and equipment placement. The steel construction provides exceptional rigidity, with the frame contributing to overall deck strength when properly installed.
Yes, all components including gaskets, bolts, nuts, and handles have designated part numbers for easy replacement . Optional gasket materials can be specified for specialized applications requiring enhanced chemical resistance or temperature tolerance.
The DF-503/504 hatches are certified for use in commercial shipping vessels, military craft, and passenger ferries . Their versatile design accommodates installation in both deck and hull positions where watertight access is required.
At only 3/4 inch elevation above the deck surface, the hatch minimizes trip hazards in high-traffic areas . This low-profile design is particularly valuable in cargo handling zones and passenger walkways where unobstructed movement is essential.
