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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
Product Introduction
This ship's steel weather tight hatch cover is an essential deck sealing accessory for various types of ships, mainly used for sealing maintenance ports in outdoor decks, engine rooms, ballast tanks, fresh water tanks, oil tanks, and other locations. The product is made of ship steel plates and equipped with rubber sealing strips to achieve complete wind and rain tightness, effectively preventing seawater and rainwater from infiltrating the cabin and protecting equipment and cargo safety.
The product structure is sturdy, impact resistant, and corrosion-resistant, suitable for long-term use in high salt spray environments in the ocean. The opening method is simple and convenient, and can be operated by a single person without tools, with high maintenance efficiency. We offer a variety of standard sizes in stock and can customize different specifications according to customer drawings, widely suitable for various types of merchant ships, fishing boats, engineering ships, and offshore platforms. It is a commonly used accessory for ship owners in Southeast Asia, the Middle East, and Europe.
Product Features
★ Wind and rain tight sealing structure: equipped with dedicated rubber sealing strips, waterproof, wave resistant, and salt spray resistant, meeting the requirements for outdoor use of ships.
★ High strength steel material: made of integral steel plate, resistant to impact and trampling, not easily deformed, and has a long service life.
★ Corrosion resistant and durable: The surface is sprayed with anti-corrosion paint, suitable for seawater, salt spray, and humid environments, and will not rust after long-term use.
★ Easy to open: The handle type quick switch can be operated by a single crew member without the need for tools.
★ Universal standards: Complies with ship standards such as CB/T and ISO, has strong interchangeability, and can directly replace old hatch covers.
★ Multiple sizes available+customizable: Square, circular, and rectangular are all in stock and support customized sizes based on drawings.
★ Wide applicability: Suitable for almost all ships such as bulk carriers, oil tankers, general cargo ships, tugboats, fishing boats, offshore platforms, etc.
Application scenarios
Ship deck inspection port
Engine room and pump room maintenance port
Entrances to ballast tanks, fresh water tanks, and oil tanks
Sealing of anchor chain compartment and storage compartment
Various types of ship maintenance and replacement use
Product Parameters
Material: hull steel+rubber sealing strip
Surface: Anti corrosion paint
Structure: Square/Circular/Rectangular
Sealing: Weathertight with wind and rain
Standards: CB/T 3765, ISO
Installation: Welding or bolt fixing
Customization: Supports size and shape customization
Diagram and main accessories
| 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
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.
