Heavy-Duty Marine Steel Portholes – Watertight & Gastight Solutions
High-Pressure Rated Portholes for Demanding Marine Environments
Our heavy-duty marine steel portholes are engineered to withstand extreme water pressures exceeding 100Pa, making them ideal for installation below the freeboard deck where watertight and gastight integrity is critical. These structurally reinforced portholes provide superior safety and durability for commercial vessels, offshore platforms, and naval ships.
Key Features & Benefits
✔ Ultra-Strong Construction – High-tensile steel withstands 100+ Pa water pressure
✔ Complete Watertight/Gastight Seal – Triple-sealed gasket system
✔ Heavy-Duty Hardware – Grade 8.8 marine bolts for secure fastening
✔ Corrosion-Resistant – Hot-dip galvanized or epoxy-coated finishes
✔ Storm-Ready Design – Reinforced deadlights for emergency protection
Technical Specifications
| Clear Size (D) mm | Flange OD (D1) mm | Glass Size (D2) mm | Frame OD (D3) mm | Deadlight OD (D4) mm | Cutout (D5) mm | Height (h) mm | Glass Thickness (t) mm | Bolt Size | Bolt Qty |
|---|---|---|---|---|---|---|---|---|---|
| φ200 | φ245 | φ204 | φ250 | φ350 | φ310 | 155 | 10 | M16(12) | 8 |
| φ250 | φ295 | φ254 | φ305 | φ400 | φ364 | 182 | 12 | M16 | 8 |
| φ300 | φ350 | φ304 | φ360 | φ450 | φ414 | 207 | 15 | M16 | 12 |
| φ350 | φ400 | φ354 | φ410 | φ500 | φ464 | 232 | 15 | M18 | 12 |
| φ400 | φ450 | φ404 | φ460 | φ550 | φ514 | 257 | 19 | M18 | 12 |
| φ450 | φ500 | φ454 | φ510 | φ600 | φ564 | 282 | – | M20 | 12 |
The description/sizes may be different with goods, please check with us when order.
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