COB SERIES NAUTICAL CYLINDERS
Grices COB Series Marine Hydraulic Cylinders are the ideal solution for maritime applications thanks to their construction in AISI 316 stainless steel and OT58 brass, which ensures complete resistance to corrosion. They feature a clean design for moving hatches and extending gangways. They provide a nominal pressure of 8 MPa and undergo hydraulic testing on 100% of production to ensure maximum reliability. The available product codes are: COB 30, COB 40.
Grices COB Series Marine Hydraulic Cylinders are a key component of the standard marine product range offered by Grices. Designed to meet the strict requirements of the maritime sector, these hydraulic actuators combine mechanical precision with excellent environmental resistance. Each component is developed to ensure seamless integration into onboard systems, delivering consistent performance even under demanding operating conditions or when exposed to particularly aggressive weather conditions.
The main strength of the COB Series lies in the selection of construction materials, chosen to ensure complete resistance to corrosion over time. The cylinder piston rod is made of ground AISI 316 stainless steel, an alloy renowned for its exceptional resistance in saline environments. At the same time, the main structural components, including the rear end cap, cylinder tube and front end cap, are manufactured entirely from OT58 brass. This combination of AISI 316 stainless steel and OT58 brass gives the cylinder a clean design and robust construction, ideal for withstanding the wear typical of marine applications.
Thanks to their clean design and high corrosion resistance, Grices COB Series Marine Hydraulic Cylinders are specifically designed for marine applications. The main applications for this series include the actuation and movement of hatches and gangway extension mechanisms. The reliability of these cylinders ensures smooth and safe movement, essential for managing movable structures aboard vessels.
In terms of performance, the COB Series is designed to operate at a continuous nominal pressure of 8 MPa and can reach a maximum pressure of 12 MPa to withstand operating peaks. The range is available with bore sizes from 30 to 40 mm and customised strokes of up to 2000 mm. The piston rod diameters (MM) are 18 mm for the 30 mm bore version and 22 mm for the 40 mm bore version. The hydraulic connections (EE) are sized at 1/8″ and 1/4″ respectively, allowing easy connection to standard circuits.
The hydraulic sealing system uses elastomer and nitrile seals, materials selected for their high sealing capacity under pressure. These seals, supplied exclusively by leading manufacturers, ensure not only high performance but also easy international availability for maintenance operations. Product reliability and durability are further ensured by strict quality controls on production equipment and rigorous hydraulic testing performed on 100% of the cylinders before they are placed on the market. When ordering, the component is correctly identified by specifying the model code followed by the stroke length in millimetres, for example COB 30/500.
| Feature | Value |
|---|---|
| Nominal Pressure (continuous operation) | 8 MPa |
| Maximum Pressure | 12 MPa |
| Bore Size | 30 – 40 mm |
| Maximum Stroke | up to 2000 mm |
| Piston Rod Material | Ground AISI 316 stainless steel |
| End-Cap and Tube Material | OT58 brass |
| Seals | Elastomer + Nitrile |
| Main Applications | Marine sector, hatches, gangways |
| Product Code | Bore Size (AL) | Piston Rod (MM) | Connection (EE) | Piston Rod Thread (KK) | Maximum Pressure |
|---|---|---|---|---|---|
| COB 30 | 30 mm | 18 mm | 1/8″ | M14x1,5 | 12 MPa |
| COB 40 | 40 mm | 22 mm | 1/4″ | M16x1,5 | 12 MPa |