GMP Marine Cutlass Rubber Bearing
GMP is one of the world’s most trusted names in the marine industry worldwide for over 35 years. Our bearings are used in rudder, shaft and stern gear applications for all types of marine vessels from naval ships, cargo/container ships, tankers, ocean liners, luxury yachts, to harbour tug boats, trawlers and costal fishing boats.
With continuing research and advancements in product technology, GMP Marine Cutlass bearings now exceed US Navy specifications in critical parameters like Tensile strength, elongation and bond strength.
GMP Marine Cutlass Rubber bearings are made to the highest quality standards, in materials, workmanship and dimensional accuracy (Clearance and tolerance is as per U.S. Navy Standard, BuShips plan number 810-1385664). Our bearings have proved its mettle by operating in the toughest conditions ranging from the arctic to the tropics, in shallow waters as well as high seas.
Our bearings cover a wide range of shaft diameters from 25mm to 400mm. (Bespoke sizes can also be made on request).
Our bearings are scientifically designed and manufactured by adept professionals; using premium grade material and skilled workmanship.
The inner groove design of GMP bearings combined with proprietary Nitrile rubber lining create a hydrodynamic lubricating film to separate the bearing surface and the shaft even at low shaft speeds. The grooves are designed for maximum lubricating water flow and dissipation of heat. Abrasive grit is flushed out through these grooves, protecting the shaft as well as the bearings from damage.
GMP Marine Cutlass rubber bearings are engineered with a proprietary formulation of Nitile rubber perfected over decades of research and development. The rubber is extremely tough and resistant to swelling, as well as exposure to chemicals and oil. This Nitrile rubber compound is molded and bonded with the metal or non-metallic shell. The bond strength between the shell and Nitrile rubber lining is an industry leading 235 PSI (16.5 Kg/sq. cm)
Concentricity and Cylindricity
Most manufacturers use centreless grinding techniques to finish the outside diameter but centreless grinding process does not take the inside diameter of the bearing into account, the centres of the outside diameter and inside diameter may not be the same.
GMP bearings are mounted on a mandrel and ground on a cylindrical grinder, thus achieving better concentricity as well as cylindricity to the full length of the bearing so that it is perfectly round, perfectly straight and has no taper, as compared to bearings turned on a lathe machine.
Density (Specific gravity)
1.25 ± 0.1
Hardness Shore A
65/75 shores A
(Min) 120 kgf/cm2
Permanent Compression set
Co- efficient of thermal expansion
Bond strength (rubber lining to shell)
235 PSI (16.5 Kg/sq. cm)