Duramax Marine

For over 25 years, Duramax® Marine has supplied water-lubricated rubber bearings for Military propulsion shaft applications. Our fully molded sleeve, flanged and stave type bearings are tested and manufactured to stringent Military specifications. In our bearing test facility, new polymer and bearing materials are tested for load carrying capability, coefficient of friction and system wear life. This commitment to product testing and development helped Duramax® Marine become the world leader in water-lubricated rubber bearing technology.

DURAMAX® MARINE BEARINGS

Duramax® Marine water-lubricated rubber bearings are manufactured with specially formulated nitrile rubber and are molded to provide shaft clearances in accordance with U.S. Navy and Bureau of Ships specifications. These bearings possess low coefficient of friction and inherent vibration-dampening qualities and are non-polluting. Standard bearing sizes are available from stocking distributors and sales agents worldwide, or you can order custom materials and sizes to meet special applications.

JOHNSON CUTLESS® SLEEVE BEARINGS

Precision machined, Naval brass shell with nitrile rubber lining meets MIL-B-17901B (SH) Class II bearing specifications
Over 100 inch and metric sizes in stock, with custom sizes available upon request

JOHNSON CUTLESS® NON-METALLIC SLEEVE BEARINGS

Corrosion-resistant non-metallic shell with nitrile rubber lining
Over 100 inch and metric sizes in stock, with custom sizes available upon request

JOHNSON CUTLESS® FLANGED BEARINGS

Centrifugally cast Naval brass shell with integral flange and nitrile rubber lining, meets MIL-B-17901B (SH) Class II bearing specifications
Solid and split types available: over 70 sizes in stock with custom sizes available upon request

JOHNSON CUTLESS® DEMOUNTABLE RUBBER STAVE BEARINGS

Tough, molded nitrile rubber bearing staves allow bearing change-out without shaft or propeller removal
Bearing sizes available up to 36 inch shaft diameter over 2,000 installations operating worldwide

ROMOR® I BEARING STAVES

Made from specially formulated nitrile rubber bonded to Ultra High Molecular Weight Polyethylene (UHMW-PE) backing. Bearing surface with a controlled thickness, 15 to 20 micro-inch, glass-smooth finish and 80 Durometer, Shore A, hardness. This provides lower coefficient of friction, less break-in running time, vibration dampening, quiet operation and longer bearing and shaft life. Meets MIL-B-17901B (SH) Class III bearing specifications.

Special bearing profile provides minimum approach angle between bearing surface and shaft, lowering the coefficient of friction and aiding in solid particle rejection
Individually replaceable staves reduce maintenance costs and are fully interchangeable with Class I, brass backed staves

ROMOR® SEGMENTAL HOUSINGS

Centrifugal cast bronze housings are precision machined with keystone or dovetail slots
Longitudinal water grooves between bearing staves provide optimum water flushing and lubrication
Available in split or solid configurations, custom lengths and diameters

DURAMAX® MARINE SEALING SYSTEMS

Duramax® Marine offers an extensive choice of propulsion and rudder shaft sealing systems which accommodate a wide range of shafting sizes and system design requirements.

Duramax® Marine is the world leader in water-lubricated rubber bearing technology for Military propulsion shaft applications. Our fully molded sleeve, flanged and stave type bearings are tested and manufactured to stringent Military specifications.

A Stern Tube Bearing (Split Scalloped Shell Johnson Cutless Bearing). These bearings possess low coefficient of friction and inherent vibration-dampening qualities and are non-polluting.

Romor® I Bearing Staves are fully interchangeable with brass backed Class I staves. Romor® staves are made from specially formulated nitrile rubber bonded to Ultra High Molecular Weight Polyethylene (UHMW-PE) backing.

The Duramax® Shaft Seal System is designed to solve problems associated with other types of shaft seals. Dripless seal technology reduces oily contaminated water in the bilge and covered spring chamber provides secondary water seal for backup protection.

A Johnson Commercial Stuffing Box - ruggedly constructed, offering dependable performance from air, water and grease services.

DURAMAX® SHAFT SEAL SYSTEM

Special face seal design reduces maintenance and shaft wear
Dripless seal technology reduces oily contaminated water in the bilge and covered spring chamber provides secondary water seal for backup protection
Available for propeller shaft applications with different mounting adapters, simplifying installation and reducing retrofit costs

JOHNSON STUFFING BOXES

Ruggedly constructed, offering dependable performance from air, water and grease services. Water supply connection lubricates rubber bearings and grease fitting with lantern ring lubricates compression packing
Innovative "air seal" design allows packing change-out without dry-docking vessel
Several models available in bronze, aluminum or steel for propeller and rudder applications

Projects

SSN Seawolf Class

The Seawolf was designed as a faster, better-armed eventual replacement for the Los Angeles class nuclear-powered attack submarines.
NSSN Virginia-Class Attack Submarine

The Virginia-Class new attack submarine is an advanced stealth multimission nuclear-powered submarine for deep ocean anti-submarine warfare and littoral (shallow water) operations.
LHD Wasp Class Amphibious Assault Ships

Wasp-class landing helicopter dock (LHD) amphibious assault ships are built by Northrop Grumman Ship Systems (formerly Litton Ingalls Shipbuilding) of Pascagoula, Mississippi, US.
SSBN / SSGN Ohio Class Submarine

The Ohio Class submarines serve the US Navy as virtually undetectable undersea launch platforms of intercontinental missiles.
HMS Ocean (LPH01) Helicopter Carrier

The UK Ministry of Defence issued an invitation to tender in July 1987 for an amphibious helicopter carrier for the Royal Navy.
Horizon Class

Italy and France each ordered two Horizon Class anti-air warfare (AAW) frigates in October 2000. The frigates are being
Albion Class LPD (R) Landing Platform Dock

On 18 July 1996, the UK Ministry of Defence announced a £450m order with Vicker's Shipbuilding and Engineering, now BAE
Huon Class

The Huon design is based on the Italian Gaeta/Lerici Class. Six minehunters have been built by ADI in Newcastle, Austral
La Fayette Class Frigate

The French Navy's La Fayette Class multipurpose stealth frigates were developed by DCN International (now DCNS) and buil
SSN Los Angeles Class Nuclear Submarine

The United States Navy has 51 nuclear powered Los Angeles Class submarines, 16 in the Pacific Fleet and 32 in the Atlant
Kang Ding Class

The Kang Ding Class are La Fayette Class frigates built for the Taiwanese Navy. In 1992, the Taiwanese government contra
Avenger Class Mine Countermeasures Vessels

14 Avenger mine countermeasures vessels were commissioned between 1987 and 1994 and are in service with the US Navy. The
Supply Class

The Supply Class fast combat support ships were supplied to the US Navy by National Steel and Shipbuilding of San Diego.
Eilat Class Multi Mission Naval Corvettes

In the early 1980s, the Israeli Navy awarded a contract to Northrop Grumman Ship Systems (formerly Litton Ingalls Shipbu
Kirov Class (Type 1144.2) (Peter the Great)

The Russian heavy missile cruise ship, Project 1144.2 Kirov Class was built by the Baltic Shipyard in Saint Petersburg.
LSD Whidbey Island/Harpers Ferry Class - Dock Landing Ships - Amphibious Assault Vessels

The Whidbey Island Class and the Harpers Ferry Class are dock landing ships which support amphibious operations includin