Johnson Cutless Bearings Product Range
Duramax USA

Duramax Marine Bearings

Johnson Cutless Water Lubricated Bearings

8 Products Available Over 100 Sizes in Stock

Leading water lubricated bearing technology featuring Johnson Cutless bearings, rudder bushings, and specialized marine components. Environmentally compliant with 15+ year service life.

Key Features

Zero oil discharge
15+ year service life
Self-aligning design
Up to 3000 RPM

Complete Duramax Product Catalog

Johnson Cutless bearings, rudder bushings, shaft sleeves & more

Over 100 different sizes in stock - Custom sizes available upon request

Johnson Cutless Naval Brass Sleeve Bearings

Johnson Cutless Naval Brass Sleeve Bearings

These Naval Brass Sleeve Bearings adapt equally well to strut and stern tube mounts, and often used effectively as rudder-stock and pintle bushings. \n \n \n Diameters are precision fitted to the shaft size with correct clearance for efficient water lubrication. \n Thin shelled units are available for struts of small craft. \n Over 100 different sizes in stock \n Available in inch and metric sizes \n Custom sizes available upon request \n For shaft sizes: 3/4? to 6-1/2? (19.05mm ? 165.10mm) \n
Johnson Cutless Non-Metallic Sleeve Bearings

Johnson Cutless Non-Metallic Sleeve Bearings

These Non Metallic Sleeve Bearings feature a structure of engineered reinforced thermoset plastic. The nitrile rubber polymer liner that is bonded to shell, is non-corrosive and inherently resistant to chemicals, oil and grease, as well as being anti-electrolytic \n \n Lightweight \n Over 100 different sizes in stock \n Available in inch and metric sizes \n Custom sizes available upon request \n For shaft sizes: 3/4? to 6? (19.05mm ? 152.40mm) \n
Johnson Cutless Strut or Stern Tube Flanged Bearings

Johnson Cutless Strut or Stern Tube Flanged Bearings

Flanged Bearings are centrifically cast naval brass with an integral flange for bolting to stern tube or strut housing to retain bearing and prevent rotation in housing. Shells are heavy walled providing structural strength and can be step turned if desired. Shells are furnished un-drilled unless specified. \n \n Available in solid and split design \n Over 70 different sizes in stock \n Custom sizes available upon request \n For shaft sizes: 2? to 15? (50.80mm ? 381.00mm) \n
Johnson Cutless Forward Stern Tube Flanged Bearings

Johnson Cutless Forward Stern Tube Flanged Bearings

Flanged Bearings are centrifically cast naval brass featuring heavy metal wall and integral flange. Integral flange permits solid bolting of bearing to stern tube stuffing box. A machined male pilot on the integral flange mates with the female recess of the stuffing box. Shells are furnished un-drilled unless specified. \n \n Available in solid and split design \n Over 70 different sizes in stock \n Custom sizes available upon request \n For shaft sizes: 2-1/2? to 15? (63.50mm ? 381.00mm) \n
DX 490 Rudder Bushings

DX 490 Rudder Bushings

Duramax DX490 Rudder Bushings are molded from a 70 Scale D Durometer, Nitrile Rubber Compound, formulated to withstand the rugged ?impact? service encountered in a ship?s rudder steering system. They possess high rigidity for maximum dimensional stability while still retaining a degree of resiliency to dampen peak shock loads. They are homogenous cylinders molded with longitudinal lubrication grooves. \ndx490 \n \n Grease, oil and water serve equally well as lubricants \n Resistant to deterioration by hydrocarbons, acids, salt water corrosion and electrolysis \n Supplied with molded I.D. and O.D. dimensions with ample material for machining \n Sizes available: I.D. from 1.45? to 9.11? (36.83mm ? 231.39) \n O.D. from 2.35? to 12.22? (59.69mm ? 310.39mm) \n
Duramax DuraBlue Greaseless Rudder Bushing

Duramax DuraBlue Greaseless Rudder Bushing

DuraBlue is a self lubricated composite bushing designed for use in highly loaded oscillatory applications such as found in rudder, pintle and stearing gear assemblies. DuraBlue needs no lubrication and is exceptionally wear resistant with an extremely long wear life. It has a low coefficient of friction value of 0.04 to 0.08, resulting in no stick-slip during operation. DuraBlue experiences virtually no swelling in seawater, and a very low thermal coefficient of expansion. Its proprietary fiber matrix greatly extends wear life and a self-lubricating formulation for dry running. \n \n No lubrication is required \n High load capacity \n Dimensionally stable \n Chemical and corrosion resistant \n Tolerant to edge loading \n Sizes available: 1? ? 42? (2.5 ? 107cm) outside diameter. \n
Duramax NCB Shaft Sleeves

Duramax NCB Shaft Sleeves

Nickel-Chrome-Boron (NCB) alloy hard coating resists abrasion and corrosion protecting the shaft made of conventional materials, extending its wear life by as much as 4-5 times. \n \n Nickel Chrome Boron Alloy \n Gives maximum protection for Rudder Stock and Tail Shafts \n Extends bearing and shaft life \n
Johnson Cutless Stern Tube Filler

Johnson Cutless Stern Tube Filler

Johnson Cutless Stern Tube Filler is a specially formulated environmentally-friendly displacement medium from Duramax Marine that affords freeze damage protection structure for a vessel?s stern tube, propeller shaft and bearings during winter lay up. \n \n Non-Flammable \n Water Soluble \n Easy Application \n Easy Removal \n Biodegradable \n

Need Help Selecting the Right Bearing?

Our marine bearing specialists provide expert consultation on Duramax bearing selection, sizing, and installation for your specific application.

What We Need:

  • Shaft diameter and material
  • Operating speed and load conditions
  • Vessel type and application details
  • Installation constraints and requirements

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Request Technical Consultation Call (07) 3399 3433

Professional installation services available

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Technical Information

Learn more about Duramax bearing technology

Water Lubrication Technology

Duramax bearings represent the latest evolution in marine bearing technology, utilizing advanced polymer materials and precision engineering to deliver superior performance in water lubricated applications.

How Water Lubrication Works

Unlike traditional oil lubricated systems, Duramax bearings use seawater as the lubricant. The bearing material creates a thin hydrodynamic film that separates the shaft from the bearing surface, providing smooth operation with minimal friction.

Self-Aligning Design

The flexible bearing housing accommodates shaft deflection and misalignment, reducing installation tolerances and ensuring optimal load distribution across the bearing surface.

Technical Specifications

Operating Parameters

Max Speed: 3000 RPM
Load Capacity: Up to 5 MPa
Temperature Range: -10°C to +60°C
pH Range: 7.5 - 8.5

Physical Properties

Shaft Range: 50mm - 2000mm+
Length/Diameter Ratio: 0.5 - 2.0
Bearing Clearance: 0.5‰ - 2.0‰
Service Life: 15+ years
Environmental Benefits & Compliance

Duramax bearings meet and exceed international environmental regulations, making them ideal for vessels operating in sensitive marine areas and environmentally protected waters.

0%

Oil discharge to environment

100%

Biodegradable materials

85%

Reduction in maintenance chemicals

IMO Compliance

Fully compliant with International Maritime Organization standards

EPA Approved

Environmental Protection Agency approved for all waters

Antarctic Treaty Compliant

Approved for operation in Antarctic and Arctic waters

Installation & Maintenance

Installation Process

1
Preparation

Remove existing bearing and clean stern tube. Inspect shaft surface finish.

2
Fitting

Install Duramax bearing with proper clearances. Self-aligning design accommodates minor misalignments.

3
Testing

Perform rotation tests, verify water flow, commission with gradual load increase.

Maintenance Schedule

Daily Operation
  • • Monitor water flow and temperature
  • • Check for unusual vibrations or noise
  • • Verify seawater intake is clear
Monthly Inspection
  • • Visual inspection of bearing housing
  • • Check water flow rates and clarity
  • • Monitor shaft alignment
Annual Service
  • • Detailed bearing condition assessment
  • • Shaft surface inspection
  • • Water system cleaning and flow test
Ideal Applications

Duramax bearings excel in a wide range of marine applications across all vessel types.

Commercial Vessels

Cargo ships, tankers, bulk carriers

Luxury Yachts

Superyachts, motor yachts

Workboats

Tugs, patrol vessels, research vessels

Offshore Platforms

Oil rigs, wind platforms

Ready to Upgrade to Duramax Bearings?

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