Uses for Duramax Cutless Bearings

The Duramax Cutlass Bearings have won the heart of many marine professionals around the globe. Johnson Cutless has maintained an original brand that can only be accessed from the Duramax Marine. The Duramax Cutlass bearing, which is the first and still is the only one that meets all MIL-DTL-17901C Class II specs, serves as a testament to Duramax Marine's commitment to quality.
Duramax Marine's high-quality standards, unrivaled maritime expertise, and decades of water-lubricated rubber bearing research have produced unsurpassed performance achievements.


Here are the key properties of Duramax cutlass bearings for boats:
Superior Performance: The Duramax cutlass bearings are securely molded and tightly linked into a nautical brass or non-metallic shell of a proprietary blend of extremely strong chemicals and oil that are resistant rubber polymer. The rubber lining is filled with grooves, allowing for optimum lubrication water flow and heat dissipation.
Hydrodynamic Grit Rejection: The bearing "land" regions are sealed, as are the leading and trailing ends, resulting in hydrodynamic grit rejection. Grit is flushed away through alternating grooves to prevent shaft damages.

The Water Wedge Principle: The rubber polymer's elasticity allows the landing surface to bend and form a natural crevice, allowing for the creation of a hydrodynamic lubricating film that fully separates the bearing area from the shaft. The coefficient of friction is below 0.001 at this point, resulting in reduced system wear.
Why Rubber? Rubber, when lubricated with water, has among the most slippery properties of any substance. Sliding on a wet metal surface may eliminate virtually all friction, making it ideal for water-lubricated bearings.

Duramax Cutlass Bearings

Other benefits include: Rubber's elasticity allows grit and grime to be trapped within its surface until they are removed, preserving the shaft from scratches. Rubber is adaptable to a wide range of lubricants, including water. Rubber doesn't fail in a sudden manner when deprived of water. It may crystallize, but it always returns to normal shape. Every rubber landing surface is a separate bearing surface. The heat insulation characteristics of water-lubricated rubbers are superior to those of oils. Water absorbs twice the amount of heat as oil when equal weights are compared.
Rubber Water-Lubricated Bearings as an Environmental Solution in today's marine industry, the demands of environmental restrictions, increasing maintenance expenses, and ever-increasing replacement rates have all conspired to push the use of lubricated rubber bearings as an answer. With rubbers using water as a lubricant, the use of contamination seals reduces.

As a result, pumps and tanks remain insignificant and this leads to a simpler and cost-effective shaft bearing system.

Rubber Properties and Their Applications in Water-Lubricated Bearings. The lined bearing's proprietary rubber construction is broken up into a number of lands or faces by water grooves. These surface lands run parallel to the shaft and support it. When grits get caught in the shaft/rubber interface, it is compressed into the landing's elastic surface and it is immediately rolled into an adjacent water groove, where it is quickly removed from the bearing.

The water wedge forms in the rubber landing when it is loaded correctly, rotating at a high speed, and with adequate clearances. This results in the shaft riding on a thin film of water that completely separates the shaft and bearing surface. In a rubber bearing, friction and wear are reduced considerably at this stage. Deep Blue Yacht Supply is an international leader when it comes to providing cutless bearings to the marine and pump industries across the globe.