Naval Brass Sleeve Cutless Bearings China Factory and Suppliers

YJM Naval Brass Sleeve Bearings are precision-engineered by a leading China factory. As expert suppliers, we provide durable cutless bearings for strut and stern tube mounts, rudder-stock, and pintle bushings, featuring efficient water lubrication and easy-fit polished brass shells.

SupplierJULU YJM HWMF SEAL CO.,LTD.www.yjmseal.com

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About this product

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YJM Naval Brass Sleeve Bearings, also known as Cutless Bearings, are high-performance marine components engineered for superior durability and efficiency. Utilizing a proprietary composite material developed by our in-house R&D team, these bearings feature a high-quality brass outer shell super-bonded to a fluted rubber lining, ensuring an optimal balance of structural rigidity and friction reduction for marine propulsion shafts.

Designed to replace traditional heavy metal bearings, the YJM series offers a lightweight alternative—reducing weight to approximately one-third of standard brass bearings—while eliminating the risk of galvanic corrosion. With exceptional resistance to oil, grease, and chemicals, these bearings provide precision-fitted clearances that enhance water lubrication and operational stability in demanding aquatic environments.

Detailed Parameters

Dimension Standard	Inch and Metric	Temperature Range	5°C to 70°C
Shaft Diameter Range	3/4" to 6-1/2" (19.05mm - 165.10mm)	Outer Shell Material	High-Quality Naval Brass
Inner Lining	Oil & Chemical Resistant Nitrile Rubber	Weight Profile	1/3 the weight of pure brass bearings
Special Feature	Anti-electrolytic Properties	Fitment Method	Light press fitting with set screws
Customization	Available upon request	Stock Availability	Over 100 different sizes in stock

Key Advantages

Corrosion Resistance

Anti-electrolytic properties eliminate galvanic corrosion, extending the lifespan of the propulsion system.

Extended Durability

Proprietary composite materials resist oil, grease, and harsh chemicals common in marine environments.

Lightweight Design

Reduces overall vessel weight by being only 1/3 the weight of traditional brass bearings.

Precision Clearance

Negligible swelling allows for closer running clearances and more efficient water lubrication.

Easy Installation

Polished external shells enable easy fitting via light press fitting and secure locking screws.

Versatile Sizing

Available in both inch and metric standards with custom sizes tailored to specific shaft needs.

Product Gallery

Management Platforms

Inventory Control

Rapid access to over 100 standard sizes ensuring minimal lead times for urgent repairs.

R&D Excellence

Continuous material innovation to improve temperature resistance and reduce friction.

Quality Assurance

Rigorous testing of rubber-to-brass bonding to prevent delamination under high pressure.

Custom Engineering

Bespoke sizing services for unique vessel struts and specialized marine shaft requirements.

Logistics Network

Efficient global shipping for maritime parts, supporting shipyards and owners worldwide.

Technical Support

Expert guidance on installation clearances and maintenance schedules for optimal life.

Investment Return Comparison

Feature	Traditional Brass Bearings	YJM Cutless Bearings
Weight	Heavy / High Mass	Ultralight (1/3 weight)
Corrosion Risk	High (Galvanic)	Negligible (Anti-electrolytic)
Chemical Resistance	Standard	High (Oil & Grease resistant)
Installation	Complex Fitting	Easy Press Fit & Lock
Running Clearance	Variable Swelling	Precision / Low Swelling

Frequently Asked Questions

Q: What are the benefits of anti-electrolytic properties in rubber bearings?

Anti-electrolytic properties prevent galvanic corrosion, which typically occurs when two dissimilar metals are in contact in saltwater, thereby significantly increasing the longevity of the bearing and the shaft.

Q: How is the rubber bonded to the brass shell in YJM bearings?

We use a proprietary super-bonding process that securely attaches specially formulated nitrile rubber to a fluted brass shell, ensuring the lining does not separate even under extreme operational stress.

Q: Can YJM Cutless Bearings handle high temperatures?

Yes, our bearings are designed to operate efficiently within a temperature range of 5°C to 70°C, matching the performance of traditional metal bearing materials.

Q: Do you offer custom sizes for specific marine shafts?

Absolutely. While we stock over 100 standard sizes, we can manufacture custom dimensions for shaft sizes ranging from 3/4" to 6-1/2" based on your specific technical drawings.

Q: Why is "negligible swelling" important for bearing performance?

Many rubber materials swell when exposed to oil or water. Our negligible swelling characteristic allows for tighter, more precise running clearances, which improves the efficiency of water lubrication.

Q: How are YJM bearings typically installed?

They are usually installed via light press fitting into the strut or stern tube and are then locked securely in place using cone-pointed set screws.