A boat propeller shaft, particularly for inboard systems, is a critical component designed to transmit power from the engine to the propeller, facilitating the propulsion of the boat. The propeller shaft passes through the hull via a stuffing box or seal, which prevents water entry while allowing the shaft to rotate freely. This setup is crucial for efficient boat operation, ensuring that the propeller receives the engine's power without any significant power loss, thus maintaining optimal performance and fuel efficiency in marine vessels.
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1-2 weeks delivery time Price incl. 19% VAT The Hemp Braid 6X6 mm is specifically designed for reliable watertight sealing of propeller shafts, ensuring optimal performance in aquatic environments. Made from sealed hemp, it features a square-section gland and is suitable for propeller shaft diameters of 20-25 mm. The product is available in packs of 2 meters, with the product number 2727811 FNI.
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€ 7,83
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1-2 weeks delivery time Price incl. 19% VAT The Hemp Braid 8X8 mm is a high-quality sealing product designed for reliable watertight applications, particularly for propeller shafts in marine and industrial settings. With a square-section gland, it fits shafts with a diameter of 20-25 mm and comes in a 2-meter pack. Its FNI product number is 2727812.
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€ 12,14
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1-2 weeks delivery time Price incl. 19% VAT The Hemp Braid 10X10 mm is a reliable solution for watertight sealing of propeller shafts in marine applications, featuring a square-section gland made from sealed hemp. Designed for shafts with a diameter of 20-25 mm, this product comes in a 2-meter pack and ensures durable performance. Product number: 2727813 FNI.
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€ 15,58
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1-2 weeks delivery time Price incl. 19% VAT The Hemp Braid is a durable sealing solution specifically designed for maintaining watertight integrity in propeller shafts. With dimensions of 12X12 mm and made from hemp sealed material, it features a square-section gland and is compatible with shaft diameters of 20-25 mm. Each pack contains 2 meters of this effective sealing solution, ensuring reliable performance for various applications. FNI Product Number: 2727814.
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€ 18,69
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1-2 weeks delivery time Price incl. 19% VAT The Seals RMTA is a high-performance seal designed for shaft diameters of 25 mm, made from flame-retardant rubber for enhanced durability. It operates effectively in temperatures ranging from -10 °C to +80 °C and is resistant to oil and grease, ensuring low friction. The product includes stainless steel cable ties and a packet of silicone grease that is seawater-resistant.
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€ 112,11
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1-2 weeks delivery time Price incl. 19% VAT The RMTA seals, designed for reliable protection and efficient operation in various conditions, are suitable for shafts with a diameter of 30 mm. Made from flame retardant rubber (CR), they can withstand contact with oil or grease, offering minimal friction and long service life. The seals operate effectively within a temperature range of -10 °C to +80 °C and come with stainless steel cable ties and a packet of seawater-resistant silicone grease.
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€ 120,74
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1-2 weeks delivery time Price incl. 19% VAT The Seals RMTA is a durable sealing solution designed for a shaft diameter of 35 mm, constructed from flame-retardant rubber ('CR') to withstand challenging conditions. Featuring oil and grease resistance, low friction characteristics, and including stainless steel cable ties and sea-water resistant silicone grease, it operates effectively within a temperature range of -10 °C to +80 °C.
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€ 146,61
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1-2 weeks delivery time Price incl. 19% VAT The Seals RMTA with a bronze bearing is designed for 40 mm diameter shafts, offering optimal performance and durability. Made from flame retardant rubber, it operates effectively in temperatures ranging from -10 °C to +80 °C, providing excellent protection against contaminants while reducing friction. Key features include resistance to oil and grease, low friction values, stainless steel cable ties, and a seawater-resistant silicone grease packet.
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€ 200,08
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1-2 weeks delivery time Price incl. 19% VAT The RMTA seals are designed for reliable performance under various conditions, making them ideal for durable applications. With a shaft diameter of 25 mm, they are made from flame-retardant rubber and can operate in temperatures ranging from -10 °C to +80 °C, while being resistant to oil and grease. The package includes stainless steel cable ties and a packet of seawater-resistant silicone grease, ensuring low friction values for enhanced efficiency.
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€ 110,39
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1-2 weeks delivery time Price incl. 19% VAT The RMTA seals, designed for shafts with a diameter of 30 mm, offer reliable performance and durability, made from high-quality flame retardant rubber (CR) and suitable for operating temperatures between -10°C and +80°C. These seals are resistant to oil and grease, feature low friction values, and come with stainless steel cable ties and silicone grease resistant to seawater, ensuring optimal functionality in various environments.
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€ 120,74
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1-2 weeks delivery time Price incl. 19% VAT The RMTA axial seals are designed for exceptional performance in various applications, featuring durability and low friction, ideal for oil or grease environments. With a 35 mm shaft diameter, they are made of flame-retardant rubber (CR) and can operate in temperatures ranging from -10 °C to +80 °C. These seals include stainless steel cable ties, a packet of silicone grease, and have special characteristics to withstand oil and grease contact, along with the added benefit of seawater resistant grease.
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€ 146,61
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1-2 weeks delivery time Price incl. 19% VAT The Seals RMTA with a resin bearing, designed for shafts with a diameter of 40 mm, provides reliable sealing solutions in various conditions. Constructed from flame retardant rubber, it features elastomeric 'CR' seals, is resistant to oil and grease, offers low friction values, and operates within a temperature range of -10 °C to +80 °C. The product includes stainless steel cable ties and comes with seawater-resistant silicone grease for enhanced performance.
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€ 200,08
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version 25 mm is designed for reliable transmission in metric propeller shafts, featuring a compact rubber construction ideal for tight spaces. It includes a plastic protection ring, stainless steel strap, rubber joint, grease tube, and mounting accessories. Key specifications include a product number of 2728325 FNI, a minimum support frame length of 38 mm, and recommended grease application every 200 hours, with a replacement interval of four years or 500 hours of operation.
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€ 46,90
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version 30 mm is a high-quality product designed for efficient operation in various applications. It features a rubber transmission suitable for metric propeller shafts, ensuring optimal sealing and lubrication. Key details include a product number of 2728330 FNI, a compact design for small installations, and a minimum support frame length of 38 mm. The kit includes essential items such as a plastic protection ring, stainless steel strap, rubber joint, grease tube, and mounting instructions, with maintenance recommendations for grease application every 200 hours and replacement after 4 years or 500 hours of use.
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€ 50,92
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version (35 mm) is engineered for optimal performance and durability, featuring a robust rubber transmission material and a compact design that fits in small spaces. It effectively replaces traditional braid prizes with improved sealing and requires a support frame length of at least 38 mm. With a recommended grease application interval of every 200 hours and a replacement schedule of every 4 years or 500 hours, the kit includes a plastic protection ring, stainless steel strap, rubber joint, grease tube with nozzle, and mounting instructions.
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€ 66,46
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version 40 mm is designed for optimal performance in metric propeller shafts, featuring excellent sealing and lubrication. With a diameter of 40 mm and made of rubber transmission material, it replaces traditional braid prizes and is compact for small spaces. Recommended maintenance includes grease application every 200 hours and replacement after 4 years or 500 hours of use. The kit includes a plastic protection ring, stainless steel strap, rubber joint, grease tube, and mounting hardware.
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€ 75,03
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version 45 mm is a modern solution for rubber transmission in metric propeller shafts, featuring optimal sealing and lubrication. Ideal for compact spaces, it serves as a replacement for traditional braid variants. Key specifications include a size of 45 mm with a compact design, a support frame length of at least 38 mm, and recommended grease application every 200 hours, with replacements needed after 4 years or 500 hours of operation. The kit includes a plastic protection ring, stainless steel strap, rubber joint, grease tube with nozzle, and mounting hardware.
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€ 80,40
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft Normal Version 50 mm is a compact and efficient solution designed for various applications, featuring a rubber transmission that offers excellent sealing and lubrication. With FNI Product Number 2728350, it requires a support frame of at least 38 mm for installation and needs maintenance every 200 hours of use, with a replacement schedule after 4 years or 500 hours of operation. The kit includes essential components such as a plastic protection ring, stainless steel strap, rubber joint, grease tube with nozzle, and mounting accessories.
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€ 87,10
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1-2 weeks delivery time Price incl. 19% VAT The EVO Version 25 mm Propeller Shaft is engineered for enhanced propeller efficiency through superior sealing and lubrication, featuring a compact design suitable for tight installations. It has a diameter of 25 mm and is made from rubber transmission material for metric shafts, replacing traditional braid prizes. The product requires a minimum support frame length of 38 mm and recommends grease application every 200 hours, with a replacement interval of 4 years or 500 hours of use. Each kit includes essential components such as a protection ring, stainless steel strap, rubber coupling, grease tube, brass cap, brass nozzle for hydrolubrication, and assembly instructions.
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€ 50,92
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1-2 weeks delivery time Price incl. 19% VAT The Propeller Shaft EVO Version is a 30 mm metric propeller shaft solution designed for optimal performance and longevity, featuring a rubber transmission material, perfect sealing, excellent lubrication, and a compact design suitable for small spaces. It serves as a replacement for traditional braid prizes with a minimum support frame length of 38 mm. Maintenance includes grease application every 200 hours and replacement after 4 years or 500 hours of use. Each kit comes with a plastic protection ring, stainless steel strap, rubber coupling, grease tube with nozzle, brass cap, hydrolubrication nozzle, and assembly instructions.
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€ 56,28
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How does the material of an inboard boat propeller shaft impact its performance and longevity?
The material of an inboard boat propeller shaft significantly influences both its performance and longevity. Typically crafted from stainless steel or sometimes bronze, these materials are chosen for their strength, resistance to corrosion, and ability to withstand the harsh marine environment. Stainless steel shafts, for example, offer excellent toughness and resistance to pitting and crevice corrosion, crucial for maintaining the integrity and efficiency of the marine propeller shaft over time. The durability of these materials ensures that the shaft can handle the mechanical stresses of transmitting power from the engine to the propeller without deforming or failing, thereby providing reliable performance and reducing the need for frequent replacements.
The precision in manufacturing inboard propeller shafts is crucial for optimal performance and longevity. Leading manufacturers use CNC (Computer Numerical Control) machining to ensure that each prop shaft is crafted to exact specifications, maintaining balance and reducing vibrations. This precision helps in achieving a seamless fit between the prop shaft and the prop hub, which is essential for the smooth transmission of power. Utilizing advanced manufacturing techniques, these inboard propellers are designed to meet the high standards of the marine industry, ensuring reliable and efficient operation in various boating conditions.
What are the common types of bearings used with marine prop shafts to ensure smooth operation?
Common types of bearings used with marine propeller shafts include cutlass bearings and roller bearings. Cutlass bearings, made from durable rubber and sometimes embedded with brass or other metals, are particularly favored for their ability to handle the high loads and abrasive conditions typical in the marine environment. These bearings ensure smooth operation by allowing the boat propeller shaft to rotate freely while minimizing friction and wear. Roller bearings, although less common in marine settings due to their susceptibility to corrosion, may also be used in some inboard boat propeller shaft designs where sealed units can protect against water ingress, offering efficient rotational performance and reliability.
Stainless steel inboard propellers and custom propeller solutions are crucial for achieving high performance and reliability in various boating conditions. Boat builders often choose stainless steel shafts and custom inboard propellers for their strength and resistance to corrosion. Various companies offer a range of shaft sizes and materials, including A19, A17, and A22 stainless shafts, ensuring durability and precision. Custom inboard propellers and shafts are machined to exact specifications, such as SAE J755 standards, to provide the best fit and performance. These components are essential for maintaining the integrity of the boat's propulsion system, reducing the risk of issues like bent prop shafts, and ensuring consistent and efficient power delivery.
What maintenance practices are essential for ensuring the longevity of marine propeller shafts?
Regular maintenance is crucial to ensure the longevity of marine propeller shafts. Key practices include frequent inspections for signs of wear or corrosion, particularly on inboard boat propeller shafts which are constantly exposed to marine elements. Lubrication of the shaft and its bearings is also essential to reduce friction and prevent overheating during operation. Additionally, it's important to check the alignment of the shaft periodically to ensure it has not shifted, as improper alignment can lead to uneven wear and potential damage to both the shaft and associated components, thereby maintaining optimal performance of the boat propeller shaft.
Maintaining the boat shaft also involves understanding the specific needs and variations of your equipment. General propeller-gp and exclusive boat shaft solutions are available for different boating requirements, ensuring the right fit and performance. OEM stock parts, including propeller tapers, are known throughout the marine industry for their reliability. Contact us for more information on our selection of precision-machined, high-strength shafts, which are cut to SAE J755 standards and offered with quick delivery. Our products strive to provide exceptional and innovative solutions for all boating needs. We look forward to assisting you with the finest boat shafts and components to support your important boating skills.
What types of Boat Propeller Shaft do you have in your catalog?
Stern Tubes for Boats, Cutlass Bearings, Propeller Shaft Seals, Boat Propeller Nuts, Flexible Shaft Couplings, Marine CV Joint & Drive Shafts