Marine Shafting

Your Professional Marine Shafting Supplier

Wuxi Junzhi Machinery Equipment Manufacturing Co., Ltd was established in the early 1990s. In the early days of the factory, it mainly cooperated with Shanghai Baoshan Iron and Steel Group Corporation, Shanghai Electric Group Heavy Machinery Plant, and Shanghai Tunnel Company Machinery Manufacturing Branch to engage in the manufacturing and processing of supporting parts for metallurgical and mining equipment, and complete sets of customized processing of non-standard equipment in other machinery industries.The main processing equipment includes CNC plasma cutting equipment, gas shielded welding, large CNC lathes, CNC gantry milling, vertical machining centers, ultrasonic flaw detectors, hardness testers, etc.

Why Choose Us

High Quality

Our factory strictly implements the GB/T9 001-2008 quality system, and continuously improves its products to win customer satisfaction.

Professional Team

After years of continuous development, the factory has trained a group of high-quality workers and technical teams.

24-Hour Service

Our dedicated 24-hour online support ensures prompt responses, providing you with an excellent shopping experience. Feel free to reach out with any questions at any time.

Our Factory

Wuxi Junzhi Machinery Equipment Manufacturing Co., Ltd. (formerly Wuxi Yaqing Machinery Factory), the new factory is located at No. 1087 Guangshi Road, Luoshe Town, Huishan District, Wuxi City, 20 minutes away from Beijing-Shanghai High-speed Railway, 15 minutes away from Wuxi Airport, and about 40 minutes away from Taihu Lake and other famous scenic spots. The transportation is very convenient.

Description of Rudder Stock

The rudder stock is also named the rudder shaft, which connects the steering gear with the rudder blade; the rudder stock transmits the steering gear’s turning force to the rudder blade to steer the ship. Usually, the rudder stock is made of forged steel. The rudder stock connects to the rudder blade by hydraulic cone fit or flange coupling; and connects to the tiller by hydraulic cone fit, a key connection, or by clamping rings for smaller rudders. Stainless steel sleeves are fitted in the way of bearings to protect the stock from getting damaged.

Forged Steel

100% Ultrasonic Flaw Detection Test

ABS, BV, DNV, GL, LR,NK, RINA,KR, CCS, etc.

Chemical Composition; UT,MT; Mechanical Property; Dimension Check

Ingot—forging—heat treatment—rough machining—UT.MT—Q+T—inspection—finishing machining—UT.MT—packing

Normalized / Annealed / Quenched / tempered

Description of Marine Coupling
The shaft coupling is the component to be joined the propeller shaft and the gearbox output flange.
Some are bolted directly to the gearbox but many users adopt a flexible couplings like R&D flexible couplings.

Marine Propeller Shaft Coupling
Material:	Steel, stainless steel, Alloy steel;
Processing methods:	Ingot---forging---heat treatment---rough machining---UT.MT---Q+T---inspection---finishing machining---UT.MT---packing
Dimension:	Min.OD 300mm,wall thickness:min.100mm;length:150-4000mm
Standard:	ASTM,JIS,DIN,ISO,API,EN
Package:	Wooden cases,steel strip and wooden pallets or wooden cases

Types of Rudder Stock

Standard Rudder Stock: This is the most common type, designed for general maritime use, providing a balance of strength and weight.

Heavy-Duty Rudder Stock: Engineered to withstand higher torque and loads, ideal for larger vessels or extreme conditions.

Custom Forged Rudder Stock: Tailored designs to meet unique specifications or operational requirements, offering flexibility in marine design.

Corrosion-Resistant Rudder Stock: Treated with protective coatings, these are suited for vessels operating in saline environments.

Types of Marine Coupling

Rigid Couplings

These are used where precision alignment is necessary. They provide a solid connection and are suitable for low-torque applications.

Flexible Couplings

Designed to handle misalignment better than rigid types, flexible couplings are ideal for applications that experience vibration or displacement.

Disc Couplings

Composed of metal discs, these couplings support high torque and high-speed applications while offering excellent flexibility and reliability.

Elastic Couplings

Utilizing elastomeric materials, these couplings can accommodate misalignment and absorb significant shock loads effectively.

Advantages of Rudder Stock

High Strength: The forging process increases the density and structural integrity of the steel, offering enhanced toughness.

Corrosion Resistance: When adequately treated, forged steel can withstand harsh marine environments, extending service life.

Cost-Effective

While initial investments may be higher, the durability and reduced maintenance needs lead to significant cost savings in the long run.

Customizability

Forged steel stocks can be tailored in dimensions and specifications, accommodating a variety of vessel designs.

Improved Performance

Forged steel rudder stocks ensure precise control and stability at sea, ensuring safer navigation.

Advantages of Marine Coupling

Durability: High-quality materials, such as stainless steel and bronze, ensure long-lasting performance and resistance to corrosion.

Improved Efficiency: By ensuring optimal alignment and reducing energy loss during power transfer, the coupling contributes to fuel efficiency.

Safety: A well-functioning coupling mitigates the risk of mechanical failures, ensuring safer operations at sea.

Maintenance-Friendly: Quality couplings are designed for easy inspection and maintenance, leading to reduced downtime and repair costs.

Applications of Rudder Stock

●Yachts and Sailboats: Provides reliable steering control for recreational watercraft.
●Commercial Shipping: Essential for cargo ships, tankers, and bulk carriers, ensuring smooth navigation.
●Fishing Vessels: Facilitates efficient maneuverability in tight fishing areas.
●Naval Ships: Customized designs support critical military operations and enhanced performance.

Applications ofMarine Coupling
●Commercial Shipping: Essential in the main propulsion systems of cargo vessels, tankers, and bulk carriers.
●Recreational Boating: Used in powerboats and yachts to ensure smooth operation of the propulsion system.
●Offshore Engineering: Critical for equipment used in oil exploration and extraction, where reliability is paramount.
●Marine Generators: Employed in generators supplying power to various marine and offshore facilities.

Transport

productcate-554-193

Packaging and delivery

Selling Units:Single item
Single package size:15X15X15 cm
Single gross weight:0.540 kg

Lead time

Quantity (pieces)	1 - 100	101 - 500	> 500
Lead time (days)	15	25	To be negotiated

FAQ

Q: What is a marine coupling?

A: Marine. A connection between two lengths of the propeller shafting. Most shafts are connected to each other by means of forged flanges. Muff couplings and removable flanges are alternatives.

Q: Which coupling is universal type?

A: A universal or Hooke's coupling is used to connect two shafts whose axes intersect at a small angle. The inclination of the two shafts may be constant, but in actual practice, it varies when the motion is transmitted from one shaft to another.

Q: What type of connection is coupling?

A: A coupling is a mechanical element part that connects two shafts together to accurately transmit the power from the drive side to the driven side while absorbing the mounting error (misalignment), etc. of the two shafts.

Q: What do you call the casing where the rudder stock is inserted?

A: The rudder trunk encloses a rudder stock(3) which transfers the torque of a steering gear(1) to a rudder blade(2). A box structure(8) having an internal space is installed on the upper side of the rudder trunk, in contact with a steering gear deck(7).

Q: What material is used for rudder stock?

A: Historically stainless steel 316 has been the preferred rudder shaft material. This material was chosen as it was non corrosive and relatively strong and widely available. At the end of last century alternative rudder stock materials like aluminium and high strength stainless steel became widely available.

Q: What is the minimum yield for rudderstocks?

A: 2.3. 3 For rudder stocks, pintles, coupling bolts and keys the minimum specified yield stress is not to be less than 200 N/mm 2.

We're professional marine shafting manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy high-grade marine shafting from our factory.

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