English 
T: +86-156-0511-1716
E: hp018@hpcbkj.com
E: hp018@hpcbkj.com
In Fangong Industrial Park, Dongtai Town, Dongtai City
The stern shaft is a core component of marine propulsion systems, responsible for transmitting torque from the ship’s engine to the propeller.
| Quantity: | |
|---|---|
It directly impacts the ship’s navigation efficiency, safety, and maintenance costs. Our stern shafts are engineered to withstand harsh marine conditions (seawater corrosion, vibration, high torque) and are tailored to meet diverse ship operation and budget needs.
Premium Material Selection: Forged from high-quality carbon steel (45 steel, 40Cr) and stainless steel (316L) to balance strength and corrosion resistance.
Cost Flexibility: Multiple material options to fit budget-sensitive projects (carbon steel) and high-performance demands (316L stainless steel).
Precision Manufacturing: Strict machining controls reduce wear and extend service life.
Corrosion Protection: Surface treatments (chroming, passivation) enhance durability in freshwater and seawater environments.
Model | Material | Applicable Ship Type | Diameter Range (mm) | Length Range (m) | Max Working Pressure (MPa) | Corrosion Resistance Class |
SS-P01 | 45 Steel | Inland cargo ships | 100–300 | 1.0–3.0 | 0.8 | C2 (Freshwater) |
SS-P02 | 40Cr | Coastal fishing vessels | 150–350 | 1.5–4.0 | 1.0 | C3 (Mild seawater) |
SS-P03 | 316L Stainless Steel | Ocean-going freighters | 200–500 | 2.0–5.0 | 1.2 | C4 (Severe seawater) |
Forged Structure: Hot forging improves material density, reducing the risk of cracks and deformation under high torque.
Heat Treatment Optimization: Quenching and tempering (HB220–250 for carbon steel; HRC30–35 for stainless steel) enhances mechanical strength.
Precision Machining: Journal accuracy (IT6 grade) and surface roughness (Ra 1.6μm) ensure smooth cooperation with stern tube bearings and seals.
Inland Waterways (e.g., River Cargo Vessels): The SS-P01 (45 steel + chroming) balances cost and performance, ideal for freshwater operations with low corrosion risk.
Coastal Fisheries: The SS-P02 (40Cr) resists vibration and impact during trawling, ensuring stable torque transmission.
Ocean Shipping: The SS-P03 (316L) prevents seawater rust and leakage, cutting maintenance costs for long-haul voyages.
Each stern shaft undergoes a 6-step production process:
Raw Material Inspection: Chemical composition and mechanical property testing to ensure material compliance.
Hot Forging: Shapes the blank to improve grain structure and strength.
Heat Treatment: Customized quenching/tempering to optimize hardness and toughness.
Precision Machining: CNC turning and grinding to achieve tight dimensional tolerances.
Surface Treatment: Chroming (carbon steel) or passivation (stainless steel) for corrosion resistance.
Non-Destructive Testing (NDT): Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) to detect internal/surface defects.
Structural highlights include tapered shaft transitions (reducing stress concentration) and standardized keyways (ensuring secure torque transfer).
Designed with universal interfaces, our stern shafts work with most standard stern tube seals (lip seals, mechanical seals) and bearings (white metal, rubber) from brands like John Crane and SKF. Clear markings (model, material, serial number) simplify on-site verification, while standardized tolerances speed up installation.
Tailor diameter, length, keyway size, and surface treatments (e.g., anti-fouling coatings for tropical waters) based on ship drawings.
Competitive Pricing: Transparent quotes with bulk discounts (10% off for orders over 10 units).
Quality Guarantee: ISO 9001 certification and 12-month warranty against manufacturing defects.
Rapid Support: Installation guidance, wear analysis, and spare parts (e.g., replacement journals) delivered within 48 hours.
