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Introduction
Marine stepped shaft is a high-performance customized stepped mechanical shaft specially designed for marine and offshore engineering working conditions. With multi-diameter stepped shoulders along the axis, it realizes precise axial positioning for gears, bearings, couplings and other core components, while undertaking heavy torque transmission, rotary load support and long-term stable operation of ship power and propulsion systems.
Manufactured with marine-grade certified steel and strictly controlled whole-process precision machining and professional anti-corrosion treatment, our marine stepped shafts can adapt to extreme marine environments such as high salt spray, high humidity, strong corrosion and alternating heavy load impact, and meet the stringent reliability and safety requirements of global ship and offshore projects.
| Item | Details |
| Certified Standards | CCS, ABS, DNV, LR, BV, ISO, GB |
| Material Options | 45#, 40Cr, 42CrMo, 20CrMnTi, Marine Stainless Steel, Customized alloy |
| Diameter Range | Φ10mm – Φ800mm |
| Length Range | Up to 8000mm, fully drawing custom |
| Manufacturing Process | Forging → Rough Turning → Heat Treatment → Finish Machining → Precision Grinding → Anti-corrosion Treatment → NDT Inspection |
| Heat Treatment | Quenching & Tempering, Normalizing, Surface Hardening |
| Custom Machining | Keyways, Splines, Threads, Flanges, Special step structure |
| Tolerance Grade | ISO IT7 – IT10 |
Product Features
Excellent marine corrosion resistance, specially treated for long-term service in salt spray & seawater environment
High strength, outstanding torsion resistance, bending resistance and fatigue resistance under continuous heavy load
Ultra-high concentricity and low runout, ensuring smooth low-vibration high-speed rotation
Accurate shaft shoulder positioning, easy installation, alignment and on-board maintenance
Strict full quality inspection, 100% NDT (Non-Destructive Testing) available
Custom one-stop OEM & ODM service, fully fit unique vessel design requirements
Application Scope
Ship main propulsion system, intermediate shaft & stern shaft matching assemblies
Marine gearboxes, reduction gears, main engines and supporting motor units
Deck machinery: anchor winches, cranes, windlasses and marine hoisting equipment
Marine pumps, compressors, valve drive systems
Offshore platforms, offshore wind power and other ocean engineering heavy-duty equipment
Inland cargo ships, ocean-going vessels, engineering ships and special work ships
Quality & Service Promise
We provide complete factory test reports, material certificates, heat treatment records and third-party ship classification inspection certificates. Short lead time for sampling & mass production, professional seaworthy export packaging and global stable delivery supported.
