NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
Double row slewing bearings are heavy-duty rotary ring parts with two independent rows of rolling elements (usually steel balls) placed between an inner and outer ring.They safely support heavy axial forces,radial forces,and tilting moment loads all at the same time.Core Basic Specifications Materials:Ring forgings adopt 42CrMo & 50Mn alloy steel with full quenching treatment;rolling balls are high-strength GCr15 bearing steel with high surface hardness.Cages include standard carbon steel,high-temperature resistant brass,and lightweight self-lubricating engineering plastic.Size Range:Inner diameter 100-4000mm,outer diameter 150-450mm,overall structural height 50-400mm.Accuracy Grades:P0,P6,P5 industrial precision levels,matching heavy engineering equipment demands.Gear Types:Three standard series available:gearless (020),external gear (021/022),internal gear (023/024) to fit different hydraulic drive reducer layouts.Sealing Solutions:Standard non-contact labyrinth seals for general environments;triple-lip polyurethane contact seals for muddy,dusty,splash-heavy harsh environments.Fluoropolymer seals are optional for marine salt fog corrosive offshore conditions.Lubrication Modes:Marine anti-rust long-life grease for vessel deck operation;circulating oil lubrication for continuous heavy-load offshore rotary equipment.Standard operating temperature range:-30℃-120℃,custom low-temperature marine grease for polar offshore platforms down to -40℃.Delivery Cycle:Standard in-stock models ship within 7-15 working days;marine anti-corrosion customized versions require separate lead-time negotiation.
Marine & Offshore Machinery covers all marine vessels,offshore platform and floating facility rotary heavy equipment,including ship deck cranes,offshore pedestal lifting cranes,dredger rotary arms,FPSO turntable mechanisms,offshore wind installation vessel rotary supports,subsea equipment deployment turrets,floating dock rotary devices and ship unloaders.All marine and offshore equipment installs large slewing turntables to realize 360° full-angle rotation of lifting booms,dredging arms and subsea equipment mounting frames.During navigation and offshore operation,rotary bearings bear constantly changing eccentric overturning loads caused by ship rolling,pitching and heaving waves,plus heavy lifting dynamic impact loads during cargo and subsea module hoisting.Marine working conditions are extremely harsh with year-round high salinity salt fog,seawater splashing,high humidity,sea sand erosion and wide temperature fluctuations.Ordinary single-row slewing bearings easily suffer surface rust,raceway corrosion,structural deformation and premature wear under long-term marine corrosion and alternating wave loads,which leads to crane jitter,lifting safety hazards and long offshore maintenance shutdown losses.Therefore,all marine and offshore rotary heavy-duty equipment must adopt double row slewing bearings with high composite rigidity and full marine anti-corrosion treatment.
Two-Row Configuration:Features upper and lower raceways that distribute localized stress across dual lines of steel balls or rollers.
Same vs.Different Diameters:Available in same-diameter ball setups for simpler layouts or different-diameter ball designs (larger lower balls) to optimize high tipping-moment resistance.
Integrated Gearing:Frequently built with internal or external gear teeth cut directly into one of the rings to drive 360-degree rotation.
Induction-Hardened Raceways:Raceways are deep-quenched (typically HRC 55–62) to maximize surface wear resistance under severe marine wave impact load.
Construction and Lifting Machinery
Tower and Mobile Cranes:Support heavy lifting loads and allow smooth 360-degree rotation.Excavators and Loaders:Manage heavy digging forces and shifting weights during earth-moving work.Concrete Pumps:Handle steady movement and mechanical stress on job sites.
Renewable Energy Systems
Wind Turbines:Used in yaw and pitch systems to turn the massive blades and nacelle toward the wind.Solar Trackers:Help heavy solar panels follow the sun smoothly across the sky.
Marine and Port Equipment
Ship Cranes and Davits:Resist harsh sea conditions and off-center lifting loads.Port Handling Gear:Support loading and unloading heavy cargo containers safely.
Industrial and Specialty Uses
Rotating Tables:Used in factory assembly lines and heavy manufacturing platforms.Medical Systems:Provide stable,precise rotation in large scanning units like CT scanners.
Marine & Offshore
Machinery Vessel deck crane rotary bases,offshore platform pedestal crane slewing supports,dredger rotary arm bearings,FPSO rotating mechanisms,offshore wind installation ship turntables and subsea equipment deployment rotary frames all take double row slewing bearings as core load-bearing rotary components,operating stably under continuous wave vibration and long-term salt fog marine corrosion environments.
Strong Anti-Tilting Rigid Structure Resists Vessel Wave Loads:Ships and offshore platforms generate continuous rolling and pitching motion under ocean waves,creating constantly changing large eccentric tilting moments for slewing cranes.Double parallel ball rows evenly distribute all dynamic loads on two independent raceways,greatly reducing turntable elastic deformation during lifting.It suppresses boom sway when hoisting heavy marine cargo and subsea modules,eliminating lifting tilt safety risks for offshore operations.
Complete Marine Anti-Corrosion System Adapts Salt Fog Environment:Custom marine-grade zinc-aluminum thermal spray coating + C5-M anti-corrosion treatment cooperates with fluoropolymer triple-lip sealing to block seawater splash and salt fog penetration.Special marine anti-rust grease prevents metal oxidation inside raceways,avoiding bearing rust failure caused by long-term offshore service and cutting frequent underwater maintenance work.
Excellent Fatigue Performance Extends Offshore Service Life:42CrMo fully quenched inner and outer rings feature superior impact fatigue resistance,adapting millions of cyclic rotation cycles of 24-hour uninterrupted offshore cranes.Unlike single-row bearings requiring frequent replacement,marine customized double row slewing bearings extend service life to 8–12 years,greatly reducing offshore platform shutdown and vessel dock maintenance costs.
Multiple Gear Types Match Marine Hydraulic Drive Systems:Gearless,external gear and internal three structural series perfectly match marine hydraulic reducer and servo drive systems of deck cranes and offshore lifting equipment.Ship machinery manufacturers do not need to redesign transmission structures,shortening vessel equipment R&D and on-board assembly debugging cycles.
Wide-Temp Marine Lubrication Fits Global Sea Areas:Custom low-temperature anti-solid grease for polar offshore platforms and high-temperature anti-oxidation lubricant for tropical offshore projects are available.No grease failure or dry friction occurs under extreme sea temperature differences to guarantee uninterrupted all-weather marine operation.
Compact Integrated Design Saves Vessel Installation Space:One double row slewing bearing replaces multiple groups of single bearing combinations,thinning the overall height of crane rotary turrets.It saves limited deck and offshore platform layout space,helps optimize vessel structural weight and lowers overall shipbuilding and offshore engineering costs.
Newbeetrans is a professional manufacturer specialized in marine & offshore customized double row slewing bearings.We supply standard stock bearings and full C5-M salt-fog resistant marine-grade anti-corrosion slewing solutions for shipyards and offshore engineering equipment manufacturers worldwide.
Full Marine-Grade Inspection Standard:All inner and outer rings adopt integral forging + deep raceway quenching process; every marine dedicated bearing undergoes salt spray aging,seawater immersion and heavy wave impact fatigue tests before delivery.
Diversified Marine Customization Service:Support 42CrMo alloy steel with marine anti-corrosion coating,fluoropolymer triple-lip salt-proof sealing,ocean anti-rust wide-temperature grease,internal/external/gear three gear forms and large-diameter tailor-made models for ship deck cranes and offshore platform lifting turrets.
Stable Fast Delivery:Standard series bearings are in stock for shipment within 7–15 days; marine offshore customized bearing samples can be finished within 10–15 days based on vessel drawing technical standards.
Authoritative Quality Certification:All products comply with international marine equipment standards,and third-party marine anti-corrosion SGS test reports can be provided upon customer request.
Global One-stop Technical Support:Complete cross-border ocean logistics service; professional bearing engineers provide load calculation,sealing and anti-corrosion coating selection guidance for all marine and offshore rotary mechanisms.
For technical specifications,pricing,or custom bearing solutions:
Email:paul@newbeetrans.com
Website:www.newbeetrans.com
WhatsApp
sales@newbeetrans.com
+8615090185276