Motomaxsfr 520SX3 is a W-ring sealed 520 motorcycle drive chain for high-load street, touring, competition and off-road use. It combines a 38 kN ultimate tensile rating with 120-link and 128-link supply options for 250–900 cc motorcycle applications.
520 Fit Depends On Sprocket Width, Link Count And Chain Line
A 520 chain shares its 15.875 mm pitch with 525 and 530 chains, but its 6.35 mm inner width is different.
The complete drive system must use matching 520 front and rear sprockets, the correct link count and an aligned chain line.
Размер цепи
Nominal Pitch
Nominal Inner Width
Interchange Result
520
15,875 мм
6,35 мм
Required sprocket width for this model
525
15,875 мм
7,94 мм
Not interchangeable with 520 sprockets
530
15,875 мм
9,53 мм
Not interchangeable with 520 sprockets
GREASE RETENTION
W-Ring Sealing Protects Grease Under Dust, Water And Repeated Load
The 520SX3 articulation points face repeated load reversals while road water and abrasive dust attack the external chain surfaces.
Its W-ring and three-chamber grease-retention structure keeps lubricant around the pin-and-bush joint and limits contaminant entry.
Internal Grease Stays At The Pin-And-Bush Joint
The W-ring creates multiple sealing lips and grease spaces around the loaded articulation point, reducing dry metal contact as the chain bends around each sprocket.
Intact Seals Limit Water And Abrasive Entry
The sealing path slows water and fine-particle entry into the joint. A displaced, cut or missing ring removes that protection and becomes a replacement trigger.
External Surfaces Still Need Sealed-Chain Lubricant
Cleaning, drying and compatible lubrication protect rollers, plates, seals and sprocket contact surfaces after rain, washing, mud or dust exposure.
REPLACEMENT DECISION
Condition Triggers Matter More Than A Fixed Replacement Mileage
Street, touring, competition and off-road use expose the same chain to very different loads, water, dust and maintenance intervals.
Replacement is due when measured wear, stiff links, damaged rollers or W-rings, corrosion, abnormal noise or sprocket damage reaches the applicable limit.
Measured Wear Shows Cumulative Joint Loss
Wear measurement across the specified number of links reveals pitch growth caused by pin-and-bush wear; chain slack alone does not establish remaining service life.
Full-Loop Inspection Finds Local Damage
Uneven slack, tight spots, cracked plates, damaged rollers, moved pins and missing W-rings can occur locally, so the complete loop needs inspection.
Chain And Sprockets Are Assessed Together
Hooked, broken or badly worn sprocket teeth can accelerate wear in a new chain. A replacement decision includes both sprockets and the installed chain.
COMPLETE SPECIFICATIONS
520SX3 Dimensions, Strength And Supply Configuration
The model combines standard 520 drive-system dimensions with W-ring sealing and two orderable link counts.
Heat-treated alloy-steel plates, pins, bushes and rollers with elastomer W-rings and internal grease
Drive-System Interface
Matching 520 front sprocket, rear sprocket and connecting link
Dimensional Basis
ISO 10190 motorcycle-chain dimensional convention
Marking And Traceability
520SX3 model marking and production-batch identification
Packaging Unit
One chain with matched connecting link per retail box; export master carton
APPLICATIONS & EQUIPMENT
520SX3 Applications Across Road, Competition And Off-Road Riding
The installed motorcycle must specify a 520 final-drive chain and use a link count that matches its sprocket and wheelbase arrangement.
01
High-Load Street And Touring Motorcycles
The 520SX3 suits 250–900 cc motorcycles whose original specification calls for a 520 chain, with link count selected to match the approved sprocket and wheelbase setup.
02
Competition And Modified Sport Motorcycles
The drilled link design and 38 kN tensile rating support rapid load changes in competition and modified sport use when chain line, sprockets and slack follow the vehicle setup.
03
Off-Road And Mixed-Surface Riding
The W-ring sealing structure retains internal grease and limits contaminant entry for forest roads, gravel and desert use, while external cleaning and lubrication remain part of routine maintenance.
MATERIALS & MANUFACTURING
Heat-Treated Steel Components Support Sealed High-Load Articulation
Material selection, heat treatment and the W-ring grease-retention structure work together at the chain's loaded joints.
Alloy-Steel Plates, Pins, Bushes And Rollers
Heat-treated steel components carry tensile and impact loads while the roller-and-bush geometry transfers load into matching 520 sprocket teeth.
Controlled Forming, Heat Treatment And Assembly
Plate forming, pin and bush preparation, heat treatment, dimensional control and riveted assembly establish strength, articulation and repeatable fit.
W-Rings, Internal Grease And Color-Finished Plates
Elastomer W-rings retain grease at each sealed joint. Black, red, gold, orange, blue and green plate finishes support motorcycle styling choices.
PERFORMANCE & WORKING CONDITIONS
38 kN Strength With A 7-Million-Cycle Fatigue Test
The published model values describe the chain configuration; actual replacement timing still depends on fit, load, contamination, lubrication and inspection results.
38 кНПредельная прочность на разрыв≥7.0 kNFatigue test load7 millionCycles without breakage1.75 kgMass per 100 links
Motorcycle Range250–900 cc
Riding EnvironmentsStreet, touring, competition and off-road
Drive-System LimitsMatching 520 sprockets, correct link count, chain line and vehicle-specified slack
Heat And Chemical LimitsKeep away from direct exhaust heat, flame and incompatible cleaners or lubricants
CUSTOMIZATION
Length, Plate Color, Branding And Export Packing Options
The 520SX3 can be quoted as a standard chain or configured for an OEM supply program.
Length: 120L or 128L
Plate color: black, red, gold, orange, blue or green
Connecting link: matched rivet-link supply
Branding: private label, model marking and box artwork
Packing: retail box, master carton and pallet labeling
Installation, Inspection And Lubrication For A 520 Sealed Chain
Vehicle-specific slack, axle torque and connecting-link dimensions take precedence over generic settings.
01
Verify The 520 Drive-System Match Before Installation
Confirm that the front sprocket, rear sprocket and chain are all 520 size. Match the 120L or 128L chain to the approved vehicle setup, inspect the new chain and sprockets for damage, and use the connecting-link method supplied with the chain.
02
Align The Rear Wheel And Set Vehicle-Specified Slack
Install with the engine off and the motorcycle securely supported. Keep the front and rear sprockets in one chain line, set slack using the motorcycle manufacturer's measuring position and range, then secure and recheck the axle and adjusters.
03
Inspect The Full Chain Loop For Tight Spots And Damage
Rotate the rear wheel by hand and inspect the full loop for uneven slack, stiff links, damaged rollers, displaced W-rings, loose rivets, corrosion and abnormal sprocket teeth. Stop riding when structural damage, skipping or derailment risk appears.
04
Clean, Dry And Lubricate After Water Or Abrasive Dust
Use a cleaner and lubricant approved for sealed motorcycle chains. Dry the chain before lubrication, apply lubricant to the working link area, wipe away excess, and inspect again after rain, washing, mud, sand or extended high-load riding.
Keep Hands And Tools Away From A Moving Chain Never inspect, clean or lubricate the drive chain under engine power. Replace a structurally damaged chain and assess both sprockets as part of the same final-drive system.
PURCHASING CONDITIONS
100-Chain MOQ With 7-Day Samples And 20–30-Day Production
Order terms are structured around one model, one finish and an approved packing configuration.
Minimum Order Quantity100 chains per model and finish
Sample PolicyOne paid sample; cost credited against a qualifying bulk order
Standard Sample Lead Time7 working days
Bulk Production Lead Time20–30 working days after approval
Price BasisFOB Ningbo or Shanghai in USD
Export PackagingRetail box, export master carton and pallet
Payment Terms30% deposit; 70% balance before shipment
Shipping SupportCourier, air freight or sea freight
PRE-SALES & AFTER-SALES SERVICE
Specification Review, Batch Inspection And Repeat-Supply Support
The service path connects vehicle fit and sample approval to traceable production and later reorder matching.
520 Fit And Link-Count Review Before Quotation
Model, sprocket width, link count, motorcycle displacement, riding use, plate finish and packing are reviewed before quotation.
Dimensional, Hardness, Tensile And Fatigue Controls
Approved samples define color and packing, while production lots receive dimensional and mechanical controls with batch records.
Shipment Documents And Repeat-Batch Matching
Installation guidance, shipment-document support, complaint review and repeat-order batch matching continue after delivery.
Motomaxsfr
