Tag Archives: tsubaki chain

China high quality Tsubaki Chain 24A-2 a Series Short Pitch Precision Duplex Roller Chains and Bush Chains with Link wholesaler

ProductDescription

ASeriesShortPitchPrecision DuplexRollerChains& BushChains

ISO/ANSI/DIN
ChainNo.

ChainNo.

Pitch

P
mm

Rollerdiameter

d1max
mm

Widthbetweeninner plates
b1min
mm

Pindiameter

d2max
mm

Pinlength

Innerplatedepth
h2max
mm

Platethickness

Tmax
mm

Transverse           Pt 
mm

Tensilestrength

Qmin
kN/lbf

Averagetensilestrength
Q0
kN

Weightpermeter
q  
kg/m

Lmax
mm
Lcmax
mm
one hundred twenty-two 24A-two 38.one hundred 22.23 25.22 eleven.ten 95.eight 99.7 35.70 4.80 45.44 254.00/57727 326.2 eleven.70

*Bushchain:d1inthetableindicatestheexternaldiameterofthebush

ROLLERCHAIN

Rollerchainorbushrollerchainisthetypeofchaindrivemostcommonlyusedfortransmissionofmechanicalpoweronmanykindsofdomestic,industrialandagriculturalmachinery,includingconveyors,wire-andtube-drawingmachines,printingpresses,autos,motorcycles,andbicycles.Itconsistsofa seriesofshortcylindricalrollersheldtogetherbysidelinks.Itisdrivenbya toothedwheelcalleda sprocket.Itisa simple,trustworthy,andefficientmeansofpowertransmission.

CONSTRUCTIONOFTHECHAIN

Twodifferentsizesofrollerchain,showingconstruction.
Therearetwotypesoflinksalternatinginthebushrollerchain.Thefirsttypeisinnerlinks,havingtwoinnerplatesheldtogetherbytwosleevesorbushingsuponwhichrotatetworollers.Innerlinksalternatewiththesecondtype,theouterlinks,consistingoftwoouterplatesheldtogetherbypinspassingthroughthebushingsoftheinnerlinks.The”bushingless”rollerchainissimilarinoperationthoughnotinconstructioninsteadofseparatebushingsorsleevesholdingtheinnerplatestogether,theplatehasa tubestampedintoitprotrudingfromtheholewhichservesthesamepurpose.Thishastheadvantageofremovingonestepinassemblyofthechain.

Therollerchaindesignreducesfrictioncomparedtosimplerdesigns,resultinginhigherefficiencyandlesswear.Theoriginalpowertransmissionchainvarietieslackedrollersandbushings,withboththeinnerandouterplatesheldbypinswhichdirectlycontactedthesprocketteethhoweverthisconfigurationexhibitedextremelyrapidwearofboththesprocketteeth,andtheplateswheretheypivotedonthepins.Thisproblemwaspartiallysolvedbythedevelopmentofbushedchains,withthepinsholdingtheouterplatespassingthroughbushingsorsleevesconnectingtheinnerplates.Thisdistributedthewearovera greaterareahowevertheteethofthesprocketsstillworemorerapidlythanisdesirable,fromtheslidingfrictionagainstthebushings.TheadditionofrollerssurroundingthebushingsleevesofthecZheJiang dprovidedrollingcontactwiththeteethofthesprocketsresultinginexcellentresistancetowearofbothsprocketsandchainaswell.Thereisevenverylowfriction,aslongasthechainissufficientlylubricated.Constant,clear,lubricationofrollerchainsisofprimaryimportanceforefficientoperationaswellascorrecttensioning.

LUBRICATION

Manydrivingchains(forexample,infactoryequipment,ordrivinga camshaftinsideaninternalcombustionengine)operateincleanenvironments,andthusthewearingsurfaces(thatis,thepinsandbushings)aresafefromprecipitationandairbornegrit,manyevenina sealedenvironmentsuchasanoilbath.Somerollerchainsaredesignedtohaveo-ringsbuiltintothespacebetweentheoutsidelinkplateandtheinsiderollerlinkplates.Chainmanufacturersbegantoincludethisfeaturein1971aftertheapplicationwasinventedbyJosephMontanowhileworkingforWhitneyChainofHartford,Connecticut.O-ringswereincludedasa waytoimprovelubricationtothelinksofpowertransmissionchains,a servicethatisvitallyimportanttoextendingtheirworkinglife.Theserubberfixturesforma barrierthatholdsfactoryappliedlubricatinggreaseinsidethepinandbushingwearareas.Additional,therubbero-ringspreventdirtandothercontaminantsfromenteringinsidethechainlinkages,wheresuchparticleswouldotherwisecausesignificantwear.[citationneeded]

Therearealsomanychainsthathavetooperateindirtyconditions,andforsizeoroperationalreasonscannotbesealed.Examplesincludechainsonfarmequipment,bicycles,andchainsaws.Thesechainswillnecessarilyhaverelativelyhighratesofwear,particularlywhentheoperatorsarepreparedtoacceptmorefriction,lessefficiency,morenoiseandmorefrequentreplacementastheyneglectlubricationandadjustment.

Manyoil-basedlubricantsattractdirtandotherparticles,eventuallyforminganabrasivepastethatwillcompoundwearonchains.Thisproblemcanbecircumventedbyuseofa “dry”PTFEspray,whichformsa solidfilmafterapplicationandrepelsbothparticlesandmoisture.

VARIANTSDESIGN

Layoutofa rollerchain:1.Outerplate,2.Innerplate,3.Pin,4.Bushing,5.Roller
Ifthechainisnotbeingusedfora highwearapplication(forinstanceifitisjusttransmittingmotionfroma hand-operatedlevertoa controlshaftona machine,ora slidingdooronanoven),thenoneofthesimplertypesofchainmaystillbeused.Conversely,whereextrastrengthbutthesmoothdriveofa smallerpitchisrequired,thechainmaybe”siamesed”insteadofjusttworowsofplatesontheoutersidesofthechain,theremaybethree(“duplex”),4(“triplex”),ormorerowsofplatesrunningparallel,withbushingsandrollersbetweeneachadjacentpair,andthesamenumberofrowsofteethrunninginparallelonthesprocketstomatch.Timingchainsonautomotiveengines,forexample,typicallyhavemultiplerowsofplatescalledstrands.

Rollerchainismadeinseveralsizes,themostcommonAmericanNationalStandardsInstitute(ANSI)standardsbeing40,50,sixty,and80.Thefirstdigit(s)indicatethepitchofthechainineighthsofaninch,withthelastdigitbeing0 forstandardchain,1 forlightweightchain,and5 forbushedchainwithnorollers.Hence,a chainwithhalf-inchpitchwouldbea #40whilea #160sprocketwouldhaveteethspaced2 inchesapart,and so on.Metricpitchesareexpressedinsixteenthsofaninchthusa metric#8chain(08B-1)wouldbeequivalenttoanANSI#40.Mostrollerchainismadefromplaincarbonoralloysteel,butstainlesssteelisusedinfoodprocessingmachineryorotherplaceswherelubricationisa problem,andnylonorbrassareoccasionallyseenforthesamereason.

Rollerchainisordinarilyhookedupusinga masterlink(alsoknownasa connectinglink),whichtypicallyhasonepinheldbya horseshoeclipratherthanfrictionfit,allowingittobeinsertedorremovedwithsimpletools.Chainwitha removablelinkorpinisalsoknownascotteredchain,whichallowsthelengthofthechaintobeadjusted.Halflinks(alsoknownasoffsets)areavailableandareusedtoincreasethelengthofthechainbya singleroller.Rivetedrollerchainhasthemasterlink(alsoknownasa connectinglink)”riveted”ormashedontheends.Thesepinsaremadetobedurableandarenotremovable.

USE

Anexampleoftwo’ghost’sprocketstensioninga triplexrollerchainsystem
Rollerchainsareusedinlow-tomid-speeddrivesataround600to800feetperminutehowever,athigherspeeds,around2,000to3,000feetperminute,V-beltsarenormallyusedduetowearandnoiseissues.
Abicyclechainisa formofrollerchain.Bicyclechainsmayhavea masterlink,ormayrequirea chaintoolforremovalandinstallation.A similarbutlargerandthusstrongerchainisusedonmostmotorcyclesalthoughitissometimesreplacedbyeithera toothedbeltora shaftdrive,whichofferlowernoiselevelandfewermaintenancerequirements.
Thegreatmajorityofautomobileenginesuserollerchainstodrivethecamshaft(s).Veryhighperformanceenginesoftenusegeardrive,andstartingintheearly1960stoothedbeltswereusedbysomemanufacturers.
Chainsarealsousedinforkliftsusinghydraulicramsasa pulleytoraiseandlowerthecarriagehowever,thesechainsarenotconsideredrollerchains,butareclassifiedasliftorleafchains.
Chainsawcuttingchainssuperficiallyresemblerollerchainsbutaremorecloselyrelatedtoleafchains.Theyaredrivenbyprojectingdrivelinkswhichalsoservetolocatethechainontothebar.

SeaHarrierFA.2ZA195front(cold)vectorthrustnozzle- thenozzleisrotatedbya chaindrivefromanairmotor
Aperhapsunusualuseofa pairofmotorcyclechainsisintheHarrierJumpJet,wherea chaindrivefromanairmotorisusedtorotatethemovableenginenozzles,allowingthemtobepointeddownwardsforhoveringflight,ortotherearfornormalforwardflight,a systemknownasThrustvectoring.

Put on

 

Theeffectofwearona rollerchainistoincreasethepitch(spacingofthelinks),causingthechaintogrowlonger.Notethatthisisduetowearatthepivotingpinsandbushes,notfromactualstretchingofthemetal(asdoeshappentosomeflexiblesteelcomponentssuchasthehand-brakecableofa motorvehicle).

Withmodernchainsitisunusualfora chain(otherthanthatofa bicycle)towearuntilitbreaks,sincea wornchainleadstotherapidonsetofwearontheteethofthesprockets,withultimatefailurebeingthelossofalltheteethonthesprocket.Thesprockets(inparticularthesmallerofthetwo)suffera grindingmotionthatputsa characteristichookshapeintothedrivenfaceoftheteeth.(Thiseffectismadeworsebya chainimproperlytensioned,butisunavoidablenomatterwhatcareistaken).Thewornteeth(andchain)nolongerprovidessmoothtransmissionofpowerandthismaybecomeevidentfromthenoise,thevibrationor(incarenginesusinga timingchain)thevariationinignitiontimingseenwitha timinglight.Bothsprocketsandchainshouldbereplacedinthesecases,sincea newchainonwornsprocketswillnotlastlong.Nonetheless,inlessseverecasesitmaybepossibletosavethelargerofthetwosprockets,sinceitisalwaysthesmalleronethatsuffersthemostwear.Onlyinverylight-weightapplicationssuchasa bicycle,orinextremecasesofimpropertension,willthechainnormallyjumpoffthesprockets.

Thelengtheningduetowearofa chainiscalculatedbythefollowingformula:

M= thelengthofa numberoflinksmeasured

S= thenumberoflinksmeasured

P= Pitch

Inindustry,itisusualtomonitorthemovementofthechaintensioner(whethermanualorautomatic)ortheexactlengthofa drivechain(oneruleofthumbistoreplacea rollerchainwhichhaselongated3%onanadjustabledriveor1.5%ona fixed-centerdrive).A simplermethod,particularlysuitableforthecycleormotorcycleuser,istoattempttopullthechainawayfromthelargerofthetwosprockets,whilstensuringthechainistaut.Anysignificantmovement(e.g.makingitpossibletoseethrougha gap)probablyindicatesa chainwornuptoandbeyondthelimit.Sprocketdamagewillresultiftheproblemisignored.Sprocketwearcancelsthiseffect,andmaymaskchainwear.

CHAINSTRENGTH

Themostcommonmeasureofrollerchain’sstrengthistensilestrength.Tensilestrengthrepresentshowmuchloada chaincanwithstandundera one-timeloadbeforebreaking.Justasimportantastensilestrengthisa chain’sfatiguestrength.Thecriticalfactorsina chain’sfatiguestrengthisthequalityofsteelusedtomanufacturethechain,theheattreatmentofthechaincomponents,thequalityofthepitchholefabricationofthelinkplates,andthetypeofshotplustheintensityofshotpeencoverageonthelinkplates.Otherfactorscanincludethethicknessofthelinkplatesandthedesign(contour)ofthelinkplates.Theruleofthumbforrollerchainoperatingona continuousdriveisforthechainloadtonotexceeda mere1/6or1/9ofthechain’stensilestrength,dependingonthetypeofmasterlinksused(press-fitvs.slip-in shape)[citationneeded].Rollerchainsoperatingona continuousdrivebeyondthesethresholdscanandtypicallydofailprematurelyvialinkplatefatiguefailure.

ThestandardminimumultimatestrengthoftheANSI29.1steelchainis12,500x (pitch,ininches)2.X-ringandO-Ringchainsgreatlydecreasewearbymeansofinternallubricants,increasingchainlife.Theinternallubricationisinsertedbymeansofa vacuumwhenrivetingthechaintogether.

CHAINSTHangZhouRDS

Standardsorganizations(suchasANSIandISO)maintainstandardsfordesign,proportions,andinterchangeabilityoftransmissionchains.Forexample,thefollowingTableshowsdatafromANSIstandardB29.1-2011(PrecisionPowerTransmissionRollerChains,Attachments,andSprockets)developedbytheAmericanSocietyofMechanicalEngineers(ASME).Seethereferences[8][9][10] foradditionalinformation.

ASME/ANSIB29.1-2011RollerChainStandardSizesSizePitchMaximumRollerDiameterMinimumUltimateTensileStrengthMeasuringLoad25

ASME/ANSIB29.1-2011RollerChainStandardSizes Measurement Pitch MaximumRollerDiameter MinimumUltimateTensileStrength MeasuringLoad twenty five .250in(6.35mm) .130in(3.30mm) 780lb(350kg) 18lb(8.2kg) 35 .375in(9.53mm) .200in(5.08mm) 1,760lb(800kg) 18lb(8.2kg) forty one .500in(12.70mm) .306in(7.77mm) one,500lb(680kg) 18lb(8.2kg) 40 .500in(12.70mm) .312in(7.92mm) three,125lb(1,417kg) 31lb(14kg) fifty .625in(fifteen.88mm) .400in(10.16mm) four,880lb(2,210kg) 49lb(22kg) sixty .750in(19.05mm) .469in(eleven.91mm) seven,030lb(3,190kg) 70lb(32kg) eighty 1.000in(25.40mm) .625in(fifteen.88mm) 12,500lb(5,700kg) 125lb(57kg) one hundred 1.250in(31.75mm) .750in(19.05mm) 19,531lb(8,859kg) 195lb(88kg) a hundred and twenty one.500in(38.10mm) .875in(22.23mm) 28,125lb(12,757kg) 281lb(127kg) one hundred forty 1.750in(44.45mm) one.000in(25.40mm) 38,280lb(17,360kg) 383lb(174kg) 160 2.000in(fifty.80mm) one.125in(28.58mm) 50,000lb(23,000kg) 500lb(230kg) one hundred eighty two.250in(fifty seven.15mm) one.460in(37.08mm) 63,280lb(28,700kg) 633lb(287kg) two hundred two.500in(sixty three.50mm) one.562in(39.67mm) 78,175lb(35,460kg) 781lb(354kg) 240 3.000in(seventy six.20mm) one.875in(forty seven.63mm) 112,500lb(fifty one,000kg) 1,000lb(450kg

Formnemonicpurposes,belowisanotherpresentationofkeydimensionsfromthesamestandard,expressedinfractionsofaninch(whichwaspartofthethinkingbehindthechoiceofpreferrednumbersintheANSIstandard):

Pitch(inches) Pitchexpressed
ineighths ANSIstandard
chainnumber Width(inches) 1four twoeight twofive 1eight three8 three8 3five 3sixteen 1two 48 41 1four one2 48 4 five16 5eight fiveeight five three8 3four six8 6 onetwo 1 88 8 five8

Notes:
one.Thepitchisthedistancebetweenrollercenters.Thewidthisthedistancebetweenthelinkplates(i.e.slightlymorethantherollerwidthtoallowforclearance).
2.Theright-handdigitofthestandarddenotes0 =normalchain,1 =lightweightchain,5 =rollerlessbushingchain.
3.Theleft-handdigitdenotesthenumberofeighthsofaninchthatmakeupthepitch.
four.An”H”followingthestandardnumberdenotesheavyweightchain.A hyphenatednumberfollowingthestandardnumberdenotesdouble-strand(2),triple-strand(3),andsoon.Thus60H-3denotesnumber60heavyweighttriple-strandchain.
 Atypicalbicyclechain(forderailleurgears)usesnarrow1⁄2-inch-pitchchain.Thewidthofthechainisvariable,anddoesnotaffecttheloadcapacity.Themoresprocketsattherearwheel(historically3-6,nowadays7-12sprockets),thenarrowerthechain.Chainsaresoldaccordingtothenumberofspeedstheyaredesignedtoworkwith,forexample,”10speedchain”.Hubgearorsinglespeedbicyclesuse1/2″x 1/8″chains,where1/8″referstothemaximumthicknessofa sprocketthatcanbeusedwiththechain.

Typicallychainswithparallelshapedlinkshaveanevennumberoflinks,witheachnarrowlinkfollowedbya broadone.Chainsbuiltupwitha uniformtypeoflink,narrowatoneandbroadattheotherend,canbemadewithanoddnumberoflinks,whichcanbeanadvantagetoadapttoa specialchainwheel-distanceontheothersidesucha chaintendstobenotsostrong.

RollerchainsmadeusingISOstandardaresometimescalledasisochains.

 

WHYCHOOSEUS 

one.ReliableQualityAssuranceSystem
2.Slicing-EdgeComputer-ControlledCNCMachines
three.BespokeSolutionsfromHighlyExperiencedSpecialists
4.CustomizationandOEMAvailableforSpecificApplication
five.ExtensiveInventoryofSparePartsandAccessories
six.Nicely-DevelopedWorldwideMarketingNetwork
seven.EfficientAfter-SaleServiceSystem

 

The219setsofadvancedautomaticproductionequipmentprovideguaranteesforhighproductquality.The167engineersandtechnicianswithseniorprofessionaltitlescandesignanddevelopproductstomeettheexactdemandsofcustomers,andOEMcustomizationsarealsoavailablewithus.Oursoundglobalservicenetworkcanprovidecustomerswithtimelyafter-salestechnicalservices.

Wearenotjustamanufacturerandsupplier,butalsoanindustryconsultant.Weworkpro-activelywithyoutoofferexpertadviceandproductrecommendationsinordertoendupwithamostcosteffectiveproductavailableforyourspecificapplication.TheclientsweserveworldwiderangefromenduserstodistributorsandOEMs.OurOEMreplacementscanbesubstitutedwherevernecessaryandsuitableforbothrepairandnewassemblies.

 

 

 

 

Deciding on a drive chain for a belt conveyor

The travel chain is utilised to move hefty objects on the conveyor chain. Chains are magnetic, antistatic, substantial temperature, or chemical resistant, dependent on the application. These kinds of travel chains are used in several various industries. A typical device that uses this sort of travel is a chain hoist. Chain hoists are made to carry weighty masses with minimal hard work. Chains are typically utilised to transportation weighty hundreds.

roller chain

No matter whether making use of a roller chain as a travel chain or a belt conveyor can be challenging. Regardless of whether it really is a small low-pace travel with guide lubrication or a substantial-velocity pump-lubricated drive with several sprockets, there are numerous aspects to take into account when picking a roller chain. Initial, you need to have to think about motor horsepower and rpm. The pace of the motor establishes how much chain you require. For illustration, if you are utilizing a lower-speed push, you will want to decide on a minimal-pitch, substantial-pitch chain. An additional issue to take into account is chain duration – preferably, you can go for an even amount of sprockets and chains, but in no way go scaled-down.
The lubrication program is also critical simply because the lubrication method must be in a position to produce adequate oil. The type of oil utilized to lubricate a chain relies upon on its operating atmosphere, temperature and pace. Dress in is induced by stress on the bearing, angular sliding of the pins, and rotation of the rollers. There are 5 various varieties of lubrication methods obtainable, dependent on the program used. A large-good quality carbon steel chain is a significant advantage when operating at high temperatures, as it can withstand greater temperatures.
The components of construction for roller chains range by application. Typically, the most common resources are steel and stainless steel, but occasionally alloy steels are utilized in meals processing equipment that might have lubrication problems. Nylon and brass are also sometimes employed. Some industries demand heavy-duty chains. If you want an incredibly large chain, you may want to consider a hefty-obligation roller chain. If you are not confident which type of chain is best for your application, check with an sector professional.
Unlike other chains, roller chains are more productive from a measurement and bodyweight viewpoint. Whilst solution chains are useful in some circumstances, generate chains are much more effective for soiled work and slipping on tracks. They are typically utilised in building and manufacturing. There are other rewards to making use of a push chain. They are usually more powerful than belts, which is a large reward. So, if you are asking yourself which is better, here are them:
chain

Multi-strand roller chain

The multi-strand roller chains for generate chains industry is expected to develop at a CAGR of more than 20% throughout the forecast time period. Marketplace reports protect solution need, supply, and cost. The report handles the worldwide market such as company profiles, merchandise details, and contact information of important gamers. It also will take into account the revenue generated by diverse software places. The report consists of 159 pages of helpful details and knowledge. It is an crucial resource for anyone involved in travel chain producing.
The vital traits of multi-strand chains are their electricity ratings and allowable bearing area pressures. Electrical power rating is an critical attribute that decides the chain’s ability to transmit a certain load. Typically, multi-strand chains are rated in the range of twelve,000 watts for each strand. Nonetheless, their capabilities are constrained by hyperlink plate exhaustion, roller effect exhaustion, and use amongst pins and bushings.
Power Sequence chains are ideal for large-speed and large shock load apps. The chain is created to supply reputable electricity and endure the rigors of the oil and gas business. It uses higher-power steel and double-coated rolls. These chains arrive in various lengths and occur in two types: single-strand and multi-strand. It is best to seek the advice of a expert to find out which chain best fits your requirements.
The world-wide multi-strand roller chains industry is anticipated to expand at a CAGR of over 7% during the forecast period. From 2011 to 2019, the market is anticipated to develop by almost 6%. Even so, the outlook for this market place is not optimistic, with some firms enduring damaging expansion more than the previous year. Nonetheless, slowing worldwide financial progress and tightening COVID-19 rules are most likely to hinder the market place development.
Though requirements fluctuate by application, it need to be remembered that the load on a multi-strand roller chain need to not be better than 1/9 or 1/6 of the tensile toughness of the chain. If the load exceeds this threshold, the chainplates will exhaustion. This is the principal cause why roller chains are costly. Even so, this is not constantly the circumstance. Multi-strand roller chains are a great notion if you are searching for an affordable and dependable drive chain.

double chain

If you are searching for an industrial-grade push chain, you’ve got most likely regarded as a double chain. The chain meshes with the sprockets on either facet of the gears. It arrives in different variations, every single with its very own benefits and negatives. The CZPT duplex series has twice the power ability of normal SC duplex chains. This type of chain is typically ideal for new purposes. On the other hand, SC double chain chains are the most affordable but have less fat and electricity ability.
An additional choice is a triple travel chain. This variety of drive chain has an added row of plates and includes a few sprockets. Its distinctive layout lowers the excess weight and effect velocity of the timing chain. It is typically utilized in automotive applications. It is ideal for reduced to medium-load timing purposes. It is also accessible in acoustically optimized versions. A few-quarter inch pitch double chain chains are broadly employed in gasoline engine aids and timing drives.
chain

flat best chain

Large friction rubber is usually set up on the best or base of a flat top travel chain to boost its large friction floor and stop interference throughout aspect bend conveying. The chain plate can be tailored with thin rubber layer or thick elastic polyurethane rubber according to consumer demands. In addition to providing large friction, the flat leading chain also offers superb anti-slip qualities for glass bottles.
Premium metal flat prime chain with substantial high quality area end and superb wear resistance. They have a high level of noise reduction and can be employed in heavy duty conveying purposes. These chains are available in a selection of alloys such as stainless steel or aluminum. Some models are made to be very rugged and last longer. Aluminum and galvanized steel chains are well-known selections for these chains.
Flat Prime Travel Chain Conveyors are adaptable and arrive in an endless combination of configurations. Drives can be linked finish-to-end to kind long conveyor traces, although side-curved flat-prime chains are adaptable enough to handle tandem, serpentine or carousel configurations. Regular and weighty duty types are also offered. Flat best chains can be used in a lot of various purposes which includes food, beverages and other commodities.
Standard flat best chains are usually rectangular or L-shaped and made for use on straight conveyors. In some situations, space constraints may possibly demand a U-formed or rectangular conveyor line. For smoother conveying, facet-curved flat-prime chains can be employed. These chains are paired with standard rectangular chain plates and tall pins for substantial load potential. They come in various widths, including multi-strand chains.

China high quality Tsubaki Chain 24A-2 a Collection Limited Pitch Precision Duplex Roller Chains and Bush Chains with Link     wholesaler