for hyundai R55-7/R55-7A excavator track chain track link 81m6-51120(-2997)8m6-51121(2998-3289)81m6-51122(3290)Material40MnB,Website:http://www.mining-parts.net,35MnBFinishSmoothColorsBlack or yellowTechniqueForging castingSurface HardnessHRC50-56,deepth:4mm-10mmWarranty time2000 hourCertificationISO9001-9002FOB PriceFOB Xiamen USD 40-70/PairMOQ2 pieceDelivery TimeWithin 15-30 days after contract established3.Models List Reference:MODELDESCRIPTIONPITCHBERCO No.OEM No.PC60-3LINK(42L)12.3mm135KM906201-32-00131PC60-6/ PC75LINK(39L)14.3mm154KM1686/3041201-32-00011PC120-3LINK(43L) 14.3mm154KM965202-32-00010PC100/120-5LINK(42L)16.3mm175KM1262203-32-00101PC200-5/6LINK(45L)20.3mm190KM78220Y-32-00013LINK(49L)None Seal190KM782UNS/49PC200-3LINK(46L)18.3mm190KM1170206-32-00011LINK(46L)None Seal190KM1170UNSPC300-1/2LINK(47L)20.0mm203KM959/KM3628207-32-00050LINK(47L)None Seal203KM959UNS/47PC300-5LINK(47L)22.0mm203KM1617207-32-00101PC300-6LINK(48L)216KM2233207-32-00300PC400-1/3LINK(53L)22.3mm216KM973208-32-00040PC400-5LINK(49L)24.3mm216KM1402208-32-00101PC650LINK(47L)260.4KM596209-32-00022There are more model of track link as follow for your reference:NameSpecificationPitchTrack linkR200 50L171Track linkPC120-5 42L175Track linkSK100 43L171Track linkDH55 40L135Track linkSH120 44L171Track linkPC60-5 42L135Track linkPC60-6 38L154Track linkD50 49L175Track linkR55 �40L135Track linkPC200-5 45L190Track linkPC200-5 49L190Track linkHD700 48L190Track linkPC400-2 47L216Track linkPC300-6 45L216Track linkCATE320 45L190Track linkCATE320 46L190Track linkEX300-1 47L203Track linkEX200-1 � �48L175Track linkEX60 � �37L154Track linkEX100 � �43L171Track linkEX200-5 � �46L1903.More products for your choice:�4.our process workmaship of track link