OEM Leaf Springs for USA Trucks and Suspensions

DescriptionWhat Are Leaf Springs?Leaf springs stand as the most widely used elastic elements in automobile suspensions today. They consist of several alloy spring sheets with equal width but unequal length, forming an approximate equal-strength steel beam. This design lets them transmit all forces and moments between wheels and frames, ease impact loads from the road, enable vehicle guidance, and keep vehicles running normally. You can find them in suspensions for heavy duty trucks, light duty trucks, pick-ups, cars, and various trailers like skeletal, lowbed, flatbed, and oil tank trailers, as well as agricultural vehicles.Types of Leaf SpringsWONDEE offers a diverse range of leaf springs to meet different application needs. Here are the main categories: Conventional leaf springsParabolic leaf springsZ type air linkersTRA leaf springsTrailer leaf springs (including light duty trailer springs and boat trailer springs)Pickup leaf springsSemi trailer springsTruck springs (including heavy truck springs)Farming/agricultural trailer springsSprung drawbarBus springsBogie/boogie springsKey Quality & Technical FeaturesWONDEE leaf springs adhere to strict standards and use advanced processes to ensure performance and durability. Below is a detailed breakdown of their key features: Feature CategoryDetailsQC Management SystemImplements IATF 16949-2016 to maintain consistent quality control.Services Quality Management SystemFollows ISO 9001-2015 to deliver reliable customer service.Product Technical StandardsComplies with GB/T 19844-2018 and GT/T 1222-2007 for product safety and performance.WarrantyProvides a 12-month warranty starting from the shipping date.Quality Testing EquipmentUses Stiffness Testing Machine, Arc Height Sorting Machine, and Fatigue Testing Machine.Raw MaterialSources steel from the top 3 steel mills in China for high-quality base material.Flat Bar Cutting & Center Hole PunchingRelies on fully automatic CNC lines; center hole tolerance <±0.2 mm, cutting length tolerance <±2 mm.Leaf Spring Eye RollingUses automatic CNC machines with robot assistance; ensures perpendicularity and parallelism tolerance <1% x leaf width, eye diameter tolerance <±0.5 mm.Leaf Tapering/Parabolic RollingEmploys automatic CNC parabolic taper rolling machines; taper thickness allowance <±0.25 mm.Heat Treatment LinesUses large-scale CNC heating furnaces (temp difference ±5℃), special quenching equipment, and dedicated tempering lines.Camber Tolerance≤±6 mm, which exceeds the spring industry standard of ±7 mm.Fatigue Life>120,000 cycles, surpassing the industry standard of 100,000 cycles.HardnessRanges from 41HRC to 48HRC for optimal strength and flexibility.Shot PeeningUses a mix of new and used steel shots to boost fatigue life without surface microcracks.PaintingOffers normal painting and E-coating; E-coating provides >100 hours of salt spray resistance.Marks/StickersSupports custom client logos and designs free of charge.Other Inspection EquipmentIncludes Metallographic Microscope, Spectrophotometer, Carbon Furnace, and Hardness Tester.Comprehensive Product SpecificationsWONDEE leaf springs cover a wide range of parameters to fit various vehicle models and needs: SpecificationDetailsMaterials GradeSUP7, SUP9, SUP9A, SUP10, SUP11, SUP11A, SUP12, 60Si2Mn, 55CrMnA, 60CrMnBA, 50CrVA, 60Si2CrA, 61SiCr7, 55Cr3, 60CrB3, 51CrV4, 9260, 5155, 5160, 6150, 51B60, 9254Spring Width Range44.5~125 mmSpring Thickness6~50 mmInterchangeable BrandsMERCEDES BENZ, BPW, VOLVO, TOYOTA, HONDA, NISSAN, MAN, HOWO, SCANIA, RENAULT, DAF, ISUZU, IVECO, SISU, HYUNDA, TATRA, MAZ, SAF, ROR, FRUEHAUF, HINO, YORK, FUWA, CIMCColorsRed, shinning black, dark black, grey, blue, and other custom colors as required.Optional PartsCenter bolts, clamps, copper bushes, bi-metal bushes, steel rubber bushings, rubber bushes, nylon bushes, U-bolts, brackets, pins.PackageFumigated wooden pallets, steel pallets, or other options as required.Payment TermsTT, LC, DPLead TimeAbout 25~35 working daysMOQ60 pcsOversea Sales Volume14,000 tonsOverseas Market30 countries (Germany, France, Poland, Portugal, Russia, Finland, USA, Canada, Mexico, Thailand, Vietnam, Malaysia, Singapore, The Philippines, Indonesia, Brazil, Bolivia, Argentina, Ecuador, Chile, Peru, Guatemala, Panama, Egypt, South Africa, Nigeria, Tanzania)Overseas Clients91 Land Area30,000 square metersAnnual Output35,000 tonsNumber of Equipments200 setsNumber of Employees260 Number of Engineers10 Available CertificatesCOC, PVOC, CIQ, SONCAP, BV, C/O, FORM E, FORM AOEM Models for USA Trucks & SuspensionsWONDEE provides a wide range of OEM leaf spring models specifically designed for USA trucks and suspensions. These models fit brands like FORD, FREIGHTLINER, FRUEHAUF, HUTCHENS, INTERNATIONAL, MACK, NAVISTAR, REYCO. Below is a selection of key OEM numbers: S/NOEM No.S/NOEM No.S/NOEM No.S/NOEM No.146-11891346-1762555-12173750-299246-14061446-2202655-12193850-183346-11971546-12442755-12383955-1220446-1221646-14822855-12424055-144546-12401746-14942955-12624155-1246646-12421850-2393055-1304262-890746-12461955-0213155-1484362-968846-12802055-0353255-8944462-830946-13022155-1543355-9344562-8321046-14322255-0293459-428––1146-14342355-1203555-1219VT––1246-14762455-12163650-301––WONDEE TRA Series Leaf SpringsThe TRA series is a key line of leaf springs from WONDEE, including both parabolic and conventional types. Below are detailed specs for selected TRA models: S/NOEM NumberTypeNo. of LeafWeight (kg)Material Section (mm)1TRA2726Parabolic326.2720 X 762TRA2727Parabolic325.8320 X 763TRA2728Parabolic325.5920 X 764TRA3343Conventional1069.0211 X 1005TRA2705Conventional744.8313 X 756TRA2260Conventional848.613 X 757TRA2256Conventional741.2113 X 758TRA3319Conventional953.1713 X 759TRA2297Conventional951.7113 X 7510TRA2270Conventional849.8213 X 751183-115Conventional1454.610 X 7512TRA2752Parabolic225.6824 X 7613TRA2754Parabolic225.3524 X 7614TRA2740Parabolic331.0324 X 7615TRA2741Parabolic330.824 X 7616TRA021Parabolic118.535 X 7617TRA023Parabolic118.5835 X 7618TRA699Parabolic429.8620 X 7619S1-52Parabolic434.5620 X 7620TRA693Parabolic32520 X 7621TRA038Parabolic122.3140 X 7622TRA035Parabolic118.0435 X 762355-896Conventional868.811 X 10024TRA3340Parabolic329.620×7625TRA2291Parabolic327.2720×762655-1192Parabolic438.6818,8×1002759-400Parabolic373.2622×1002862-830Parabolic450.48,18×9029M/C 3 1/2″x1/2″Conventional9–13*90-930M/C 4 x 1/2″Conventional9–13*100-93146-220Parabolic3–18(8)*100-43246-1280Parabolic2–20(14)(8)*100-53355-067Parabolic1–33*90-134ZZ03Parabolic––38*90-13555-430Parabolic––18(6)*100-53616710-01Parabolic2–35*76-237TRA2160Conventional848.313 X 7538TRA696Conventional951.0313X 753955-144Parabolic548.788,10,21×10040TRA693Parabolic32620×7641TRA1492Parabolic33020×9042TRA3341Parabolic326.220×764362-147Conventional10167102*20，2544TRA073Parabolic1––4555-930Parabolic5––Notes on TRA SeriesWONDEE offers other unlisted TRA leaf springs to cover more specific application needs.Beyond the TRA series, WONDEE also provides all other leaf spring classifications mentioned earlier, ensuring full compatibility with different vehicle types.