Complete 3-Leaf, 4-Leaf, 5-Leaf & 6-Leaf Trailer Leaf Spring Specification Matrix (705 lb to 5,000 lb+)
As a direct IATF 16949:2016 certified trailer leaf spring manufacturer producing 20,000+ tons annually, XIANGZEWO supplies both North American imperial capacities (750 lb, 1,000 lb, 1,500 lb, 1,750 lb, 2,000 lb, 3,000 lb, 3,500 lb, 5,000 lb) and metric export ratings (320 kg / 705 lb, 415 kg / 916 lb, 426 kg / 940 lb, 537 kg / 1,184 lb, 642 kg / 1,415 lb, and 1,040 kg / 2,293 lb):
| Leaf Count & Duty Class | Single Spring Load Rating (lbs / kg) | Gross Axle Capacity (Pair) | Width × Leaf Thickness | Unloaded Eye-to-Eye / Free Length | Free Arch Height | Steel Grade & Coating |
|---|---|---|---|---|---|---|
| 3-Leaf Light Utility | 705 lb – 750 lb (320–340 kg) | 1,400–1,500 lb Axle | 1-3/4" (44.5 mm) × 6.0 mm | 20-3/8" to 25-1/4" (518–641 mm) | 3-1/4" (82 mm) | 60Si2Mn / SUP9 + KTL E-Coat |
| 3-Leaf Medium Utility | 916 lb – 1,000 lb (415–454 kg) | 1,800–2,000 lb Axle | 1-3/4" (44.5 mm) × 6.5 mm | 23-1/8" to 25-1/4" (587–641 mm) | 3-1/4" (82 mm) | 60Si2Mn / SUP9 + KTL E-Coat |
| 4-Leaf Standard Utility / Boat | 940 lb – 1,250 lb (426–567 kg) | 2,000–2,500 lb Axle | 1-3/4" (44.5 mm) × 6.5–7.0 mm | 24.00" to 25-1/4" (610–641 mm) | 3.00"–3-1/2" (76–89 mm) | 60Si2Mn / SUP9 + KTL E-Coat |
| 4-Leaf Medium-Duty Trailer | 1,500 lb – 1,750 lb (680–794 kg) | 3,000–3,500 lb Axle | 1-3/4" (44.5 mm) × 8.0 mm (0.32") | 25-1/4" (641 mm) Double Eye | 3.00" (76 mm) | SUP9 / SAE 5160H (1.75" 4-Leaf Spec) |
| 5-Leaf Heavy Utility / RV | 1,184 lb – 2,000 lb (537–907 kg) | 2,400–4,000 lb Axle | 1-3/4" (44.5 mm) × 7.0–8.0 mm | 25-1/4" to 26-5/8" (641–676 mm) | 3.00"–3-1/2" (76–89 mm) | SUP9 / 60Si2Mn + Nylon Pads |
| 5-Leaf Commercial Tandem | 2,293 lb – 2,500 lb (1,040–1,134 kg) | 4,500–5,200 lb Axle | 1-3/4" or 2.00" (50.8 mm) × 8.5 mm | 25-1/4" to 26.00" (641–660 mm) | 3.00"–3-1/4" (76–82 mm) | SUP9 / SUP9A + Bimetal Bush |
| 6-Leaf Heavy Equipment | 1,415 lb – 3,000 lb (642–1,360 kg) | 3,000–6,000 lb Axle | 2.00" (50.8 mm) × 8.0–9.0 mm | 25-1/4" to 27.00" (641–686 mm) | 3-1/4"–3-1/2" (82–89 mm) | SUP9 / SUP9A + KTL Coating |
| 6-Leaf / 7-Leaf Slipper | 3,500 lb – 5,000 lb (1,588–2,268 kg) | 7,000–10,000 lb Axle | 2.00" or 2-1/2" (63.5 mm) × 9.5–10 mm | 26-1/2" to 30-1/2" (673–775 mm) | 3-1/2"–4.00" (89–102 mm) | SUP9A / 50CrVA |
| 3-Leaf Hutchens Semi-Trailer | 11,000 lb – 12,500 lb (5,000–5,670 kg) | 22,500–25,000 lb Axle | 3.00" (76.2 mm) × 20–24 mm | 45.6"–46.0" (1,159–1,168 mm) | 146–158.8 mm | SUP9 (TRA-2726 / TRA-2740) |
How Number of Leaves (3-Leaf vs. 4-Leaf vs. 5-Leaf vs. 6-Leaf) Governs Trailer Ride & Stability
A leaf spring is composed of one or more long steel plates called leaves. When selecting replacement or custom trailer leaf springs, procurement engineers must balance three mechanical factors regarding the number of leaves:
- Load Sharing vs. Single-Blade Thickness: For a fixed axle capacity (e.g., 1,500 lb or 3,000 lb per spring), a 5-leaf or 6-leaf pack uses thinner individual blades than a 3-leaf pack, lowering peak surface bending stress and providing progressive interleaf damping over rough roads.
- 3-Leaf Parabolic High-Arch Trailer Springs: In heavy commercial semi-trailers (such as TRA-2726, TRA-2728, and TRA-2740), 3 thick SUP9 blades (76×20 mm or 76×24 mm) deliver 11,000+ lbs of load capacity while saving 18 kg per axle compared to 8-leaf packs (TRA-2732 / TRA-2260).
- Marine & Boat Trailer Anti-Corrosion Protection: Boat and utility trailers submerged in brackish water require our KTL Electrophoretic Coated Trailer Leaf Springs (>500 hours salt-spray rated) with nylon anti-squeak pads and 9/16" ID bushing eyes.
5. Verified Factory Specification Index: Commercial Pages, Suspension Architectures & 30 OEM Models
For procurement engineers comparing suspension architectures across our China Leaf Spring Manufacturer facility, XIANGZEWO (Zhengzhou Jingrui) provides full technical documentation across our Parabolic Leaf Spring Services hub, Custom Leaf Springs engineering portal, OEM Leaf Spring Catalog Shop, Leaf Spring Manufacturing FAQ, Technical Blog, and 24-Hour OEM Quotation Desk. Our specialized production lines cover Parabolic Tapered Leaf Springs, Conventional Multi-Leaf Springs, Long Taper Leaf Springs, Z-Leaf Air Suspension Springs, and Agricultural Equipment Leaf Springs.
Complete XIANGZEWO Leaf Spring Engineering Guides, Category Hubs & OEM Part Number Directory
Explore our direct IATF 16949:2016 factory technical guides, suspension architecture comparisons, and OEM replacement specification pages (2-hop direct engineering index):
1. Core Suspension Hubs & Custom Engineering Services
China Leaf Spring Manufacturer Home |
All Heavy-Duty Leaf Springs |
Commercial Truck Leaf Springs |
Utility & Semi-Trailer Leaf Springs |
Custom Leaf Springs by Drawing |
Parabolic Leaf Spring Services & Testing |
Parabolic Tapered Springs |
Multi-Leaf Springs |
Long Taper Springs |
Z-Leaf Air Suspension Springs |
Agricultural Leaf Springs |
OEM Catalog Shop |
About XIANGZEWO Factory |
Manufacturing FAQ |
Technical Blog |
Request a 24h OEM Quote
2. Truck & Trailer Brand Category Hubs
Isuzu Leaf Springs |
Scania Leaf Springs |
Mitsubishi Fuso & Canter Leaf Springs |
BPW Trailer & Bogie Leaf Springs |
Hutchens / American TRA Trailer Springs |
Semi-Trailer Bogie & Germany-Type Springs |
Air Link Trailing Arm Springs |
Air Beam Suspension Springs |
Ford Truck Leaf Springs |
Freightliner Leaf Springs |
International Navistar Leaf Springs |
Nissan UD Leaf Springs |
Toyota & Hino Leaf Springs |
Light-Duty & Export Truck Leaf Springs |
Volvo Truck Springs |
MAN Truck Springs |
Mercedes-Benz Truck Springs |
Hendrickson Suspension Springs |
Mack Truck Springs |
Iveco Truck Springs |
Kamaz Truck Springs |
GAZ Light Truck Springs |
Hyundai Truck Springs |
Volkswagen Commercial Springs |
Specialty OEM Leaf Springs
3. Direct OEM Part Number Specification Pages (30 Verified Models)
Trailer & Bogie Series:
Hutchens TRA-2726 (3L 76×20mm) |
Hutchens TRA-2727 Parabolic |
Hutchens TRA-2728 Low-Arch |
Hutchens TRA-2732 (8-Leaf) |
Hutchens TRA-2740 (3L 76×24mm) |
Reyco TRA-2260 (8-Leaf) |
Fruehauf TRA-699 (4-Leaf) |
Fruehauf TRA-021 Mono-Leaf (50CrVA) |
11436 Semi-Trailer Spring (9L 76×14mm) |
T410012 Germany-Type Trailer Spring (11L 100×12mm) |
BPW 24T Bogie Spring (18L 90×13/17mm) |
1.75" 4-Leaf Mobile Home & Utility Trailer Spring (750lb–1750lb) |
1.75" Tapered Mono-Leaf RV & Boat Trailer Spring |
80×20×1600mm 12-Leaf Heavy Trailer Pack
Commercial Truck & Air Suspension Series:
Isuzu 1-51130-961-0 Parabolic/Multi-Leaf |
Scania 1421060 Air Suspension Spring (100×47/45mm) |
BPW 880368 Air Link Spring (100×38mm 51CrV4) |
Forged Z-Type Air Beam Trailing Arm |
Mitsubishi MC413899/F, L200 MR448146 & Canter MB294519 |
Nissan UD 54010-Z3007-FA Parabolic (90×12mm 9L) |
Ford 43-698 Front Truck Pack (9L 100mm) |
Ford 43-1199 (431199) Truck Pack (4L 63mm) |
Freightliner 46-1189 Class 8 Pack (13L 76mm) |
International 55-031 Navistar Pack (13L 76mm) |
HPF5 Light Truck Spring (6L 70×11/13mm) |
IE2F P60/10/6V Light Commercial Spring |
TC P60/8/2 Light-Duty 3+2 Leaf Spring |
NDT P60/8/2 Front Parabolic Light Truck Spring |
3" Variable-Section Heavy Truck Parabolic Spring |
6–56mm Custom OEM Truck & Bus Leaf Springs (MAN/Volvo/Hino/YUTONG)
4. Technical Calculators, Load Charts & Industry Guides
Types of Leaf Springs: Cantilever, Semi-Elliptical & Full Elliptical Guide |
Interactive Leaf Spring Rate & Load Capacity Calculator |
110+ OEM Truck & Trailer Leaf Spring Cross-Reference Chart |
Parabolic Leaf Spring Services vs. Semi-Elliptic Multi-Leaf Guide |
3-Leaf to 6-Leaf Trailer Leaf Spring Load Chart (705lb–5000lb) |
Custom Truck Leaf Springs |
Agricultural Trailer Leaf Springs |
Automotive Aftermarket Leaf Springs |
Oilfield & Frac Trailer Leaf Springs |
Mining Dump Truck Leaf Springs |
Military-Wrap Tactical Leaf Springs |
Construction Mixer & Lowboy Leaf Springs |
Engineering Guides Archive |
Custom Industry Archive
Additional OEM Suspension Configurations: For specialized heavy-duty axle and air-suspension applications, compare our 24T Heavy-Duty Bogie Multi-Leaf Suspension Spring Pack, Heavy-Duty Trailer Air Beam & Trailing Arm Leaf Spring engineered with shot-peened SUP9A and 50CrVA alloy steel.
Frequently Asked Engineering & OEM Procurement Questions (FAQ)
When selecting leaf springs, what should you keep in mind regarding the number of leaves?
More leaves (e.g., 4-leaf, 5-leaf, or 6-leaf packs) distribute bending stress across multiple graduated plates and increase interleaf damping for heavy loads (1,500 lb to 5,000 lb per spring), while fewer tapered leaves (1-leaf to 3-leaf parabolic springs) reduce unsprung weight and deliver a smoother ride.
Do you manufacture metric-rated trailer leaf springs such as 3-leaf 705 lb, 4-leaf 940 lb, 5-leaf 1184 lb, 5-leaf 2293 lb, and 6-leaf 1415 lb?
Yes. XIANGZEWO manufactures both US standard ratings (750 lb, 1000 lb, 1500 lb, 1750 lb, 3000 lb, 5000 lb) and metric export ratings including 320 kg (705 lb), 415 kg (916 lb), 426 kg (940 lb), 537 kg (1184 lb), 642 kg (1415 lb), and 1040 kg (2293 lb) in 60Si2Mn and SUP9 steel with KTL electrophoretic coating.
