3-Axle Container Skeleton Semi-Trailer
3-axle container skeleton semi-trailer for sale with heavy-duty frame, reliable axle system, and WABCO braking. Perfect for 20ft and 40ft container transport.
WApp: +86 13455277771
Email: nick@cjstrailer.com
contact :Nick Zhu
Product advantage
Introduction
In the fast-paced world of global logistics, intermodal container transport is the backbone of international trade. The vehicle that makes this seamless movement possible — from ship to rail to road — is the container skeleton semi-trailer. Also known as a container chassis, skeletal trailer, or intermodal chassis, this specialized trailer is designed to carry standard shipping containers over public highways.
Among the various configurations available, the 3-axle container skeleton semi-trailer stands out as the most popular and versatile choice worldwide. It offers the perfect balance between payload capacity, legal weight compliance, and maneuverability.
Whether you are a fleet owner, a logistics manager, a port operator, or an independent truck driver serving drayage operations, understanding the 3-axle container skeleton semi-trailer is essential for efficient, profitable, and compliant intermodal transport.
This comprehensive guide covers everything: what it is, how it works, main applications, industry pain points solved, competitive comparisons, and additional critical considerations — all backed by detailed specification tables.
Container Skeleton Semi Trailer Pros and Cons
Container skeleton semi trailer
1. What Is a 3-Axle Container Skeleton Semi-Trailer?
A container skeleton semi-trailer (also called a container chassis or intermodal chassis) is a type of semi-trailer consisting of nothing more than a frame (the “skeleton”), axles, suspension, brakes, lights, and twist locks. It has no sides, no roof, and no floor — only the structural members needed to support a shipping container at its four corners.
The 3-axle configuration means the trailer has three axles at the rear, typically arranged as a tridem (three axles grouped together) or spread tandem (two axles at the rear plus a third axle positioned forward). Three axles provide higher legal payload capacity than 2-axle chassis while remaining more maneuverable and cost-effective than 4-axle units.
Key Characteristics:
- Skeleton design: Minimalist frame reduces weight and cost.
- Twist locks: Four locking mechanisms (front and rear) that secure the container to the chassis.
- ISO container compatibility: Fits 20ft, 40ft, and sometimes 45ft containers (adjustable or fixed).
- No cargo floor: The container itself provides the floor and walls.
- Sliding or fixed chassis: Sliding chassis can extend/retract to fit different container lengths.
Key Components of a 3-Axle Container Skeleton Semi-Trailer:
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| Component | Function |
|---|---|
| Main frame (I-beams) | Structural backbone, typically high-tensile steel |
| Twist locks (4 or 8) | Locking mechanisms that secure container corners |
| Axles (3) | Tridem or spread configuration |
| Suspension | Mechanical spring or air-ride |
| Brake system | ABS/EBS with automatic slack adjusters |
| Landing gear | Retractable legs for when disconnected from tractor |
| Rear underride guard | Safety device preventing cars from sliding under |
| Side underride guards (optional) | Required in some jurisdictions |
| Lighting system | LED clearance, brake, turn, and marker lights |
| Mud flaps | Prevent spray and debris |
2. Detailed Specification Tables
Below are comprehensive specification tables for two common 3-axle container skeleton semi-trailer configurations: a fixed-length chassis (North American standard) and a sliding/expandable chassis (global standard).
Table 1: Fixed-Length 3-Axle Container Skeleton Semi-Trailer (North America)
| Specification Parameter | Value / Range | Remarks |
|---|---|---|
| Overall Length | 40 – 45 ft (12.2 – 13.7 m) | Fixed for 40ft containers |
| Chassis Length (Load Area) | 40 ft (12.2 m) or 45 ft (13.7 m) | For 40ft or 45ft containers |
| Overall Width | 8.5 ft (2.6 m) | Legal maximum in US/Canada |
| Frame Material | High-tensile steel (80,000 – 100,000 psi yield) | Or aluminum for weight reduction |
| Tare Weight (Empty) | 8,500 – 10,500 lbs (3,850 – 4,760 kg) | Steel chassis; aluminum is lighter |
| Payload Capacity | 55,000 – 60,000 lbs (24,900 – 27,200 kg) | Dependent on tractor and permits |
| Gross Vehicle Weight (GVW) | 80,000 lbs (36,287 kg) standard | Up to 105,500 lbs with permits |
| Number of Axles | 3 | Tridem (all grouped) |
| Axle Spacing | 49 inches (1.24 m) between axles | Standard tridem spacing |
| Axle Type | Mechanical spring (standard) or air-ride | Air-ride optional for fragile cargo |
| Tire Size | 11R22.5 or 295/75R22.5 | 8 tires (dual on each axle) or super singles |
| Suspension Type | Spring or air-ride | Spring: 23,000 lb capacity per axle |
| Brake System | ABS with automatic slack adjusters | Mandatory in US since 1998 |
| Twist Locks | 4 fixed (front and rear) | Manual or automatic (push-button) |
| Container Compatibility | 20ft, 40ft, 45ft (fixed length only fits one size) | For multi-size, use sliding chassis |
| Landing Gear | 2-speed crank (manual) | 35,000 lb static capacity |
| Kingpin | 2-inch (50.8 mm) standard | Jost or Holland brand |
| Kingpin Location | 36 inches from front (standard) | For 40ft container |
| Lighting | Full LED, DOT compliant | Sealed waterproof connectors |
| Rear Underride Guard | DOT compliant (height ≤22 inches) | 25,000 lb strength rating |
Table 2: Sliding (Expandable) 3-Axle Container Skeleton Semi-Trailer (International)
| Specification Parameter | Value / Range | Remarks |
|---|---|---|
| Overall Length (Retracted) | 20 – 23 ft (6.1 – 7.0 m) | For 20ft container |
| Overall Length (Extended) | 40 – 45 ft (12.2 – 13.7 m) | For 40ft or 45ft container |
| Chassis Length Range | 20 – 53 ft (6.1 – 16.2 m) adjustable | Some models handle 53ft containers |
| Overall Width | 8.5 ft (2.6 m) or 2.55 m (EU) | Region specific |
| Tare Weight (Empty) | 10,000 – 13,500 lbs (4,535 – 6,124 kg) | Heavier due to sliding mechanism |
| Payload Capacity | 50,000 – 55,000 lbs (22,680 – 24,950 kg) | Reduced due to higher tare weight |
| Gross Vehicle Weight (GVW) | 80,000 lbs (36,287 kg) | US standard |
| Number of Axles | 3 | Tridem or spread |
| Axle Type | Air-ride (preferred) | Self-leveling for different loads |
| Tire Size | 295/75R22.5 or 385/65R22.5 super single | Super singles save weight |
| Sliding Mechanism | Hydraulic or mechanical pin-lock | Hydraulic is faster but heavier |
| Twist Locks | 8 total (4 front, 4 rear on sliding section) | Accommodates different container lengths |
| Container Compatibility | 20ft, 40ft, 45ft, sometimes 53ft | Single chassis for multiple sizes |
| Suspension | Air-ride with liftable axles | Axle lift for empty returns |
| Brake System | EBS (Electronic Braking System) | Mandatory in EU for 3+ axles |
| Lighting | Full LED with ABS/EBS integration | Smart lighting systems |
| Market | Global (Europe, Asia, Middle East, Australia) | Less common in US |
3. How Does a 3-Axle Container Skeleton Semi-Trailer Work?
Understanding the working principle of a container chassis is essential for efficient drayage operations. Here is a step-by-step breakdown.
Step 1: Positioning and Preparation
- The tractor backs the empty chassis into a container yard, port terminal, or rail ramp.
- The landing gear is lowered to support the front of the chassis when disconnected.
- Twist locks are opened (rotated 90 degrees to the unlocked position).
Step 2: Container Loading
- A container crane, reach stacker, or top loader picks up a shipping container (20ft, 40ft, or 45ft).
- The container is lowered onto the chassis so that its four corner castings align with the chassis twist locks.
- For sliding chassis: the rear section is extended or retracted to match the container length before loading.
Step 3: Locking the Container
- Once the container rests on the chassis, twist locks are rotated back to the locked position (90 degrees).
- Manual twist locks: A worker rotates each lock by hand (typically 4 locks for 20ft, 8 for 40ft if using all).
- Automatic twist locks: The locks engage automatically when the container is lowered; some are released by a push button from the tractor cab.
- Locked twist locks prevent the container from lifting, sliding forward/backward, or tipping sideways.
Step 4: Connecting the Tractor
- The tractor backs under the chassis kingpin.
- The fifth wheel locks onto the kingpin.
- Air lines and electrical cables are connected (red = emergency, blue = service, electrical = lights/ABS).
- Landing gear is raised fully.
Step 5: Transport
- The loaded container is hauled to its destination (distribution center, rail ramp, port, or customer facility).
- Air suspension (if equipped) self-levels to maintain ride height regardless of load.
- The driver must ensure the container is properly secured and within legal weight limits per axle.
Step 6: Unloading
- At destination, the process is reversed:
- Lower landing gear.
- Disconnect air and electrical lines.
- Release fifth wheel.
- Pull tractor forward.
- Unlock twist locks.
- Crane or reach stacker lifts container off chassis.
- The empty chassis is then moved to the next pickup location.
4. Main Applications of the 3-Axle Container Skeleton Semi-Trailer
The 3-axle container chassis is the workhorse of intermodal transport. Here are its primary applications:
A. Port Drayage (Ship to Warehouse)
- Moving containers from port terminals to nearby warehouses, distribution centers, or rail ramps.
- Typical distance: 5 – 50 miles (short haul)
- Key requirement: High maneuverability in congested port areas.
- Example: A 40ft container of electronics from the Port of Long Beach to a warehouse in Los Angeles.
B. Rail Ramp to Customer (Intermodal)
- Transporting containers that arrived by train to final delivery points.
- Typical distance: 50 – 200 miles (regional haul)
- Key requirement: Legal weight compliance at weigh stations.
- Example: A 20ft container of automotive parts from a rail terminal in Chicago to a factory in Detroit.
C. Domestic Container Transport (Truckload)
- Moving domestic containers (e.g., 53ft containers in North America) between shippers and receivers.
- Typical distance: 100 – 500 miles
- Key requirement: Sliding chassis for multiple container sizes.
D. Empty Container Repositioning
- Moving empty containers from areas of surplus to areas of demand (e.g., inland to port).
- Key requirement: Lightweight chassis to maximize fuel efficiency when empty.
E. Transloading Operations
- Containers are dropped at a transload facility where goods are transferred to/from other trailers.
- Key requirement: Frequent dropping and hooking (robust landing gear and twist locks).
F. Cross-Border Transport (US-Mexico, Canada-US, EU)
- Containers move across international borders with customs seals intact.
- Key requirement: Compliance with multiple jurisdictions (lighting, underride guards, weight limits).
5. Industry Pain Points Solved by the 3-Axle Container Skeleton Semi-Trailer
| Problem | How a 3-Axle Container Skeleton Trailer Solves It |
|---|---|
| Heavy container weights exceeding 2-axle capacity | Three axles provide 60,000+ lbs legal payload vs. 40,000 lbs for 2-axle chassis. |
| Limited availability of different chassis sizes | Sliding chassis handles 20ft, 40ft, and 45ft containers with one trailer. |
| Cost of maintaining a mixed fleet | One 3-axle sliding chassis replaces multiple fixed-length chassis. |
| Container shifting during transport | Twist locks positively lock container corners — no strap or chain needed. |
| Time wasted at terminals | Automatic twist locks reduce container pickup/drop time from 10 minutes to 2 minutes. |
| Legal weight violations | Tridem axle configuration distributes weight to meet bridge formulas (typically 17,000 – 20,000 lbs per axle). |
| Damage to cargo from rough roads | Air-ride suspension (optional) cushions the container, reducing product damage. |
| Empty return fuel waste | Liftable axles (optional) raise unloaded axles, reducing tire wear and fuel consumption by 8–12%. |
| Theft and pilferage | Container doors can be sealed with high-security bolt seals; the skeleton design allows visual inspection of seals without opening. |
6. Competitive Analysis: 3-Axle Container Skeleton vs. Other Trailer Types
Many operators compare container chassis to dry vans or flatbeds. Here is a detailed comparison.
Table 3: 3-Axle Container Skeleton vs. Competitors
| Feature | 3-Axle Container Skeleton | Dry Van (Box Trailer) | Flatbed Trailer | Curtain-Sided Trailer |
|---|---|---|---|---|
| Primary Cargo | ISO shipping containers | Palletized freight | Machinery, steel, lumber | Mixed pallets |
| Cargo Protection | Container provides protection (container not included) | Full weather/security protection | None | Weather protection only |
| Loading Method | Crane or reach stacker | Dock door (forklift) | Crane or forklift from top/sides | Side or rear forklift |
| Turnaround Time (Load/Unload) | 5 – 15 minutes (crane dependent) | 30 – 90 minutes (dock dependent) | 20 – 40 minutes | 15 – 30 minutes |
| Tare Weight (Empty) | 8,500 – 10,500 lbs | 10,000 – 14,000 lbs | 7,000 – 9,000 lbs | 9,000 – 11,000 lbs |
| Payload Capacity (80k GVW) | 55,000 – 60,000 lbs | 45,000 – 50,000 lbs | 55,000 – 60,000 lbs | 50,000 – 55,000 lbs |
| Initial Cost (New, 2025) | $25,000 – $45,000 | $35,000 – $55,000 | $25,000 – $40,000 | $40,000 – $60,000 |
| Typical Lifespan | 15 – 25 years | 12 – 18 years | 20 – 30 years | 12 – 18 years |
| Best For | Intermodal, drayage, ports | Retail, LTL, dry freight | Heavy, oversized cargo | Mixed deliveries |
| Container Required? | Yes (rent or own container) | No | No | No |
| Return Load Flexibility | Low (must be container) | High | High | High |
Container Skeleton Chassis Axle Configuration Comparison
| Axle Configuration | Typical Payload | Maneuverability | Cost | Best Use Case |
|---|---|---|---|---|
| 2 Axle (Tandem) | 40,000 – 45,000 lbs | Excellent | $18,000 – $28,000 | Light containers, short haul |
| 3 Axle (Tridem) | 55,000 – 60,000 lbs | Good | $25,000 – $45,000 | Standard drayage, most common |
| 3 Axle (Spread) | 55,000 – 60,000 lbs | Fair (longer wheelbase) | $28,000 – $48,000 | Heavy loads needing bridge formula compliance |
| 4 Axle (Tridem + lift) | 65,000 – 70,000 lbs | Poor | $35,000 – $60,000 | Oversize/heavy permits only |
Key Takeaway: Choose a 3-axle tridem container skeleton for standard drayage operations. Choose a spread axle configuration if you frequently haul heavy containers near legal limits and need better weight distribution. Choose a sliding chassis if you handle multiple container sizes (20ft, 40ft, 45ft).
Leading Manufacturers (Global)
| Manufacturer | Region | Known For | Price Range (New) |
|---|---|---|---|
| Hyundai Translead (USA) | North America | Durable, widespread parts support | $28,000 – $42,000 |
| Wabash National (USA) | North America | Lightweight aluminum options | $30,000 – $45,000 |
| Utility Trailer (USA) | North America | Corrosion-resistant galvanized | $32,000 – $48,000 |
| Cheetah Chassis (USA) | North America | Sliding chassis specialist | $35,000 – $55,000 |
| Schmitz Cargobull (EU) | Europe | High-tech, EBS, air suspension | €30,000 – €50,000 |
| Kögel (Germany) | Europe | Lightweight, fuel-efficient | €28,000 – €45,000 |
| CIMC (China) | Global | Affordable, high volume | $18,000 – $30,000 |
7. How to Maintain a 3-Axle Container Skeleton Semi-Trailer
Container chassis operate in harsh environments — salt air at ports, rough roads, and frequent coupling/uncoupling. Maintenance is critical for safety and longevity.
Table 4: Maintenance Schedule for 3-Axle Container Skeleton
| Frequency | Task | Details / Tool Needed |
|---|---|---|
| Daily (pre-trip) | Inspect twist locks (function, wear); check tire pressure (100–110 psi); test all lights; check brake function; inspect frame for cracks | Flashlight, tire gauge, 12V tester |
| Weekly | Grease all suspension fittings (8–12 points); lubricate landing gear; inspect kingpin for wear; check mud flaps | Lithium grease gun, kingpin gauge |
| Monthly | Torque wheel nuts (450–500 lb-ft); inspect brake linings (min 1/4 inch); test ABS fault codes; inspect air lines for chafing | Torque wrench, brake gauge, ABS scanner |
| Quarterly | Inspect all welds (especially around twist lock mounts and fifth wheel plate); check slider mechanism (if equipped); inspect underride guards for damage | Flashlight, pry bar, weld gauge |
| Annually | Repack wheel bearings; replace air dryer cartridge; perform DOT annual inspection; load test landing gear (35,000 lbs static) | Bearing packer, hydraulic jack, pressure gauge |
| Every 2 years | NDT of frame critical points (kingpin area, twist lock mounts); replace all air brake diaphragms; recertify if required by jurisdiction | Mag-particle kit, brake tools |
Critical Maintenance Points for Container Chassis:
- Twist locks: These are the single most critical safety component. Inspect daily for cracks, wear, or sticking. A failed twist lock can cause a container to fall off the chassis.
- Slider mechanism (if equipped): Sliding chassis have pins, rails, or hydraulic systems. Clean rails monthly. Lubricate pins. Check for bent rails.
- Frame cracks: Container chassis experience torsion stress (twisting) when loaded. Inspect the main I-beams near the kingpin and rear axles for hairline cracks.
- Landing gear: Frequent dropping and hooking wears gears. Lubricate monthly. Check for bent legs.
8. How to Ensure Safety Performance
Safety is paramount when hauling 60,000 lb containers at highway speeds.
Pre-Operation Safety Checklist
| Item | Check |
|---|---|
| Twist locks | All 4 (or 8) locks fully engaged and locked. Visual verification required before moving. |
| Container condition | No major dents, corrosion, or door damage. Corner castings undamaged. |
| Tires | No cuts, bulges, or uneven wear. Proper inflation (100–110 psi). |
| Brakes | Test at 5 mph. Trailer brakes must lock before tractor brakes. |
| Lights | All clearance lights (top and side), brake lights, turn signals, and marker lights functional. |
| Frame | No visible cracks or excessive rust. |
| Landing gear | Fully raised and locked. |
| Kingpin | No excessive wear (gauge check). |
| Underride guards | Securely mounted, not bent. |
During Transport Safety
- Speed limits: 55–65 mph typical for loaded chassis. Reduce speed on curves — container center of gravity is high.
- Crosswinds: Empty or lightly loaded containers are vulnerable to crosswinds. Reduce speed in high winds.
- Following distance: Triple normal following distance. A container chassis with a heavy container requires longer stopping distance.
- Bridge clearance: Know your total height (chassis height + container height). Standard 40ft container is 8.5 ft tall. Total typically 13.5 – 14 ft — beware of 13.6 ft bridges.
Twist Lock Safety (Critical!)
- NEVER move a container chassis with unlocked twist locks. Containers have fallen off at highway speeds, causing fatalities.
- ALWAYS visually inspect all twist locks after loading. Automatic twist locks can fail to engage.
- Use a “twist lock indicator” — some chassis have colored flags or sensors showing locked/unlocked status.
Annual Legal Inspection (DOT / CVSA / MOT)
For container skeleton trailers, inspectors focus on:
- Twist lock condition and operation (failure = out of service)
- Frame cracks (especially near kingpin and suspension mounts)
- Brake balance and lining thickness
- Underride guard condition
- Lighting and reflectivity
9. Additional Important Considerations
Container Chassis Types by Market
| Market | Dominant Chassis Type | Typical Container Sizes | Key Regulations |
|---|---|---|---|
| United States | Fixed-length tridem (steel) | 20ft, 40ft, 45ft, 53ft | FMCSA, DOT, state weight limits |
| Canada | Tridem or spread axle | 20ft, 40ft, 48ft, 53ft | Provincial weight limits (higher than US) |
| European Union | Sliding air-ride | 20ft, 40ft, 45ft | EU weights (40-44 tons GVW), EBS required |
| Australia | Heavy-duty tridem or quad | 20ft, 40ft (road trains) | Higher GVW (up to 68 tons), B-double compatible |
| Middle East / Asia | Sliding or fixed (CIMC dominant) | 20ft, 40ft | Varied; often less strict enforcement |
Fixed vs. Sliding Chassis: Which to Choose?
| Factor | Fixed Chassis | Sliding Chassis |
|---|---|---|
| Tare weight | Lighter (8,500–10,500 lbs) | Heavier (10,000–13,500 lbs) |
| Initial cost | Lower ($25,000–$35,000) | Higher ($35,000–$55,000) |
| Container flexibility | One size only | Multiple sizes (20ft, 40ft, 45ft) |
| Maintenance complexity | Low | Higher (slider mechanism) |
| Best for | Dedicated route with one container size | Mixed fleet, multiple customers |
| Payload reduction vs. fixed | Baseline | 1,500–3,000 lbs less payload |
Recommendation: If you handle more than 80% of loads in one container size, buy fixed chassis for that size and a few sliding chassis for the remainder. If you handle varied sizes daily, buy all sliding chassis.
Twist Lock Types
| Type | Operation | Pros | Cons |
|---|---|---|---|
| Manual (rotating) | Hand-operated lever | Reliable, low cost | Requires driver to exit cab |
| Semi-automatic | Springs engage automatically; manual release | Faster loading | Still requires manual release |
| Full automatic | Push-button from cab | Fastest, driver stays in cab | Expensive, more failure points |
| Flush-mount | Recessed into frame | Lower profile, less snagging | Harder to inspect |
Corrosion Prevention
Container chassis spend significant time at ports (salt air) and on winter roads (salt brine). Corrosion is the #1 cause of chassis retirement.
- Galvanized chassis: More expensive but lasts 2–3x longer than painted.
- Aluminum chassis: Lightweight and corrosion-resistant but more expensive and less impact-resistant.
- Cathodic protection (sacrificial anodes): Rare on chassis but available.
- Regular washing: Wash chassis after every port visit, especially underside.
Resale Value Factors
- Full maintenance records (adds 15–25% to resale price)
- Galvanized or aluminum construction (higher initial cost, retains value)
- Sliding chassis (sells faster than fixed)
- Recent brake and suspension overhaul (buyers pay premium)
- No frame crack history (critical for value)
Cost per Container Move (Example Calculation)
Assumptions:
- Chassis cost: $35,000
- Lifespan: 15 years (500,000 miles)
- Annual maintenance: $2,500
- Annual tire replacement: $1,500
- Annual utilization: 250 moves (containers)
Annual cost:
- Depreciation: $2,333
- Maintenance: $2,500
- Tires: $1,500
- Total annual: $6,333
- Cost per container move: $25.33
(Excludes tractor, fuel, driver, insurance)
10. Conclusion: Is a 3-Axle Container Skeleton Semi-Trailer Right for Your Operation?
The 3-axle container skeleton semi-trailer is the most popular intermodal chassis configuration for good reason. It balances payload capacity (55,000–60,000 lbs), legal compliance (80,000 lbs GVW with most tractors), maneuverability, and cost.
Choose a 3-axle container skeleton if:
- You operate in port drayage, intermodal, or container logistics
- You need maximum legal payload without moving to 4 axles
- You handle standard 20ft, 40ft, or 45ft ISO containers
- You want a simple, durable trailer with low maintenance costs
- You value the ability to drop and hook containers quickly
Consider alternatives if:
- You rarely handle containers (use a dry van or flatbed)
- Your containers are consistently overweight (consider 4-axle or spread axle)
- You need to carry non-container freight on return trips (container chassis cannot)
A quality 3-axle container skeleton semi-trailer from a reputable manufacturer — combined with disciplined maintenance and safety protocols — will deliver 15–25 years of reliable service in even the most demanding port and drayage environments.
Contact Us
If you have any questions about our curtain side trailers, customization options, pricing, or after-sales service, please do not hesitate to Contact Us. Our professional sales and technical team is ready to assist you, provide detailed product information, and work with you to design the perfect curtain side trailer for your logistics business. We are committed to building long-term, mutually beneficial partnerships with our global customers and supporting your success in the dynamic world of freight transportation.
We look forward to working with you!
Address:Room 910, time square, No52, Hongkong mid Road, shinan District, Qingdao, Shandong Province, China
WhatsApp: +86 13455277771 +8617667211331
Email: nick@cjstrailer.com calista.wang@cjstrailer.com
contact :Nick Zhu Calista
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WApp: +86 13455277771
Email: nick@cjstrailer.com
contact :Nick Zhu
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| BASE PLATE | 3.0mm pattern plate | BRAKE VALVE GROUP | WABCO |
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●The two side beams are made of high-strength steel bending parts,taking into account rigidity and toughness,to avoid irreversible downward bending fracture after loading.
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