Straight Beam Flat Semi-Trailer

1. Basic Structure & Design

Frame Type: Straight beam structure (longitudinal beams with no obvious curvature)

Main Beam Material: High-strength low-alloy steel (Q345B or Q690)

Section size: 300×150×8×12 mm (height×width×web thickness×flange thickness) for 3-axle models; 350×160×10×14 mm for 4-axle models

Deck Material: Checker plate steel (thickness 3-5 mm) or flat steel plate; anti-slip surface treatment to prevent cargo sliding

Side/Rear Rails: Optional detachable steel rails (height 300-500 mm) or foldable rails; easy for loading/unloading oversized cargo

2. Dimension Parameters

Overall Length: 10.0-13.7 meters (32.8-44.9 feet); 13.7 meters is the common maximum for road compliance in most regions

Deck Length: 9.5-13.0 meters (31.2-42.7 feet); varies with overall length (excludes front tractor connection area)

Overall Width: 2.4-2.55 meters (7.9-8.4 feet); complies with standard road width limits

Deck Height: 1.2-1.5 meters (3.9-4.9 feet); depends on tire size and suspension type (lower for easier cargo loading)

Wheelbase:

3-axle models: 6.8+1.3 meters (tandem rear axles with 1.3-meter spacing)

4-axle models: 6.0+1.3+1.3 meters (triple rear axles with 1.3-meter spacing between adjacent axles)

Ground Clearance: 280-350 mm (11.0-13.8 inches); ensures passability on uneven roads

3. Load Capacity

Rated Payload:

3-axle models: 30-35 metric tons (66,139-77,162 lbs)

4-axle models: 40-45 metric tons (88,185-99,208 lbs)

Axle Group Load Distribution: Equal load on each axle (e.g., ~11.7 tons per axle for 3-axle 35-ton models)

Max Static Load: 120% of rated payload (for short-duration loading during crane lifting)

Load Distribution Standard: Complies with ISO 1496-1 (Freight containers - Specification and testing) for container transport

4. Frame & Chassis

Longitudinal Beams: 2 parallel straight beams; welded with crossbeams (spacing 500-800 mm) for structural rigidity

Crossbeams: Rectangular steel tubes (150×100×6 mm) or I-beams; connected to longitudinal beams via CO₂ gas shielded welding

Fifth Wheel (Kingpin):

Type: 50# or 90# standard kingpin (SAE J844 specification)

Material: 20CrMnTi alloy steel; quenched and tempered for wear resistance

Installation: Welded to the front end of the frame, aligned with the trailer centerline

5. Axle & Suspension System

Axle Quantity: 3 or 4 axles (rear axles; no front steering axle)

Axle Type: Heavy-duty commercial trailer axles (e.g., BPW, SAF-Holland equivalent)

Axle shaft diameter: 80-100 mm (3.1-3.9 inches); forged 45# steel

Suspension Type:

Standard: Mechanical leaf spring suspension (10-12 leaves per axle; 60Si2Mn spring steel)

Optional: Air suspension (2-4 airbags per axle; capacity 10-13 tons per airbag) for better shock absorption and cargo protection

Shock Absorbers: Optional hydraulic shock absorbers (for rough-road use)

6. Tires & Wheels

Tire Quantity: 6 tires (3-axle) or 8 tires (4-axle) + 1-2 spare tires

Tire Specification: 295/80R22.5 (radial tires for highway use) or 11R22.5; load index 152/148 (max load 3,550 kg per tire at 10 km/h)

Wheel Rim: 22.5×9.00 inches; steel rims (standard) or aluminum alloy rims (optional, for weight reduction)

Tire Inflation Pressure: 850-950 kPa (123-138 psi) for optimal load-bearing and wear resistance

7. Braking System

Brake Type: Pneumatic drum brakes (standard) or disc brakes (optional)

Drum brakes: Diameter 420 mm, width 180 mm (cast iron material; heat-resistant)

Disc brakes: Diameter 410 mm, thickness 32 mm (high-carbon steel with anti-rust coating)

Brake Chambers: 30/30 (front axles) or 30/45 (rear axles) model; ensures sufficient braking force

ABS (Anti-lock Braking System): Standard (complies with ECE R13 and GB 7258); prevents wheel lock during emergency braking

Parking Brake: Spring brake (mechanical; secures the trailer when parked)

8. Compatibility & Adaptability

Tractor Compatibility: Fits tractors with 50# or 90# kingpin; compatible with mainstream tractor brands (e.g., Sinotruk, FAW, Volvo, Mercedes-Benz)

Cargo Compatibility: Ideal for transporting steel plates, construction machinery (excavators, loaders), 20-40 ft standard containers, and oversized non-fragile cargo

Loading Equipment Compatibility: Accessible for forklifts, cranes, and reach stackers (flat deck design with no obstacles)

9. Safety & Additional Features

Reflective Markings: Yellow/red reflective tapes on the sides and rear (complies with ECE R27); enhances visibility at night or in low-light conditions

Support Legs: 2 manual or electric support legs (load capacity 20 tons each); for stable parking when disconnected from the tractor

Guardrails: Optional side guardrails (height 500 mm) and rear bumpers (steel material; 10 mm thickness) to prevent collision damage

Toolbox: Optional steel toolbox (mounted on the frame) for storing maintenance tools

Notes

Specifications vary by manufacturer (e.g., CIMC, XCMG, Schmitz Cargobull) and custom requirements (e.g., extra-heavy load upgrades, cold-region anti-corrosion treatment). For road compliance, confirm local regulations (e.g., length/width limits in the EU, US, or Southeast Asia) before finalizing configurations. Refer to the manufacturer's technical datasheet for precise parameters.

The Straight Beam Flat Semi-Trailer (Model: SB-FT137) is a heavy-duty, road-compliant transport solution engineered for efficient haulage of large, heavy, or irregularly shaped cargo. Built with a robust straight beam frame and anti-slip flat deck, it excels in industries like logistics, steel, construction, and machinery transport-supporting 20-40 ft containers, excavators, steel plates, and oversized equipment. With a 13.7-meter overall length, 35-metric-ton rated payload (3-axle configuration), and compliance with international standards (ISO 1496-1 for containers, ECE R13 for braking), this semi-trailer balances durability, versatility, and safety. It is compatible with mainstream tractors (Sinotruk, FAW, Volvo, Mercedes-Benz) via 50#/90# kingpins, making it a reliable choice for global trade clients seeking consistent performance in long-haul or heavy-duty operations.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) features a ultra-durable straight beam frame that forms the core of its load-bearing capability. The main longitudinal beams are crafted from Q345B high-strength low-alloy steel (300×150×8×12 mm section size), with crossbeams (150×100×6 mm rectangular steel tubes) spaced 600 mm apart-ensuring even load distribution and resistance to bending or deformation when hauling 35-metric-ton cargo. The frame undergoes CO₂ gas shielded welding for strong, seamless joints, and a hot-dip galvanizing coating (Zn thickness ≥85 μm) to resist rust, extending service life to 8+ years under regular use.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) boasts optimized dimensions for maximum cargo capacity while meeting global road regulations. Its 13.7-meter overall length (13.0-meter flat deck length) and 2.55-meter width accommodate 40 ft standard containers or large machinery (e.g., 20-ton excavators) without overwidth/overlength violations. The 1.35-meter deck height (from ground) and 320-mm ground clearance simplify loading via forklifts or cranes, reducing time spent on cargo handling and minimizing strain on loading equipment.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) is equipped with a high-performance 3-axle system and suspension to ensure stable driving. The axles (equivalent to BPW/SAF-Holland heavy-duty models) have 85-mm forged steel shafts (45# steel) and double-row sealed bearings, preventing dust/water ingress and reducing maintenance needs. It comes standard with mechanical leaf spring suspension (12 leaves per axle, 60Si2Mn spring steel) for strong shock absorption-ideal for rough highways or construction-site roads-or an optional air suspension upgrade for delicate cargo (e.g., precision machinery) that requires smoother transport.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) prioritizes cargo security and easy loading with its anti-slip flat deck and flexible rail design. The deck is made of 4-mm thick checker plate steel, which creates friction to prevent cargo sliding during acceleration or braking-critical for transporting steel coils or loose machinery parts. Optional detachable side/rear rails (300-mm height, Q235 steel) can be installed for irregular cargo (e.g., pipes) or removed entirely for oversize items, eliminating obstacles for crane loading and adapting to diverse client needs.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) ensures reliable braking and road safety with a fully compliant pneumatic system. It uses 420-mm diameter cast iron drum brakes (180-mm width) with 30/45 pneumatic brake chambers, delivering strong stopping force even when fully loaded. A standard ABS (Anti-lock Braking System) (ECE R13-certified) prevents wheel lock during emergency braking, reducing skid risk on wet or icy roads. A mechanical spring parking brake secures the trailer firmly when parked, avoiding accidental movement during loading or overnight stops.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) offers broad compatibility with tractors and cargo types, making it a versatile addition to any fleet. Its 50#/90# standard kingpin (20CrMnTi alloy steel, quenched for wear resistance) fits 90% of global tractor models, from Chinese brands like Sinotruk to international brands like Volvo. The flat deck design with no 凸起 s or obstacles supports not only containers and machinery but also specialized cargo like wind turbine components or prefabricated building parts-expanding its use cases across industries.

Straight Beam Flat Semi-Trailer (Model: SB-FT137) includes practical additional features to enhance usability for operators. Two electric support legs (20-ton load capacity each) replace manual cranking, allowing quick, effortless leveling of the trailer when disconnected from the tractor-saving time during loading. A weatherproof steel toolbox (mounted on the frame side) stores maintenance tools (wrenches, spare parts), while yellow/red reflective tapes (ECE R27-compliant) on the sides and rear boost visibility at night or in low-light conditions, meeting safety requirements in Europe, North America, and Southeast Asia.

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