DD502S | Bus steering axle
The Dongfeng Dana Coach Axle DF502S is a high-performance I-beam steering axle based on the F5.0 platform with a rated load of 5000 kg.
It adopts a fixed wheelbase of 2363 mm with a precision layout and a rim mounting distance of 2086 mm without adjustment. Standard air brake system (compatible with 19.5″ rims), with a kingpin center distance of 1753 mm to enhance steering rigidity, and an exclusive 120+25 mm composite front axle drop (the highest in the series) significantly improves maneuverability on complex terrain;
Compatible with 245/70R19.5 wide-base tires and 7.50×19.5 rims, with an outer wheel steering angle of 49° (industry-leading level), and a kingpin inclination of 9°/0.5° to optimize handling stability. Standard equipped with 8-M20×1.5 high-strength bolts and compatible with maintenance-free hub units.
We provide full life cycle services for all customers, from design to power system supply, from installation to commissioning, from after-sales service training to spare parts supply, from trouble shooting to overhaul technical support.
DD502S Product Features
Heavy-duty upgrade: Covers the 4.2–5.0 ton class, with precision casting + alloy steel reinforcement for the bridge body, improving torsional rigidity by 30% to meet the heavy-duty requirements of intercity/tourist buses.
Ultra-quiet operation: Spiral bevel gear grinding process + active noise reduction technology, with NVH optimization of 45% and driving noise ≤62dB.
All-around safety braking: Standard dual-circuit air brakes + EBS + ABS (5.0-ton models support hydraulic retarder), response time ≤0.15 seconds, braking efficiency improved by 20%.
Maintenance-free design: IP6K9K sealing + intelligent centralized lubrication, key components (bearings/gears) with a lifespan of 500,000 kilometers, maintenance intervals exceeding 10,000 kilometers.
Technical Specifications
| Category: | Technical Parameters |
| Platform: | DD502S |
| Basic Structure: | I-beam |
| Rated Load (kg): | 5000 |
| Brake Structure/Specifications: | Air brake/19.5″ |
| Maximum External Width A (mm): | 2363 |
| Rim Installation Distance B (mm): | 2086 |
| Kingpin Center Distance C (mm): | 1753 |
| Spring Distance D (mm): | 932 |
| Front Axle Drop (mm): | 120+25 |
| Kingpin Inclination/Wheel Camber: | 9°/0.5° |
| Inner Wheel Steering Angle/Outer Wheel Steering Angle: | 49° |
| Rim: | 7.50×19.5 |
| Tire: | 245/70R19.5 |
| Wheel Bolts: | 8-M20×1.5 |
| Wheel Bolt Circle E (mm): | φ275 |
| Wheel Toe (mm): | 1 – 3 |
| Air Chamber Interface Dimensions: | NPT1/4、Z1/4、M16×1.5 |
| Optional Information: | Maintenance-Free Hub Unit |
| Lead Time: | 15 – 30 Working Days |
| Payment Terms: | T/T, L/C |
Model | Rated Load (Kg) | Brake Structure Form/Specification | Maximum Overall Width A (mm) | Rim | Tire | Wheel Bolt |
| DD502S | 5000 | Air brake/19.5″ | 2363 | 7.50×19.5 | 245/70R19.5 | 8 – M20×1.5 |
| DF501S | 5000 | Air brake/φ400×130、φ400×150、22.5″ | 2173 – 2521 | 8.25×22.5 | 11.00R22.5 | 10 – M20×1.5 |
| DF451S | 4500 | Air brake/φ400×130、19.5″ | 2220 – 2342 | 7.50×19.5 | 245/70R19.5 | 8 – M20×1.5 |
| DF421S | 4200 | Air brake/φ360×130、φ400×130、19.5″ | 2205 – 2472 | 7.50×19.5 | 245/70R19.5 | 8 – M20×1.5 |
| ——END—— | ||||||
Basic information of bus steering axle | |||
| Category | Technical Parameter | Basic Structure Form | I – beam |
| Rim Mounting Distance B (mm) | 2086 | Kingpin Center Distance C (mm) | 1753 |
| Spring Distance D (mm) | 932 | Front Axle Drop (mm) | 120 + 25 |
| Kingpin Inclination Angle/Wheel Camber Angle | 9°/0.5° | Inner Wheel Steering Angle/Outer Wheel Steering Angle | 49° |
| Wheel Bolt Distribution Circle E (mm) | φ275 | Wheel Toe – in (mm) | 1-3 |
| Air Chamber Interface Size | NPT1/4、Z1/4、M16×1.5 | Optional Information | Maintenance – free Hub Unit |
| ——END—— | |||

Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

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