YD36-009A/009B Medium-Heavy Duty Trailer Coupler
High-performance coupler designed for RV, engineering, and cargo applications with 7k/12k LBS capacity, SAE Class III compliance, and durable black coating with anti-theft chain.
Product Specifications
Core Parameter Summary
| Parameter Category |
YD36-009A |
YD36-009B |
| Model No. |
YD36-009A |
YD36-009B |
| Product Type |
Medium-heavy duty trailer coupler |
Heavy-duty trailer dedicated coupler |
| Compatible Ball Diameter |
2" (50.8mm) |
2-5/16" (58.7mm) |
| Maximum Capacity |
7,000 LBS (3,175.1kg) |
12,000 LBS (5,443.1kg) |
| Finish |
Black epoxy resin paint + zinc plating |
Black coating with wear-resistant ceramic particles |
| Material & Structure |
- Body: High-strength alloy steel (≥450MPa)
- Standard steel anti-theft chain (800N)
- Fluororubber anti-slip gasket
|
- Body: Ultra-high strength alloy steel (≥500MPa)
- Thickened steel anti-theft chain (1,200N)
- Metal-reinforced anti-slip gasket
|
Key Features
- Heavy-load structure: Forged alloy steel construction for maximum durability
- Precision fit: Ball engagement gap ≤0.2mm for smooth towing
- Weather resistance: Black coating with zinc plating base resists salt spray and UV
- Safety features: Anti-theft chain and anti-slip gasket for secure operation
- Standard compliance: SAE Class III certified for global compatibility
Product Details
High-Strength Materials & Heavy-Load Structure
The YD36-009A features integral forging of alloy steel with 7,000 LBS capacity, while the YD36-009B upgrades to ultra-high strength alloy steel with 12,000 LBS capacity. Both models provide precise ball compatibility with engagement gaps ≤0.2mm for vibration-free operation.
Dual Protection & Enhanced Durability
Three-layer surface protection (zinc plating + epoxy resin + clear coat) provides excellent weather resistance. The YD36-009A resists salt spray for 72 hours, while the YD36-009B extends this to 96 hours with added ceramic particles.
SAE Class III Standard & Custom Installation
No fixed channel design allows for flexible adaptation to non-standard trailers. Both models are SAE Class III certified, with YD36-009B additionally passing heavy-duty trailer special tests.
Application Scenarios
Long-Distance Towing of Medium-Heavy Duty RVs (YD36-009A)
Ideal for RVs up to 3 tons with 2" balls, providing stable towing, salt spray resistance, and quiet operation (≤40 decibels). Custom brackets adapt to channel-free structures without vehicle modification.
Heavy-Duty Engineering Trailer Operations (YD36-009B)
Designed for trailers up to 5 tons with 2-5/16" balls, featuring overload warning, enhanced salt spray resistance, and reduced maintenance costs for harsh environments.
Frequently Asked Questions
Q1: There is slight vibration in the coupler during towing. What is the reason?
Typically caused by improper engagement gaps or tight anti-theft chains. Adjust the gap to 0.1-0.2mm, check chain tension, and clean engagement surfaces.
Q2: How to determine whether a trailer is suitable for YD36-009A or 009B?
Consider trailer weight (≤7,000 LBS for 009A, ≤12,000 LBS for 009B), ball diameter (2" or 2-5/16"), and usage scenario (harsh environments favor 009B).
Q3: What bolt grade and torque values should be used?
YD36-009A requires Grade 10.9 bolts (60-65N*m), while YD36-009B needs Grade 12.9 bolts (80-85N*m). Always use a digital torque wrench for precise tightening.
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