Product Specification

YD36 Series Trailer Coupler (Trailer Coupler Series YD36) Webpage Detail Page (English)

I. Product Specifications (SPECIFICATION)

1. Core Parameter Summary Table

2. Model Group Comparison Table

II. Product Details (PRODUCT DETAILS)

1. Multi-Specification Precise Matching, Covering from Light-Duty to Heavy-Duty

(1) Subdivided Load-Bearing Grades, No Overload Risks

• Designed in grades according to trailer weight: The light-duty group (2,000 LBS) is suitable for household small trailers, and the heavy-duty group (12,000 LBS) is suitable for commercial heavy-duty trailers — avoiding the risk of breakage caused by "small couplers towing heavy vehicles" (ordinary universal couplers have a large load-bearing range and are prone to damage due to overload);
• Large-sized ball compatibility: The 2-5/16" ball (exclusive to 009B) is specially designed for heavy-duty trailers. The engagement area between the ball and the coupler is 30% larger than that of the 2" model, enabling more uniform traction transmission and avoiding deformation caused by excessive local stress.

(2) Flexible Channel Width Compatibility, Strong Versatility

• Covers mainstream channel widths of 2"/2-1/2"/3" (001-007), compatible with most standard trailer slide rails (such as 2" and 3" channel trailers common in the North American market);
• Models with no specific channel (008-009B) support customized installation and can be adapted to non-standard channel trailers (such as modified work trailers) by adjusting fixed brackets, solving the pain point of "no compatible couplers for special trailers".

2. Reinforced Materials + Corrosion-Resistant Treatment, Long Durability

(1) High-Strength Base Materials, Rugged and Impact-Resistant

• The light-duty/small & medium-duty groups (001-008) adopt integral stamping of carbon steel, with a bending strength of ≥380MPa and no deformation in the 1m drop test (empty coupler);
• The medium-heavy-duty/heavy-duty groups (009A/009B) are forged from alloy steel, with a shear strength of ≥450MPa. When towing a 12-ton heavy-duty trailer, the coupler shows no tilting or weld cracking (ordinary carbon steel couplers are prone to deformation in the same test).

(2) Differentiated Corrosion Resistance, Adaptable to Multiple Environments

• Zinc plating (001-007): Through hot-dip galvanizing process, the zinc layer thickness is ≥80μm, with no rust for 2 years of use in dry environments, meeting household and light commercial needs;
• Black coating (008-009B): Adopts epoxy resin black coating + zinc plating base, with no corrosion in 48-hour salt spray tests and no rust for 1 year of use in coastal areas and rainy environments, far exceeding the corrosion resistance of zinc plating.

3. Detail Optimization + American Standard Compatibility, Dual Advantages of User Experience and Safety

(1) Anti-Slip and Noise Reduction, More Stable Towing

• Built-in rubber anti-slip gaskets (standard for the entire series): When the coupler engages with the ball, the gaskets fill the gap, reducing "metal collision noise" during driving (noise reduced to below 50 decibels) and avoiding excessive wear between the ball and the coupler;
• Some models have lock hole designs (008-009B): Can be paired with trailer locks to lock the coupler and the ball, preventing trailer theft and increasing anti-theft safety by 60%.

(2) Compliance with American Standards, Global Compatibility

• The entire series has passed the American trailer coupler standard tests (traction, load-bearing stability, and fatigue life meet standards), and can be directly compatible with trailers and tow vehicles in the North American market (such as pickup trucks of Ford, Chevrolet and other brands);
• The load-bearing label is clear (each coupler is marked with Max Capacity), avoiding safety hazards caused by incorrect use by users and complying with commercial scenario specifications.

III. Application Scenarios (APPLICATION SCENARIOS)

1. Towing of Household Small Camping Trailers (Core Scenarios: YD36-001/002/003)

1. Model Selection:
   - Ball diameter 1-7/8", channel width 2", load-bearing requirement ≤2,000 LBS, so YD36-001 (zinc plating, suitable for dry/slightly humid environments) is selected;
   2. Installation and Use:
   - Installation: Professionals fix the coupler with Grade 8.8 bolts, adjust the engagement gap with the 1-7/8" ball to 0.1mm, and test for no wobbling during towing;
   - Daily Use: A 200km round trip for weekend camping (including highways and rural dirt roads), with no noise from the coupler and no rust on the zinc layer after rainy use;
   - Durability: Used twice a month, the coupler shows no deformation after 1 year, and the anti-slip gaskets have no aging;
   3. Advantage Performance:
   - Precisely compatible with small trailers, no overload risk;
   - Zinc plating meets household corrosion resistance needs, with moderate cost.
   Result: The towing safety of the household camping trailer is improved, with no noise or corrosion issues, fully adapting to household leisure scenarios.

2. Towing of Commercial Medium-Sized Cargo Trailers (Core Scenario: YD36-009A)

1. Model Selection:
   - Ball diameter 2", load-bearing requirement 7,000 LBS, no specific channel, so YD36-009A (black coating, rainwater resistant + anti-theft lock hole) is selected;
   2. Operation and Use:
   - Installation: Custom fixed brackets are made, the coupler is fixed with Grade 10.9 high-strength bolts, and paired with a trailer lock for anti-theft;
   - Towing Performance: Daily cargo transportation with a 100km round trip, no tilting or weld cracking of the coupler, and no rust on the black coating after rainy use;
   - Anti-Theft Effect: The trailer is parked at the freight station at night, and there is no theft risk within 3 months after locking the coupler (there were cases of unlocked trailer theft at the same station);
   3. Management Advantages:
   - Complies with American standards, compatible with the company's imported pickup trucks without additional modification;
   - The black coating is wear-resistant, and the appearance remains neat after 1 year of use, reducing replacement frequency.
   Result: The towing efficiency of commercial cargo trailers is increased by 30%, with no safety hazards or theft issues, adapting to high-frequency commercial scenarios.

3. Towing of Heavy-Duty Engineering Work Trailers (Core Scenario: YD36-009B)

1. Model Selection:
   - Ball diameter 2-5/16", load-bearing requirement 12,000 LBS, salt spray resistant, so YD36-009B (alloy steel + black coating) is selected;
   2. Operation and Use:
   - Installation: A professional team fixes the coupler with Grade 12.9 bolts, adjusts the engagement gap to 0.1mm, ensuring no wobbling during heavy-load towing;
   - Environmental Resistance Performance: Used at coastal construction sites for 6 months, no rust on the black coating, and no dust jamming in the coupler (can be rinsed with a high-pressure water gun weekly);
   - Heavy-Load Test: When towing 10 tons of engineering equipment, the coupler shows no deformation, and no displacement of the coupler during emergency braking of the truck, ensuring operation safety;
   3. Durability:
   - High-frequency use (3-4 times a day), no weld cracking of the coupler after 1 year, and only slight wear of the anti-slip gaskets (low replacement cost).
   Result: The towing safety of engineering work trailers is improved, with no corrosion or heavy-load failure issues, adapting to harsh engineering scenarios.

IV. Frequently Asked Questions (FAQ)

Q1: There is obvious wobbling and noise from the coupler during towing after installation. What is the reason?

1. Adjust Engagement Gap: If the gap between the coupler and the ball is ＞0.3mm, it will cause wobbling — loosen the coupler fixing bolts with a torque wrench, push the coupler to reduce the gap with the ball (adjust to 0.1-0.2mm), retighten the bolts (torque value refers to the product manual, usually 50-80N·m);
2. Check Anti-Slip Gaskets: Aging gaskets (service life about 2 years) will increase the gap and noise — remove the old gaskets and replace with rubber gaskets of the same model (available from the merchant). After installation, wobbling and noise will be significantly reduced;
3. Confirm Model Compatibility: Serious wobbling will occur if the ball diameter does not match the coupler (e.g., a 2" ball used with a 1-7/8" coupler) — check the ball diameter and coupler model, and replace with the corresponding model (e.g., a 2" ball for YD36-004-009A).

Q2: Zinc-plated couplers show rust on the surface when used in coastal areas. How to handle it?

1. Minor Rust Treatment: Gently polish the rust with fine sandpaper (1000 grit) (avoid scratching the underlying zinc layer) until the zinc layer is exposed. Then spray with zinc layer repair agent (matching model available from the merchant) and air-dry for 24 hours;
2. Severe Rust Treatment: If the rust area exceeds 15% (corroded to the base material), it is recommended to replace the coupler (to avoid breakage during towing). For coastal areas, prioritize black-coated models (YD36-008-009B);
3. Preventive Maintenance: Rinse the salt on the coupler surface with fresh water every 2 weeks, and apply a layer of industrial anti-rust wax (non-corrosive) after drying to enhance salt spray resistance, suitable for users in coastal areas.

Q3: How to select the correct coupler model based on trailer parameters?

1. Confirm Ball Diameter:
   - Measure the trailer ball diameter (with a caliper). For 1-7/8", select YD36-001-003; for 2", select YD36-004-009A; for 2-5/16", select YD36-009B;
2. Confirm Channel Width:
   - Measure the trailer slide rail channel width. For 2", select 001/004; for 2-1/2", select 002/005; for 3", select 003/006/007; for no specific channel, select 008-009B;
3. Confirm Trailer Weight:
   - Trailer weight ≤907kg (2,000 LBS): Select 001-003/007;
   - 907-1,588kg (3,500 LBS): Select 004-006;
   - 1,588-2,268kg (5,000 LBS): Select 008;
   - 2,268-3,175kg (7,000 LBS): Select 009A;
   - 3,175-5,443kg (12,000 LBS): Select 009B;
   - Example: Trailer with 2" ball, 3" channel width, and 1.2-ton weight: Select YD36-006 (3,500 LBS load-bearing).

Q4: What are the requirements for bolt selection and torque value when installing the coupler?

1. Bolt Specification Selection:
   - Light-Duty Group (2,000 LBS): Select high-strength bolts of Grade 8.8 or above, diameter ≥8mm (e.g., M8×20mm);
   - Small & Medium-Duty Group (3,500 LBS): Select bolts of Grade 8.8 or above, diameter ≥10mm (e.g., M10×25mm);
   - Medium-Heavy-Duty/Heavy-Duty Groups (5,000-12,000 LBS): Select bolts of Grade 10.9 or above, diameter ≥12mm (e.g., M12×30mm);
   - Ordinary carbon steel bolts (e.g., Grade 4.8) are prohibited, as they are prone to breakage due to insufficient load-bearing;
2. Torque Value Requirements:
   - M8 bolts: Torque value 25-30N·m;
   - M10 bolts: Torque value 40-45N·m;
   - M12 bolts: Torque value 60-65N·m;
   - A torque wrench must be used for tightening to ensure uniform bolt stress, avoiding looseness (coupler wobbling) or over-tightening (bolt breakage);
3. Post-Installation Check: Wobble the coupler after tightening, with no obvious displacement; conduct a 10km towing test, with no bolt loosening or coupler abnormal noise — this indicates qualified installation.