Trailer Arm Pin

Trailer Arm Pin  is a key component in a trailer or trailer that is used to connect the trailer arm to the frame, ensuring that the trailer or trailer can be safely and stably connected to the trailer vehicle.

Definition and function
Definition: Trailer Arm Pin, or trailer arm pin, is a cylindrical or similarly shaped metal component designed to be inserted into a hole between the trailer arm and the frame and secured by a locking device (such as a lock pin, snap, etc.) to achieve a firm connection between the two.
Features:
Connection function: The Trailer Arm Pin serves as the connection point between the trailer arm and the frame and undertakes the important task of safely connecting the trailer or trailer to the towing vehicle.
Transfer load: In the process of driving, the trailer arm pin needs to withstand a variety of loads from the trailer or trailer, including static weight, dynamic impact force and the impact and vibration caused by road bumps.
Ensure stability: A strong connection helps to ensure the stability of the trailer or trailer during driving and prevents safety accidents caused by loose or falling connections.

Mechanical fixation
Lock the trailer arm (trailer hook) with the vehicle traction interface (such as trailer ball head, square mouth, etc.) to prevent separation.

Bear load
High shear and tensile strength is required to withstand the transverse and longitudinal forces of the trailer during traction.

Safety guarantee
It is one of the core components of trailer safety to prevent accidental uncoupling of trailer.

 

Material:
It is usually made of high-strength alloy steel or stainless steel, and the surface is galvanized or sprayed with anti-rust layer to adapt to the complex outdoor environment.

Structure:

Pin rod: Cylindrical body, diameter of 5/8 inch, 3/4 inch, etc., to match the trailer arm aperture.

Locking device:

Spring pin: fixed through the spring buckle, easy to install.

With locking pin: Additional lock or safety bolt to prevent theft or accidental release (such as off-road or long-distance use).

Handle or pull ring: easy to insert and remove quickly, some design with anti-rotation function.

Standard spring pin

Simple structure, economical and practical, suitable for daily light trailer (such as RV, small container).

Spring elasticity should be checked regularly to prevent aging failure.

Safety lock pin

Built-in lock core or external lock, anti-theft design, suitable for outdoor long time parking or high value equipment hauling.

Heavy pin

Thick design, load capacity up to several tons, used for construction machinery, large trailer traction.

Matching size

Ensure that the diameter of the pin is consistent with the trailer arm aperture to avoid loosening or wear.

Check status

Regularly check whether the pin body is rusted and deformed, and whether the spring fasteners are flexible.

Lubrication maintenance

Apply anti-rust grease to reduce friction and corrosion and extend life.

Load bearing limitation

The rated load of the pin is strictly followed, and overloading may lead to fracture risk.

Q: What if the trailer arm pin falls off?
A: Stop the car immediately, replace the spare pin and check whether the locking device is damaged.

Q: How to choose a trailer pin with lock?
A: Preferred to choose waterproof lock core, anti-saw design brand products (such as Curt, Reese, etc.).

 

Trailer Arm Pin  is a small part, it is the core guarantee of trailer safety. Selecting the right type according to the application scenario and maintaining it regularly can greatly reduce the risk during traction.

 

 

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