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Legal Stamp Requirements for Tow Balls

by | Sep 7, 2023 | ADRs & Regulations, Industry News | 0 comments

The stamping of tow balls is a legal requirement in accordance with the Australian Standard AS4771.2. This standard sets forth the minimum safety criteria applicable to tow balls designed for vehicles with a Gross Trailer Mass (GTM) exceeding 3.5 tonnes.

Legal Tow Ball Requirements: Stamps

4.5t tow ball

Example of Couplemate’s ADR Compliant Tow Ball

The stamping process entails the inclusion of specific information, which serves important safety and accountability purposes:

  • Manufacturer’s Mark: The manufacturer’s mark serves as an identifier for the company responsible for producing the tow ball. This is crucial for tracing accountability in case of any issues or defects with the tow ball.
  • Tow Ball Rating: The tow ball rating represents the maximum weight that the tow ball can safely handle. This information is essential to prevent overloading, which could potentially pose a safety risk.
  • Tow Ball Size: This denotes the size of the trailer coupling that the tow ball is compatible with. Ensuring compatibility between the tow ball and trailer coupling is vital for safe towing.
  • Batch Number: The batch number acts as a unique identifier for the tow ball. This feature is valuable for tracking and identifying any potential batch-related problems or defects.

Tow Ball Testing Requirements

The dynamic testing requirements stipulated by AS4771.2 are designed to assess a tow ball’s ability to withstand the forces it encounters during trailer towing. These tests include the horizontal alternating force test, simulating cornering forces, and the vertical alternating force test, replicating forces experienced when traversing bumps.

Another critical factor is the static vertical coupling load, which represents the trailer’s weight supported by the tow ball when the trailer is stationary. This load must be considered when determining the tow ball’s maximum towing capacity. It is of utmost importance to ensure that your tow ball bears the proper stamping and adheres to Australian Standard AS4771.2. This not only safeguards your own safety but also contributes to road safety for others.

Purchasing Safe & Compliant Towing Equipment

Here are some additional recommendations for selecting a tow ball that is both safe and compliant with the law:

  1. Purchase from a Reputable Retailer: Obtain your tow ball from a trustworthy and reputable retailer to ensure product quality and compliance.
  2. Verify AS4771.2 Stamping: Confirm that the tow ball is clearly stamped with the Australian Standard AS4771.2 markings.
  3. Check Tow Ball Rating: Ensure that the tow ball rating matches the weight requirements of your trailer to prevent overloading.
  4. Regular Inspection: Routinely inspect your tow ball for any signs of wear and tear, as a well-maintained tow ball is essential for safe towing.

Purchase Australian-Made Tow Balls Here:

By following these guidelines, you can ensure that your tow ball is both safe and legal.


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