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How do I select the correct Dee or Bow Shackle?
Rated shackles are tested and rated according to AS2321 Short Link Chain for Lifting Purposes.
However, when the trailer chain and shackles are connected for towing, the rules below apply.
The marking on a Rated Shackle is the Safe Working Load Limit (WLL)
The Breaking load limit (BLL) for rated shackle is WLL x 6, Example, a 1 tonne rated Dee Shackle has a BLL of 1t x 6 = 6t (Breaking Load Limit)
Calculate the ATM as follows, BLL / 1.5 = 6t / 1.5 =4t
Therefore a 1t Dee Shackle can be used on trailers up to 4t. Please see the following table for more ratings
0.75t Dee Shackle = 3t ATM Caravan.
1t Dee Shackle = 4t ATM Caravan.
1.5t Dee Shackle = 6t ATM Caravan.
2t Dee Shackle = 8t ATM Caravan.
Note: The design of the attachment to the drawbar must have sufficient load capacity to match the rating of the required chain.
Rated shackles and what you need to know about Rated Dee Shackles, Safety Chains, And Chain Holders
Rated shackles are not a requirement for caravans and trailers under 3.5t. A dee shackle must be compatible with the safety chain, and the safety chain must be identified with at least the same capacity as the ATM.
Trailers over 2.5t must have two safety chains; each chain must be of the same capacity or exceed the capacity of the ATM.
Australian Standards require safety chains on trailers over 3.5t to be connected to your trailer via safety chain holders or approved high tensile links. Dee shackles are not an authorized device.
Trailers Under 2.5t
If your trailer does not exceed 2.5 tonnes ATM, it must have at least one safety chain complying with Australian Standard AS 4177.4-1994, or Australian Standard AS 4177.4-2004 ‘Caravan and light trailer towing components – Part 4.
Trailers 2.5 To 3.5t
Trailer over 2.5 tonnes and under 3.5 tonnes ATM, it must have two safety chains of a designation of 3500 kg or higher for each chain.
Trailers Over 3.5t
According to Standard AS 4177.4-1994 and Australian Standard AS 4177.4–2004, trailers over 3.5 tonnes ATM must have two safety chains made from steel of a minimum 800 MPa breaking stress.
Chains should also conform to the mechanical properties of Grade-T chain as specified in Australian Standard AS 2321-1979 ‘Short Link Chain for Lifting Purposes (non-calibrated), or Australian Standard AS 2321–2006 Short Link Chain for Lifting Purposes.
Ultimately, you’ll need to go in for a chain sized such that the minimum breaking load exceeds the ATM.
The Road Vehicle Standards Bill 2017
Note: The Road Vehicle Standards Bill 2017 is intended to replace the Motor Vehicle Standards Act 1989 (MVSA). It is expected to implement the Australian Government’s announced Reforms to the regulatory framework for the safety, environmental and anti-theft performance of all road vehicles. Vehicles are defined as being provided to the Australian market for the first time – both new and used.
The reforms will deliver modernised legislation to increase community safety and remove unnecessary processes for businesses.
Furthermore, the Australian Government has released an Exposure Draft of the Road Vehicle Standards Bill for public information. The Bill will need to be debated and passed by both Houses of Parliament before it becomes law.
To conclude, this legislation is expected to happen in 2018
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