3.15 TON HAMMERLOCK FITTING
- 3.15 TON WORKING LOAD LIMIT
- SUITS 10MM T GRADE CHAIN
All pig trailers with rigid drawbars (with or without breakaway brakes but excluding converter dollies) and, any other trailer without breakaway brakes, must be fitted with safety chains that are marked in accordance with the relevant Australian Standard complying with the following:
• trailers that do not exceed 2500 kg ATM 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: Safety chains up to 3500kg capacity', or be a safety cable with a certified load capacity of the same
• trailers over 2.5 tonnes and not exceeding 3.5 tonnes ATM must have two safety chains of designation of 3500 kg complying with Australian Standard AS 4177.4-1994 or Australian Standard AS 4177.42004
• trailers over 3500 kg ATM must have two safety chains made from steel of a minimum 800 MPa breaking stress that conforms to the mechanical properties of Grade T chain as specified in Australian Standard AS 2321-1979 'Short Link Chain for Lifting Purposes (uncalibrated)' or Australian Standard AS 2321-2006 'Short Link Chain for Lifting Purposes.'
Each chain must be sized such that the minimum breaking load exceeds the ATM. The length of the safety chain/s must prevent the trailer’s drawbar hitting the ground if the trailer is detached from the towing vehicle.
The safety chains must be properly connected to the tow bar with attachments capable of withstanding the specified breaking load of each chain. Do not use padlocks.
For further information regarding couplings, brake requirements and safety chains please refer to the Vehicle Standard Bulletin - Building Small Trailers (VSB1) available on the Department of Infrastructure and Regional Development website (www.infrastructure.gov.au)