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There has been a bit of discussion and controversy recently about "Rated D Shackles" and while there is no specific rule in relation to the attachment of safety chains to towbars safety should always be the primary concern.
Robert
This is an exerpt from a Queensland Government advisory which helps with the discussion.
Safety Chain Connections (Shackles, Pins or Bolts)
The Department of Transport and Main Roads (Queensland) recommends that the shackles used should meet Australian Standard AS 2741-2002 “Shackles”, or another equivalent recognised standard, and have a break load limit of the shackle is rated at least 1.5 times greater than the ATM of the trailer.
You can easily identify a shackle that meets AS 2741-2002 “Shackles” because they will be permanently marked with the following information: • The manufacturer’s name or trademark • Quality grade of the shackle, e.g. (“M” or “4”, “S” or “6”) • Working Load Limit (WLL) or Rating; and • Identification marking in order to correlate shackle to test certificate
• Rated bolts, chain shackles or other suitable fittings (i.e. hammerlocks) may be used as devices for connection on safety chains providing the break load limit of the device is at least 1.5 times greater than the ATM of the trailer.
• Generally, the break load limit of a rated shackle will be six times greater than its (WLL) work load limit.
• Pin diameter of shackle will be greater than the diameter of the main shackle body.
• Same size shackles of different quality grades will have a different WLL (i.e. 6mm “S” grade shackle has a greater WLL than a 6mm “M” grade shackle).
• Stainless steel shackles are unsuitable for trailer use due to the material’s general low resistance to bending stresses.
• S” or “6” grade “D” Shackles bear similar characteristics to “S” or “6” grade Bow Shackles
• Bow shackles provide for greater angular usage compared with “D” shackles
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