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5/16 US Specification (8.7mm) AQUA4 Calibrated Anchor Chain is generally suitable for yachts up to approximately 12 metres, length overall
Displacement : Length ratio
Your cruising intentions
The anticipated anchorage conditions e.g. depth, seabed holding characteristics, the length of fetch and degree of exposure to prevailing winds
The length of chain that will be deployed and any extra scope provided by an anchor warp
The weight and design of anchor
Your anchor rode is only as strong as the weakest link so ensure that all your connectors and shackles are rated to the requisite break load
5/16 US Specification (8.7mm) AQUA4 Grade 40 Calibrated Anchor Chain, manufactured, hot dip galvanised and proof tested in house, at the Maggi Catena factory in Italy
It is very important to check the size and calibration of your gypsy/chain before you order
If you are unsure we can help you to decide - we will take all reasonable steps to ensure you get the correct chain
A copy of the manufacturer test certificate is available with your order on request
The simplest way to check that you are buying the correct calibration is to take a measurement from your existing chain, providing of course that it fits correctly.
We measure 10 links because, in practice, it is difficult to measure one link accurately enough.
The links should be laid out flat and pulled tight.
Measure from the outside edge to outside edge.
Compare your measurement with our stock:
Jimmy Green 8mm DIN766 = approximately 250mm
Jimmy Green 10mm DIN766 = approximately 295mm
If your chain falls between the measurement for 8mm DIN766 and 10mm DIN766, it may be 5/16" US Specification.
This is 8.7mm chain with a 26.1mm pitch:
US Specification and Calibration
The length for 10 links of 5/16" US will therefore be approximately 275mm-280mm (26.1 x 10 Plus 2 x 8.7 = 278.4)
How to determine the correct calibration
N.B. The measurement for an old chain may be a little longer than new due to a degree of wear and elongation in use
5/16 US pitch tolerance is Plus or Minus 0.6mm
5/16 US Dimensions
|Chain Size (D)||Inside Width (B)||Outside Length (L)||Pitch (P)|
5/16 US Specification
|Maximum Pin Dia.||Proof Load||Break Load||Weight per metre|
Every link is tested to the proof load during the manufacturing process ensuring that each weld has been completed successfully
1Kn Force = 101.972Kg Break Load
52Kn = approximately 5300kg
Maximum Pin Diameter refers to the largest pin which will fit in the end link of 5/16 US Specification 8.7mm chain
Select the largest possible galvanised shackle (or anchor connector) by pin diameter to fit the chain
A copy of the Maggi Catena Test Certificate is available with your order on request
Quality Control and Accountability
Every length of chain is checked and labelled with the manufacturer, the date received and a corresponding batch number when it arrives.
The batch number is then recorded at the point of sale.
Every chain order is therefore traceable and accountable to the manufacturer Test Certificate.