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12mm ISO Lofrans Grade 40 Calibrated Anchor Chain
12mm ISO Lofrans Grade 40 Calibrated Anchor Chain
12mm ISO Lofrans Grade 40 Calibrated Anchor Chain

Lofrans are renowned worldwide for their range of quality windlasses.

ISO4565: 12mm x 36mm pitch

Hallmark stamped LFR at regular intervals

Test Certificate available

Select a continuous length up to 300 metres


Price per metre

More Information

12mm ISO4565 Grade 40 Calibrated Anchor Chain from Lofrans, renowned worldwide for their range of quality windlasses.

Lofrans Grade 40 12mm ISO4565 is clearly stamped LFR at regular intervals as testimony to their belief in the quality of their chain

12mm ISO4565 Grade 40 Anchor Chain is generally suitable for yachts over 14 metres and up to approximately 20 metres, length overall

Factor in:
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

There is one main calibration for 12mm chain - ISO4565 12 x 36
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
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 Lofrans 12mm ISO4565 = approximately 375mm

Calibrated Chain, How Jimmy Green can help

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
12mm Lofrans ISO4565 pitch tolerance is Plus 0.6mm or Minus 0.3mm

Maximum Pin Diameter = 13mm = the largest pin which will fit comfortably in the end link of 12mm ISO chain

Select the largest possible galvanised shackle or anchor connector by pin diameter to fit the chain.

Lofrans Chain Diagram

Lofrans 12mm ISO 4565 Calibrated Chain Dimensions:
Size/Calibration A B C D
12mm ISO4565 12.0mm 36.0mm 39.6mm 15.6mm
Lofrans 12mm ISO 4565 Calibrated Chain Specification:
Size/Calibration WLL PL MBL ABL
12mm ISO 4565 2400kg 48.0kN 96.0kN 99.2kN

WLL = Working Load Limit
PL = Proof Load
MBL = Minimum Break Load (required)
ABL = Actual Break Load

1Kn Force = 101.972Kg Break Load

MBL 96.0Kn = approximately 9789kg

12mm ISO4565 Calibrated chain weighs approximately 3.2kg per metre

Jimmy Green 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

A copy of the corresponding Lofrans Test Certificate is available with your order on request

Sample 12mm ISO Lofrans Test Certificate

Lofrans Galvanising Advisory
Occasionally new chain may have little marks which look like the galvanising is missing.
However, hot dip galvanising is not a coating but a chemical fusion.
The process is explained in detail in this article: HOW GALVANISING WORKS  
These flaws are therefore most likely caused by a tiny bit of impurity contamination in the galvanising process.
Lofrans attest that these blemishes will not have a detrimental affect on the effectiveness or longevity of the galvanising on their chain.
The picture below shows a single mark on this Lofrans galvanising:
Lofrans galvanising flaw

  • Purchase Type - Per metre
  • Chain Size - 12mm
  • Chain Finish - Hot Dipped Galvanised
  • Boat Length (Anchoring) - 16-18 metres up to 20 tonnes
  • Boat Length (Anchoring) - 18-20 metres up to 25 tonnes

Chain Markers

Chain Markers

Quick Link
Chain Rivet Link - stainless steel
Maillon Rapide, stainless steel rated link

Osculati Chain Connecting Rivet Link, 8 pins
Force 7 Grade 70 anchor chain shackle link, showing all three sizes