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Calibrated Anchor Chain Quality Control

World renowned chain manufacturers

Jimmy Green Marine policy is to purchase G3 Grade 40, G6, G6+ and Grade 70 calibrated chain from world renowned brands and manufacturers:
MF Catenificio Frigerio, Lofrans, Titan, cromox and William Hackett Ltd.


Every single length of chain purchased by Jimmy Green Marine is marked and recorded with the supplier, the date received and a Jimmy Green batch number.

The Jimmy Green Team record the appropriate batch number on each individual order for chain. Every purchase of chain is therefore traceable back to the manufacturer and the accountability trail is clear.

Every single length of chain has a manufacturer certificate of conformity - Test Certificate. The specific Test Certificate for your purchase is therefore recorded and available to you if required.


Each length of chain is measured accurately along the floor of the chain store. Each order is checked by a second member of the team before it is cut.

Jimmy Green Marine purchase some chain from the manufacturer already cut to length e.g. 50m, 60m 80m and 100m MF DAMS Grade 70 - this is not normally measured again, but supplied on trust.


Each length of chain is checked by eye for any signs of defective galvanising when it is received from the manufacturer and again when it is measured out for an order.

Proof Loading

Every link undergoes a proof load as part of the manufacturing process ensuring that every single weld is completed satisfactorily.


Each manufacturer undertakes a minimum galvanising thickness measured in microns.

Galvanising is a chemical process and the surface condition (appearance) is not always indicative of the effectiveness of the galvanising treatment.

A bright or dull finish is not indicative of the galvanising quality - newly galvanised chain has a bright zinc finish but exposure to the elements will soon remove the shine.

Staining is quite common, even from the outset, on introduction to a marine environment, due to toxic contamination. This requires monitoring.

Regular washing in fresh water is advisable. Cleaning agents may be helpful depending on the impurities involved.

Rust is the enemy.

White deposits are normal.

Patches of darker grey/black colour can be a little unsightly but if no brown rusting appears the galvanising is still effective

This article has more in depth information on the Galvanising Process

This article has more in-depth information on what to expect from your galvanising Galvanising Performance and Endurance

More information on Calibration:

Calibrated Anchor Chain Information

How to establish the correct calibration

Purchase your anchor chain: