Also called grade 43 high test chain or grade 43 tow chain this is common in the towing and logging industries.
G4 chain breaking strength.
Its working load limit is nearly twice that of bbb chain and it has the highest weight to working load ratio.
Lower chain grades g30 and g43.
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1 2 g4 has a working strength of 9 200 pounds.
Grade 43 chain is embossed using a 43 or a g4.
The wll wroking load for chain is usually defined of the ubs ultimate breaking strength expressed in pounds for all chain types except g4 grade 40 htchain has the wll defined as 1 3 of the ubs.
Chain grades what does g30 g43 g70 g80 g100 and g120 mean.
And a breaking strength of 27 600 pounds.
Medium tensile chain is g4 or g40 tensile strength of 400 mpa.
The interesting thing to note is that the breaking strength is 3x grater than the working load giving this type of chain a significant safety margin but still a smaller margin of safety when compared to bbb.
Ht chain is widely used because of its strength to link factor.
In other words it allows the use of a thinner link which means more chain can be stored in a given chain locker.
Breaking strength exceeds that of high test g4 chain 30 stronger than standard grade a shackles depending on sizes forged hot dip galvanized coating on both the shackle and pin working load limit size and logo stamped on every shackle bold black colored pin proof tested load rated bow anchor and d chain types.
This type is also referred to as grade m in australia.
High tensile chain is that made of steel with a tensile strength much above 500 mpa.
Chain is graded based on the ultimate breaking strength of the chain measured in n mm 2 the american society of testing materials astm has published safety standards and regulations for these chain grades.
It is unclear why the wll definition is different for grade 40 chain.
It is not rated safe for overhead lifting.
Our anchor chain shackles are strong enough to use with hi test chain just pick one size larger than the chain.
Since 1968 west marine has grown to over 250 local stores with knowledgeable associates happy to assist.
The working load limit called out on our anchor shackles is 1 6th of the breaking strength vs the ratio of 1 5th for the grade a shackles.
See chart for astm specification number.
