Gr 30

Proof Coil

A general purpose chain of standard commercial quality.  Made from low carbon steel, this chain is frequently used for fabricating tow chains, logging chains and, when appropriate, tie down or binding chains. Hallmarked every foot or so with manufacturer's symbol and grade marking: 3, 30 or 300. Not for overhead lifting.

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Gr 40

High Test

Strength levels are the same as Gr 43 but the dimensions of the chain links are smaller using ISO standards. Primarily used for boat windlasses this grade has become a standard for that industry. The Grade 40 designation was exclusively used by ACCO Chain until 2005 to designate their High Test grade chain. They now use "43" in keeping  with the rest of the industry.  The chain is hallmarked "G4". Not for overhead lifting.

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Gr 43

High Test

This is a higher strength chain used for years in the trucking industry for tie downs that meet DOT specifications. Made from a higher carbon steel, its strength surpasses proof coil working load limits, size for size, by a factor of 2 to 1. Hallmarked every foot or so with manufacturer's symbol and grade marking: 4, 40, 43 or 400.  Not for overhead lifting.

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Gr 70

Transport

As its name implies Transport Chain is used primarily to tie down loads on over-the-road equipment. The  yellow chromate (gold) plating makes it easily recognizable even from a distance. Made from heat-treated carbon steel it has about 25% more strength than high test chains. Hallmarked every foot or so with manufacturer's symbol and grade marking: 7, 70 or 700.  Not for overhead lifting.

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Gr 80

Alloy

The first chain specifically designed for safety and approved by OSHA and other agencies for overhead lifting.  Its alloy, heat-treated steel makes it ideal for making lifting slings and heavy duty tow chains.  Hallmarked every foot or so with manufacturer's symbol and grade marking: 8, 80 or 800.Suitable for overhead lifting.

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Gr 100

Alloy

This new innovation in alloy chain metallurgy provides about 25% higher working load limits over Gr 80 chain with some limitations reported in lower ambient temperatures.  Hallmarked every foot or so with manufacturer's symbol and grade marking: 10 or 100.  Listed as suitable for overhead lifting.

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