After "google" search about chain manufacturers and chain markings, I'd like to be sure what the marks on my chain mean.
I've got 50 feet of silver colored 5/16" chain that has these marking every six links........"PM" and "M3" alternating every six links.
This must be grade 43 chain made by Peerless with a WLL of 5,400 lbs...I guess. After 164 pages of their catalog, I couldn't find the key to their identification.
Cheers,
Mike
About Chain Grading
Chain strength is identified throughout our website by
Working Load Limits* (WLL) - the higher the WLL, the stronger the chain.
Chain Strength Chart
(Working Load Limit WLL Comparison Chart)
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 3 feet or less on sizes over 5/16" with manufacturer's symbol and grade marking: 3, 30 or 300. Not for overhead lifting.
More info: Order Here Specifications Here
BBB Anchor Chain
A compact (short) link chain of standard commercial quality. Made from low carbon steel, this chain is used primarily for boat windlasses when hot galvanized. Hallmarked every link with "3B". Not for overhead lifting.
More info: Order Here and Specifications
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" on every link. Not for overhead lifting.
More info: Order Here and Specifications
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 1 to 3 feet with manufacturer's symbol and grade marking: 4, 40, 43 or 400. Not for overhead lifting.
More info: Order Bulk Here Order Assemblies Here Specifications Here
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 1 to 3 feet with manufacturer's symbol and grade marking: 7, 70 or 700. Not for overhead lifting.
More info: Order Bulk Here Order Assemblies Here Specifications Here
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 no more than 3 feet apart with manufacturer's symbol and grade marking: 8, 80 or 800.Suitable for overhead lifting.
More info: Order Bulk Here Order Assemblies Here Order Slings Here Specifications Here
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 no more than 3 feet apart with manufacturer's symbol and grade marking: 10 or 100. Listed as suitable for overhead lifting.
More info: Order Here Order Slings Here Specifications Here
*WLL is sometimes called Safe Working Load (SWL)
THE MEANING OF CHAIN GRADE NUMBERS
The chain grade numbers which manufacturers use are actually one tenth of the actual grades. Therefore, our grade 80 is 800, grade 70 is 700, and so on.
Just for the sake of accuracy , what is the WLL etc. of this chain?
