Welded steel chains are widely used in industry, construction, in the home and for a host of other uses. Many different types of chains exist with different intended functions and levels of strength and durability. In order to give people in need of a chain a guide from which to decide which kind of chain suits their needs the best, the National Association of Chain Manufacturers provides a set of specifications which help people to understand the sort of functions for which a particular chain is intended. Becoming aware of these specifications will help you to make an educated decision when shopping for a new chain.
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Grades 100 & 80 Alloy Chain
A chain specified as Grade 100 Alloy is the premium quality, strongest chain available. These chains are intended for slinging and tying down other objects. The Grade 80 Alloy specification refers to chain that is slightly less strong than Grade 100 chain, and is intended for similar uses. Alloy chain is the only type of chain that can be used for overhead lifting.
Grade 70 Transport Chain
Chain specified Grade 70 Transport is intended for securing loads only. It cannot be used for overhead lifting.
Grades 43 & 40 High Test Chain
Grade 43 High Test chain is used in a wide variety of applications and industries, and is built from carbon steel. Grade 40 High Test Chain is designed to be strong and durable, and is used mostly for hauling or heavy duty trucking.
Grade 30 Proof Coil Chain
Grade 30 Proof Coil Chain is a general purpose carbon steel chain. It is used in many different ways, including as log chain, cargo lashing chain, pipeline hanging chain and tow and switch chain.
Machine chains are a general utility chain made from carbon steel.
Coil chains come with two different types of chain links, straight link or twist link, and are also made from carbon steel.
Passing Link Chains
Passing link chains are constructed so that the links are resistant to bunching, kinking or tangling. They are also made of carbon steel.
Stainless Steel Chain
Stainless steel chain is often used when the chains will be exposed to high levels of moisture.
Working Load Limit
The Working Load Limit (WLL) of a chain refers to the maximum amount of weight which the chain can be expected to carry.
Minimum Breaking Force
The Minimum Breaking Force is the smallest level of force required in order to break the chain. This figure arises through testing while the chain is being manufactured.
Chain dimensions are important specifications when dealing with welded chains. They are usually arrived at by either measuring one link or measuring 100 links and then dividing that number by 100. Another important dimension is the diameter of the material from which the chain is constructed.
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