Industrial chains are the most used for overhead lifting, towing and tying downs applications, because they are extremely strong, super durable and flexible, in this article we will explain what and how to choose the chain grade for your rigging applications.
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What is chain Grade?
In the past, people may use any type of chain, but in recent years, the ASTM (American Society of Testing & Materials), ASME (American Society of Mechanical Engineers) and OSHA (Occupational Safety & Health Administration) have began to publish safety standards and regulations for the manufacturing, testing, use, inspection and repair of chain to differentiate between various materials and grades of chain and the specific applications they should be used for.
According to the Standards, the chain grade&#;s number or rating refers to the ultimate breaking strength it can handle per millimeter squared. There are five grades of chain: G30, G43, G70, G80, and G100. Grade 120 is a more stronger chain with a a bright, blue-coat finish and rectangular links, designed to fit the most extremely heavy duty application, but it is less common in the rigging industry. The higher the number, the stronger and the higher the WLL is, and the higher the strength-to-weight ratio.
You may heard &#;Grade 80 Alloy chain,&#; &#;Grade 70 chain&#;, &#;Grade 43 chain&#; or &#;Grade 30 chain&#; but don&#;t know what they meaning. It&#;s important to know the Grades of chain, for each Grade of chain is in several different strengths, and different applications, you can easily know which is better, for the higher numbers the grade is, generally there are six Grades of Chain and into three main steel materials: Grade 80 chain, Grade 100 chain, and Grade 120 chain for overhead lifting uses, Grade 70 chain for load securement and tie down applications, and Grade 43 chain and grade 30 chain for flatbed trucking industry .
Type of chain Grades
Grade 100 chain, and Grade 120 overhead lifting chain
They are both made of high strength, heat treated alloy chain.
but the Grade 120 chain is a high-performance alloy chain, with square links, as opposed to the Grade 100 chain rounded links. We don&#;t sell these chain grades on our website, you can always send us an to order them.
In the majority of cases, either Grade 80 or Grade 100 chain can be used for a lifting application. However, there are some situations in which Grade 80 is the better choice.
Grade 80 chain is made of heat-treated alloy steel, in some situations the Grade 80 chain is the better choice than Grade 100 chain for it has a high strength to weight ratio.
You can easily identify Grade 80 chains for they are embossed with G8, or 80 marks, they can be used for overhead lifting and chain slings, Hilifting can supply EN818-2, EN818-4, and ASTM or NACM Grade 80 alloy chain, please click here for more details.
Grade 70 transport chain is a binder chain for load securement, towing, logging and tie down applications. It is easy to identify for the golden chromate finish and embossed G7, or 70 marks.
It is not approved for overhead lifting, although it is manufactured by heat-treated making them high strength, the galvanization degrade its grade. If you need more details, please click here.
They are both made with low carbon steel but Grade 43 high test chain has a higher strength-to-weight ratio than Grade 30 proof coil chain, both of them are used in the bundling, logging trucking, and tie down applications, but are not approved for overhead lifting.
Grade 30 Proof Coil Chain
Different Chain Grades&#; Size & Working Load Limit Charts
Grade 30Nominal Chain SizeWorking Load
Limit (MAX.)Proof Test
(Min.)Breaking Force
(Min.)Inside Length
(Max.)Inside Width
(Max.)IN.MMLBSKGLBSKNLBSKNIN.MMIN.MMhltG/8&#;..20..90.256.4hltG/16&#;5...40..80.37.7hltG/4&#;..21..50.389.8hltG/16&#;..81..80..2hltG/8&#;..21..hltG/16&#;11...81..60..6hltG/2&#;..50..2hltG/8&#;..62..hltG/4&#;..62..hltG/8&#;..23...5hltG&#;..23..91..7Grade 43Nominal Chain SizeWorking Load
Limit (MAX.)Proof Test
(Min.)Breaking Force
(Min.)Inside Length
(Max.)Inside Width
(Max.)IN.MMLBSKGLBSKNLBSKNIN.MMIN.MMhltG/4&#;..61..50.389.8hltG/16&#;8...80..2hltG/8&#;..hltG/16&#;11...60..6hltG/2&#;..61..50..2hltG/8&#;...hltG/4&#;..42..hltG/8&#;..63...5Grade 70Nominal Chain SizeWorking Load
Limit (MAX.)Proof Test
(Min.)Breaking Force
(Min.)Inside Length
(Max.)Inside Width
(Max.)IN.MMLBSKGLBSKNLBSKNIN.MMIN.MMhltG/4&#;..50.389.8hltG/16&#;8...61..80..2hltG/8&#;..41..hltG/16&#;11...41..60..6hltG/2&#;..81..50..2hltG/8&#;..82..hltG/4&#;..22..Part No.Chain Dia.PitchInner WidthOuter WidthApprox WeightW.L.LP.LM.B.Ld(mm)p(mm)a(mm) Minb(mm) Maxkg/mtonstonstonshlt±0.±0.57.822.20.81.122.804.48hlt±0.±0.69.125.91.11.503.756.00hlt±0.±0.710.429.61.42.005.008.00hlt±0.430±0..23.157..60hlt±0.±1.216.948.13.85...20hlt±0.±1.420.859.25.78...00hlt±0.954±1.623.466....80hlt±12.560±1....00hlt±1.166±2.028.681.410.815...00hlt±1.378±2.333.896.215.221...80hlt±1.696±2.941....00
Conclusion
The alloy steel chain Grade 80, 100, 120 are designed for overhead lifting, not for bundling, logging applications, while carbon steel Grade 70, 43, 30 chain are for load securement, tie downs, and bundling applications, not for overhead lifting purposes.
We hope that this article help you have a base level understanding of what chain grade and the differences of chain grades. We also carry a variety of galvanized, stainless steel chains, please contact us or leave your comment below and if you are interested in learning more about chains knowledge.
Whether you transport machinery, use tow chains, or are in the logging industry, it's important to know the working load limits of chain you are using. Chains have a working load limit- or WLL- of approximately one third of their break strengths (the amount of force the chains can withstand before they break).
How to Find the Working Load Limit
The chain grade and diameter determines the working load limit of the chain. Chain is embossed with both the grade and size so you can determine its WLL using this chart.
For more Grade Alloy Steel Chain Wholesaleinformation, please contact us. We will provide professional answers.
Types of chain
Grade 30 Chain
Grade 30 is a multipurpose, economical chain. Also known as Grade 30 Proof Coil Chain, people use this product in a variety of industries and jobs, including light construction, barrier chains, and in the marine industry. It is not safe for overhead lifting. Grade 30 chain is embossed using a 3, 30, or 300.
Grade 43 Chain
Also called Grade 43 High Test Chain or Grade 43 Tow Chain, this is common in the towing and logging industries. Never use this chain for overhead lifting. This chain includes designs embossed using a 43 or a G4.
Grade 70 Chain
Grade 70 Transport Chain, also called "Grade 70 Truckers Chain," works in securing loads for over-the-road hauling.Never use this chain for any overhead lifting. This chain include designs embossed using a 7, 70, or 700.
Grade 80 Chain
Grade 80 Alloy Chain works for overhead lifting due to its heat-treated design. People commonly use this type of chain as a heavy duty tow chain. Grade 80 chain include designs embossed using an 8, 80, or 800.
Grade 100 Chain
Considered premium quality chain, it offers about a 25% higher work load limit over Grade 80 chain. It is safe for overhead lifting. Grade 100 chains includes designs embossed with a 10 or 100.
Grade 120 Chain
A newer product in the market, Grade 120 chain is up to 50% stronger than Grade 80 chain and 20% stronger than Grade 100 chain. It's also more resistant to abrasion than both Grade 80 and Grade 100 chains. It's safe for overhead lifts.
LEARN MORE:
Learn more about the differences between grades 70, 80 and 100 here: What are the Differences Between Grade 70 Chain, Grade 80 Chain, and Grade 100 Chain?
You can also learn more about load binders and the types of transport chain.
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