What does the grade number on a chain mean?
The number associated with the grade represents the maximum stress number in Newtons per millimeter squared for a given chain. So grade 70 chain can hold 700 Newtons per millimeter squared, and so on.
What is the difference between Chain Specification and grade?
Each specification outlines the different manufacturing and testing requirements as well as the appropriate performance standards, grades, and applications. Chain grades are a standard method for showing the ultimate breaking strength (tensile strength) of a chain. Grades help determine what sort of applications are appropriate for a given chain.
What is chain grading and why is it important?
Chain grading was originally put in place as a safety measure, and it’s based on the ultimate breaking strength of the chain in question. The number associated with the grade represents the maximum stress number in Newtons per millimeter squared for a given chain.
What is the difference between grade 30 chain and grade 120 chain?
The biggest difference between Grades of chain is that carbon steel chain (Grade 30, 43, and 70) is not recommended for overhead lifting, while alloy steel chain (Grade 80, 100, and 120) is recommended for use in sling assemblies and overhead lifting applications.
What is the grade of a chain?
What Are the Different Grades of Chain?
How Does Chain Grade Affect Price?
What is the difference between carbon steel and alloy steel?
Why is alloy chain used in lifting?
Why use a lower grade chain sling?
What is the DOT for cargo?
See 2 more
What does grade 70 chain mean?
Grade 70. Grade 70 chain is about 20 percent stronger than Grade 43. It is made from heat-treated carbon steel that is incredibly sturdy and durable. Grade 70 industrial chains typically come in a gold chromate finish for easy identification – as well as protection from abrasion and scratches.
Does grade 70 chain rust?
Grade 70 chain has a gold chromate finish to help resist corrosion from continuous exposure to the elements and the rigors of highway use, such as road salts in the winter.
How do you determine a chain grade?
Just look for the “L” and then the number after it. Each number following the “L” corresponds with a grade of chain. On grade 70 this can also show that the chains are DOT approved!
How strong is Grade 100 chain?
Grade 100. About 25% stronger than the chain rating 80, the chain Grade 100 is the strongest chain on most chain suppliers' markets. G100 is made of similar strong, alloy steel and can be used in a variety of jobs and industries including overhead lifting slings, construction, manufacturing, and rigging!
What is grade 30 chain used for?
General purpose economical chain. Used in a variety of industries and jobs including light construction, agricultural applications, and the marine industry.
Can grade 70 chain be used for towing?
Grade 70 Chain It is gold-colored but made of heat-treated carbon steel, and as a transport chain, is manufactured to meet DOT requirements. That said, it should never be utilized for overhead lifting; it can, however, be used for logging, towing, oil rigs, and as a safety chain.
What size chain is grade 70?
Grade 70 Transport Chain, Standard Link, Size 5/16 in., Working Load Limit 4,700 lbs., Part No. 609035. Chain Size: 5/16 in. Inside Length: 1.10 in.
What is a Grade 100 chain?
Grade 100 Chain is a Premium quality high strength alloy steel. Grade 100 Chain has a 20 percent increase in working load limit as compared to a similar size chain in Grade 80. This allows you to reduce the size of the chain depending on the working load needed.
What is the strongest steel chain?
Grade 120. Grade 120 chain exhibits the strongest tensile strength of all steel alloy chains and is used for exceptionally heavy overhead lifting.
What is the hardest chain to cut?
1:032:32Pewag Security Chain - The Toughest Security Chain - YouTubeYouTubeStart of suggested clipEnd of suggested clipMakes it so that there's an increased contact area making it more difficult to cut - the caseMoreMakes it so that there's an increased contact area making it more difficult to cut - the case hardening of the chain is 262 Rockwell well as conventional bolt cutters are somewhere between 59.
What is the difference between grade 80 and grade 100 chain?
In comparison to Grade 80, Grade 100 chain has a significantly higher strength-to-weight ratio—about 25% higher, depending on the manufacturer. Grade 100 chain also has a slightly harder surface material, which gives it some advantage when it comes to abrasion resistance.
What is a Grade 8 lifting chain?
The Grade 8 chain is embossed with manufacturer's mark and grade (MA8) and class leading batch code traceability. All sizes for the William Hackett Grade 8 are proof tested at manufacture to 2.5 times the given working load limit and have a range of diameters from 7mm - 32mm.
What is the breaking strength of grade 70 chain?
101,526 psiThe grade as advertised by chain manufacturers is 1/10 of the actual ultimate strength, which means Grade 70 chain has an ultimate breaking strength of 700 N/mm (or 101,526 psi).
What grade of chain is used for lifting?
Grade 80 chain is recommended by OSHA for overhead lifting applications and is most commonly used in sling assemblies. Other regulations can be found in ASTM A391 – Standard Specification for Grade 80 Alloy Steel Chain. In the majority of cases, either Grade 80 or Grade 100 chain can be used for a lifting application.
What is G70 steel?
G70 chains are made from a higher strength, heat-treated carbon steel and have a load rating approximately 20 percent higher than Grade 43. The gold chromate coating offers them more resistance to rust and corrosion. These chains have become the most common grade of chain used on flatbeds.
Can you use Grade 100 chain for transport?
While grade 100 chain is generally approved for overhead lifting, transport assemblies are not rated for overhead lifting due to the hook style. Chain and hooks are embossed with grade 100 markings for easy identification. All chain assemblies arrive fully assembled and ready for use.
Chain Grades Chart: Cargo Chain Strength and Grades Guide for ...
Also Read: Important Tips on Grade 70 Chain Usage Grade 80. The first chain on our chain number chart to be made of alloy steel chain, Grade 80 chain is the first suitable chain to be used as a sling for overhead lifting and heavy-duty towing. The unique alloy material makes this chain’s strength incredibly high, carrying a working load limit of 3,500 to 18,100 lbs!
Grade 80 Alloy Chain - The Crosby Group
Suerte en el test. No se preocupe, el test no está medido en tiempo, así que relájese y concéntrese en las preguntas y lo hará genial. Durante la prueba, puede hacer clic en el botón Revisar pregunta para marcar la pregunta en amarillo como un recordatorio visual para volver a visitar la pregunta antes de enviar las respuestas de la prueba. Al hacer clic en el botón de una pregunta ...
What is chain grade?
Chain grades are a standard method for showing the ultimate breaking strength (tensile strength) of a chain. Grades help determine what sort of applications are appropriate for a given chain. Chain grades are determined by calculating newtons per square millimeter, using the formula “N/mm 2 ”.
What is a 120 chain?
An ultra-premium high strength chain designed specifically for the rigorous requirements of overhead lifting applications. The links have a unique square shape and it has approximately 50 percent higher strength compared to Grade 80. There are currently no official standards for Grade 120 chain in the U.S. or Europe, however, it does meet or exceed the standards of Grade 100 chain.
What is a heat treated chain?
A high strength, heat-treated alloy chain that can be used as a sling component for overhead lifting as well as heavy-duty tow chain. The most economical choice that is suitable for overhead lifting.
Is there a standard for chain grade 120?
There are currently no official standards for Grade 120 chain in the U.S. or Europe, however, it does meet or exceed the standards of Grade 100 chain.
What is a grade 70 chain?
Grade 70 chain is manufactured in heat-treated carbon steel, and is generally used as a transport chain and for tie-downs on trailers and trucks. It is not approved for overhead lifting. It generally features a gold finish, which makes it easy to spot. It’s also a commonly used product in safety applications.
What is a 120 chain?
It’s a square link format, which reduces pressure on every part of the chain and can yield a work load limit up to 50 percent higher than grade 80 chain. Grade 120 chain has a bright blue finish, so like grade 70 chain, it will be easy to notice at first glance.
Is grade 100 chain better than grade 80?
Grade 100 chain provides about 25 percent higher work load limits than grade 80 chain, and is also approved for overhead lifting applications. It’s generally begun to replace grade 80 chain as the preference for flatbed load securing due to its increased strength, though its tie down chain is still not approved for overhead lifting.
Chain Grades
Graded chain is engineered to meet criteria for specific applications determined by:
But what do these grades mean?
Chain grades indicate the tensile strength in N/mm and what type of material is used to manufacture it. The tensile strength of a chain is based on its ultimate breaking strength. The force at which the chain breaks in tension (in units of N) is divided by the area of two crosssections of a single link (in units of mm).
Chain Finishes
As we discuss the different grades of chain in a moment, you’ll notice that there are specific finishes available for each chain. Here’s a quick summary of what they mean:
Grade 30 (System 3) Proof Coil Chain
Grade 30 chain (also called G30 chain or common coil chain) is an excellent general-purpose chain of standard commercial quality. It is frequently used for fabricating tow chains, binding or tie down chains, and logging chains.
Grade 43 (System 4) High Test Chain
Grade 43 chain (G43 of G-4) is designed for use in load binding, towing, logging, and other applications requiring high strength. It is made from carbon steel and is available in bright galvanized or zinc-plated finishes. Grade 43 chain is proof tested and should NOT be used in overhead lifting.
Grade 70 (System 7) Transport Chain
Grade 70 chain (G70) is used in load binding, towing, and logging and can be used in accordance with Department of Transportation regulations. The standard material used to manufacture these chains is heat treated carbon steel with no alloying elements included.
Grade 80 (System 8) CAM-Alloy Chain
Grade 80 chain (HA800) is specifically recommended for overhead lifting and is a more economical choice compared to Grade 100 (which we’ll talk about in a moment). Grade 80 is manufactured from heat treated alloy steel with a bright galvanized finish. Like the other chains discussed here, Grade 80 is proof tested.
What is the number after each letter in chain grades?
This number is what we see today G30, G43, G70, G80 & G100 and the common chain grades. The number after each letter is N/mm 2. For example, G80 means that the maximum stress on the chain at ultimate strength is 800 newtons per millimeter squared.
What grade chain is used for load securement?
The preferred chain for load securement is Grade 70, but any grade of chain can be used for tie downs or tensioning. You have to know your tensions in order to select the proper chain. Refer to load securement safety standards FMCSA (Federal Motor Carrier Safety Administration), CVSA (Commercial Vehicle Safety Alliance), WSTDA (Web Sling Tie down Association) or the state regulations for more information.
How much elongation does an alloy chain need?
ASTM states that alloy chain shall be able to elongate a minimum of 20% before fracture (7.3.5). To ensure that alloy chain consistently meets this requirement, ASTM requires the use of certain alloying elements in the manufacturing of the steel for alloy steel chain.
What is a chain used for?
It is one of the most versatile and reliable ways to lift, tension and tie down materials in a variety of applications. In the past, people would use any type of chain to lift something, tie down a load or tow a vehicle. Proper inspection, safety procedures and general standards of practice for chain were lacking.
Does a chain have to match the weight of the load?
The chain’s working load limit does not have to match the weight of the load. It needs to be able to handle the tension applied, which is based on the surface that it is being moved over plus some fraction of the weight of the load. This can be calculated using formulas.
Is grade 70 chain good for lifting?
This chain will elongate before breaking but does not have the properties needed for overhead lifting; therefore, Grade 70 chain is not intended for overhead lifting. ...
How to determine chain grade?
When determining which grade to give a chain, the biggest safety measure implemented was finding the ultimate breaking strength of the chain! Remember, chain grades are determined by calculating the newtons of stress per millimeter squared (N/mm 2 ). So, when determining a chain grade, reliable manufacturers will find the chain’s ultimate breaking strength and divide the number by .224805 to then find the chain grade.
How do you calculate a chain grade?
With several different ratings, you may be wondering: How do you calculate chain grades? A chain grade’s number or rating refers to the maximum stress it can handle per millimeter squared. If you were to make it a mathematical equation, it would look similar to the following:
What is load chain?
Load chains are constructed differently from alloy chains, which are what chain grades 80+ are crafted from. Load chains are specifically used within the inner workings of a hoist, which means that they don’t meet the same strength requirements nor hardness requirements that you might find with a Grade 80 or Grade 100 chain rating. If you mistakenly try to use a load chain for overhead lifting, you risk deforming if not completely snapping the chain, which can cause damage to the chain, the hoist, and your load! Load chains are not graded or prepped for the stress that overhead lifting can cause on-chain ratings over 80+ or made with alloy steel.
What is the strongest chain?
About 25% stronger than the chain rating 80, the chain Grade 100 is the strongest chain on most chain suppliers’ markets. G100 is made of similar strong, alloy steel and can be used in a variety of jobs and industries including overhead lifting slings, construction, manufacturing, and rigging! Based on the size of the links, G100 chains have working load limits of 4,300 to 22,600 lbs. It’s the absolute best choice for extremely heavy-duty lifting or towing jobs.
What is the working load limit of a chain?
The working load limit of a chain is significantly less than the weight that would cause a chain to fail (the tensile strength of a chain). A safety factor is a ratio between allowable stress and actual stress that the chain can withstand – the ratio between the chain strength and the expected maximum stress! When it comes to lifting and securement, factors like gravity and additional force – like sharp angles – should also be considered. It’s better to be safer than sorry, so spending a little more money on extra chains or a higher chain grade to ensure your chain limit isn’t less than your cargo’s weight can make all the difference! No matter what, always adhere to the WLL of a chain to ensure it doesn’t break or wear down fast.
How many Newtons per millimeter squared for a G70 chain?
Breaking down tow chain ratings using this equation, you could discover that a G70 chain can endure 700 Newtons per millimeter squared before bending, disfiguring, or breaking. Remember, the higher the grade, the higher the tensile strength is compared to the size of the chain links.
What is the maximum weight of a chain grade 70?
Chain Grade 70 has a working load limit between 3,150 to 15,800 lbs. They’re typically used by truckers and loggers for load securement and towing jobs, and have thus earned the nicknames of Transport and Trucker chain!
What is a chain used for?
Chain is a durable and versatile tool for lifting and is more commonly used for lifting goods in Australia than in other parts of the world, certainly more so than in Europe.
What is the difference between a 120 chain and a 80 chain?
It makes a big difference: Grade 120 chain has a 50% increase in working load limit compared to a similar size chain in Grade 80, allowing a reduced size of chain depending on the working load required.
What is welded chain?
Welded chain falls into two categories: 1. Carbon steel chain (most commonly used for tie down and container securement purposes and not recommended for overhead lifting) 2. Alloy steel chain (unlike carbon chain, all graded alloy steel chain is recommended for overhead lifting)
What is a 70 chain?
DESCRIPTION. Also known as transport chain, Grade 70 chain is designed for use as a tie down chain or lashing for transportation. It has a gold chromate finish to help resist corrosion from continuous exposure to the elements and the rigours of road use. It is too brittle for lifting.
What is grade 60 stainless steel?
Grade 60 stainless steel lifting chains and accessories can be used in different corrosive environments and at higher temperatures compared to normal lifting accessories. It is typically used in pump stations and marine environments.
Where are 140 and 160 chain systems developed?
These chain systems are being developed within Europe but the manufacturers are specifically targeting the Australian market.
What is the difference between carbon steel and alloy steel?
The biggest difference between Grades of chain is that carbon steel chain (Grade 30, 43, and 70) is not recommended for overhead lifting, while alloy steel chain (Grade 80, 100, and 120) is recommended for use in sling assemblies and overhead lifting applications.
Which is better, stainless steel or galvanized chain?
Stainless steel chain is less prone to rusting (and looks a lot better!) but it has a lower breaking point than galvanized chain
What is the difference between a proof coil chain and a windlass chain?
Constructed from low carbon steel. Proof coil chain doesn't have a uniform pitch and does not work with windlasses. It is hallmarked approximately every foot with the manufacturer's symbol and grade marking: 3, 30 or 300.
What is a G4 chain?
A short link chain of normal commercial quality. Constructed from low carbon steel. It has a uniform pitch short link and works well with gypsies. It used to be the standard for windlasses but it has largely been replaced by G4 Chain. It is hallmarked approximately every foot with the manufacturer's symbol and grade marking: 3B
What does the L on a chain mean?
On grade 70 this can also show that the chains are DOT approved! The “L” represents Laclede and our commitment to high quality chain products. You can also find the “LAC” stamp on some of our non alloy grab and slip hooks. The added marking on these hooks will help you identify that the hook is a Laclede product and from a Laclede verified source.
What is a trace code on a chain?
These types of chain have trace codes, a combination of numbers and letters usually in sets of 2 or 3, which provide information about the manufacturing history of the chain. A trace code can also identify the origin of the steel; you will only see a trace code on domestic chain.
What is the grade of a chain?
The number that indicates the grade of the chain is a representation of the solution to a mathematical equation. This equation takes the tensile force of the chain —measured in Newtons—and divides it into the cross-sectional area of the link size on that chain in millimeters.
What Are the Different Grades of Chain?
Welded chain comes in several different levels of strength, known as grades. Grade is especially important when it comes to the difference between carbon and alloy chain.
How Does Chain Grade Affect Price?
As a general rule, as the grade of chain increases, the more expensive the material and production process is —resulting in a higher price for the end product.
What is the difference between carbon steel and alloy steel?
The biggest difference between grades of chain is that carbon steel chain—Grade 30, 43, and 70—is not recommended for overhead lifting, while alloy steel chain—Grade 80, 100, and 120—is recommended for use in sling assemblies and overhead lifting applications.
Why is alloy chain used in lifting?
Alloy chain is recommended for overhead lifting because its higher strength-to-weight ratio provides a product that is capable of a much higher elongation percentage—20% minimum—before breaking when overloaded. Basically, higher chain grades correlate with stronger material and a higher resistance to bending or breaking in the event of impact or overloading.
Why use a lower grade chain sling?
When chain slings are used in bundling, a lower grade of steel is preferred because it is less likely to be attacked and damaged by acids. In many cases, shops with a caustic environment will not permit the use of alloy chain slings as they will be more easily damaged and destroyed by the harsh chemicals present.
What is the DOT for cargo?
Another organization to keep in mind when it comes to load securement and cargo is the Department of Transportation (DOT) and, by extension, the Federal Motor Carrier Safety Administration (FMCSA). The DOT allows for use of any graded chain for cargo securement as long as it meets the FMCSA cargo securement regulations.
