Product Spotlight | Lifting Magnets

Product Spotlight: Lifting Magnets

Lifting magnets, also known as magnetic lifters, or magnetic lifting systems, are a versatile piece of rigging equipment that can be used in a variety of applications ranging from lifting small metal pipes or scraps to large heavy metal blocks.

If your business deals with a lot of heavy ferrous metals (generall meaning, containing iron) it may be a good idea to invest in a lifting magnet! Most general permanent lifting magnets have a working load limit (WLL) ranging from 500 to 3,000 pounds, with some electromagnets reaching a WLL of 11,000 pounds – This offers an easy, efficient and cost-effective way to lift an array of metal loads.

Lifting magnets are commonly used in steel mills, scrap yards, loading docks, warehouses, foundries, shipyards, coil and pipe distributors, and other users of applicable steel products.

Types of Lifting Magnets

There are two basic types of lifting magnets – permanent magnets and electromagnets.

Permanent Magnets

Permanent magnets are exactly what you’d think- They’re permanent! What that means is that these magnets use materials that are permanently (or naturally) magnetized to establish the magnetic field. These are called ferromagnetic materials and are usually iron, nickel, or alloys that are made or rare-earth metals.

Fun fact: The main way that permanent magnets are created is by heating a ferromagnetic material to a key high temperature – Specific to each kind of metal. This is similar to the natural process that takes place inside the Earth which is what creates materials that are naturally magnetized.

The majority of permanent lifting magnets can be “turned on” and “turned off” by way of a lever. These magnets generally have two parallel poles which give the magnet a deep penetrating magnetic field for rougher flat surfaces and round pipe or shaft material. When both pole’s fields are lined up, with North to North and South to South, the magnetic field is activated, but when you pull the lever those fields are reversed which will cause the lifting magnet to let go of the load.

Electromagnets

Electromagnets, unlike permanent magnets, rely on electricity to charge the magnet and hold the load to the face of the magnet. This takes place by the use of an energized electrical coil wrapped around a steel core creating a magnetic field. This, of course, means the lifting magnetic depends on a constant power source, which also means a lack of access to power or a power failure can mean the equipment can’t be used.

A safety hazard to keep in mind when using electromagnets in the fact that If the electric current is interrupted, any load being hoisted would be released and dropped. Some electromagnets feature a battery that will protect against accidental loss of power or power outages.

Fully battery-powered magnets are also available which use a self-contained gel cell-type batteries. Battery-powered magnets can be moved from hoist to hoist, offering generous lifting capacity without an external power connection with only a need for periodic recharging.

The Advantages of Lifting Magnets

The three main advantages of lifting magnets are their ability to lift materials without needing to cause surface damage, their cost-saving benefits, and their level of efficiency.

And this is how…

Damage-Free Lifting: Like lifting clamps, lifting magnets provide a way to transport materials without needing to cause surface damage to the load, such as needing to drill a hole to place an eyebolt. They can also minimize the potential of causing scratches, holes, or dents in the material if the magnets are used properly!

Cost-Effective: Since you are able to perform lifts without causing any damage to the load, it results in a more cost-effective lift since there’s no need to then fill and re-finish said damage. It also can be a more costly lift, simply because of the time saved in its efficiency…

Efficiency: Beyond lifting loads with no damage, lifting clamps are also often used to pick materials that may not be accessible enough to properly attach other rigging equipment. For example, if you have a crate of tightly packed materials come in, you may be able to use a lifting magnet to access one part from the top and lift it out quickly and easily! If this crate was say, filled with pipes stacked horizontally, using a strap or chain to lift a single pipe would require one end of the part to be manually lifted in order to pass the strap or chain underneath – Which would at the very least take much more time – If not being totally impossible, impractical or unsafe.

5 Things to Keep in Mind When Using Lifting Magnets

Every type of lifting equipment has downfalls you need to keep in mind to ensure you’re rigging safe – And lifting magnets are no exception to that rule!

Above all, it’s imperative to have proper training on the correct use of ANY rigging equipment you come in contact with on the job. Once you have that base of knowledge, these are a few things you’ll want to be reminding yourself when using a lifting magnet.

1. Air Gaps

An air gap between the magnet and the load’s surface can reduce it’s holding performance. Magnetic lines of force pass easily through ferrous metals, but not air – Therefore anything that creates space or an air gap between the magnet and the lifted object will have a negative impact on the lifting capacity of the magnet. To get the best holding performance, air gaps must be kept to a minimum. You can determine the possibility of air gaps by looking at the profile of the load and its surface. Keep an eye out for things like thick paint, dust, chips, paper or packaging, rust, moisture or textured surface finishing which can all cause air gaps.

2. Magnet Contact to Surface 

Always ensure the entire magnet surface is making contact with the load during the lift. The lifting capacity of the magnet will be reduced in direct proportion to any amount of lack of contact with the material surface.

3. Material Being Lifted

Not all ferrous metals are made alike – Some contain non-magnetic materials that have a negative impact on the magnetic conductance. Heat treatments that affect the structure of the metal can also reduce the lifting capacity.

The lifting force percentage of various materials:

  • St37 (0,1-0,3% C) = 100% lifting force
  • Non-alloy steel (0,4-0,5% C) = 90% lifting force
  • Cast steel = 90% lifting force
  • Alloy steel F-522 = 80% – 90% lifting force
  • AISI430 (magnetic stainless steel) = 50% lifting force
  • Cast iron = 45% – 60% lifting force
  • F-522 tempered (60 HRC) = 40% – 50% lifting force
  • AISI304 (stainless steel/nickel) = 0% – 10% lifting force
  • Brass, aluminium, copper, etc. = 0% lifting force

4. Bending of the Load

If you’re lifting material with a single magnet such as a thin sheet, or something much wider then it is long, be conscious of the load bending and possibly, ‘peeling off’ the magnet. To combat this, thin sheets should be lifted with multiple magnets evenly distributed over the entire surface, and the magnet contact surface should always be in line with the lifted load, not perpendicular to its length.

5. Thickness of the Load

Think of magnetism as lines flowing from one material to the next, sticking them together – like a bunch of invisible nails. Have you ever tried to hang a photo on the wall with a nail and it fell right back out because the drywall wasn’t thick enough for the nail to properly be secured? Magnetism works very similar to that. Only if the load is sufficiently thick is it possible to utilize the magnet’s full capacity. Once this point is reached, a greater material thickness will not result in any additional lifting capacity. If the material you’re trying to lift is too thin, you won’t be able to use your lifting magnets full capacity.


Hercules SLR makes lifting magnets for a wide range of applications using permanent, electro-permanent, battery-powered, and electromagnetic technologies. Lifting Magnets are versatile, compact, easy to operate and can be used on flat and round material ranging from 0 to 11,000lbs. Our larger lifting magnets are designed for applications such as handling billets, bundles, bar stock, slabs, plates, structurals, long bar stock, rail, hot material, coils, pipe rebar, radioactive material, slag, and more.

NEED A QUOTE? HAVE A QUESTION? CALL US—WE KNOW THE (WIRE) ROPES & EVERYTHING RIGGING-RELATED.

Product Spotlight | What are Lifting Clamps?

Product Spotlight: What are Lifting Clamps?

What do you do when you need to lift a beam, pipe or piece of sheet metal with no lifting point? AND you’re told you’re not able to cause any surface damage to the material? Easy—You grab a lifting clamp!

Lifting clamps are used to latch onto plates, sheets, grinders, pipes and other materials for positioning, hoisting and transferring. This eliminates the need for creating a hitch or drilling into the material. When in use, lifting clamps use powerful springs that allow the clamp to essentially become one with the material being lifted (yes, it holds on THAT tight). Most often, lifting clamps are used on sheet, plates or fabrications— Because of this, many people know lifting clamps as ‘plate clamps’ or ‘sheet clamps’.

What are Lifting Clamps? | Types of Lifting Clamps

There are many different types of lifting clamps, but the majority of them fit within two categories—Vertical lifting clamps and horizontal lifting clamps. The following are some examples of lifting clamps sold by Crosby!

Hercules SLR sells Crosby lifting clamps with a variety of working load capacities and jaw opening sizes. Crosby lifting clamps are produced using advanced manufacturing techniques and are able to withstand abusive field conditions. Each plate clamp, beam lifting clamp, and drum clamp features a welded alloy steel body that is designed to have high-strength while still being lightweight and compact. Crosby lifting clamps are individually proof tested to two times the working load limit and you’ll always find the Crosby logo, working load limit (WLL), jaw opening, unique serial number, and proof load test date permanently stamped on the clamp bodies.

Vertical Lifting Clamps

Vertical lifting clamps are used for lifting, turning, moving or vertical transfer of sheet plates, or fabrications from horizontal to vertical and down to horizontal (180 degrees) as need.

  1. The IPU10 has a hinged hoisting eye which allows for the clamp to place and lift the load from any direction, or with a multiple leg sling without side-loading the clamp. The IPU10S is for use with stainless steel and the IPU10H is for use with materials with a surface hardness up to 47Rc (450 HB)
    • Available in capacities of 0.5 through 30 metric tons (higher WLL are available upon request).
    • Wide variety of jaw openings available from 0″ to 6.1″.
  2. The IPNM10N will not mark or scratch the material surface, making it suitable for materials such as aluminum, stainless steel, painted materials, aircraft skins, composite material, glass, and plastic.  The IPNM10P does this while also providing a protective cover that will reduce the risk of damage to surrounding plates.
    • Available in capacities of 0.5, 1 and 2 metric tons.
    • Wide variety of jaw openings available from 0″ to 1.57″.
  3. The IPU10A automatically clicks on to the material as soon as the clamp is placed on the plate. The safety lock will remain in position as the clamp closes precluding hazardous situations. This also allows the clamp to be easily fastened to difficult to reach areas.
    • Available in capacities of 1 and 2 metric tons.
    • Wide variety of jaw openings available from 0″ to 1.97″.

Horizontal Lifting Clamps

Horizontal lifting clamps have a pretension feature that allows users to attach the clamps to the material for horizontal lifting and transfer of non-sagging material. These clamps must be used in pairs or more.

  1. The IPHNM10 may only be used on material surfaces that have no damage and the IPH10 and IPH10E have spring-loaded tension.
    • IPHNM10 and IPH10 are available in capacities of 0.5 through 12 metric tons and IPH10E are 2.0 through 25 metric tons.
    • Jaw openings available from 0″ to 4.75″ (IPH10E only goes to 4.72″)
  2. The IPHOZ is used on thin sheets and other materials that will sag or bend when lifted.
    • Available in capacities of 0.75 through 15 metric tons.
    • Wide variety of jaw openings available from 0″ to 2.36″.
  3. The IPBC has clamps with a pretension feature that allows the user to attach the clamps to sagging and non-sagging materials. These clamps may also be used to handle material that will be used in shears, bending and rolling machines or other fabrication equipment. This clamp may also be used for turning beams from the “H” into the “I” position. IPHGZ and IPHGUZ have these capabilities and may also be used to move and life structural shapes such as I-Beams, H-Beams, etc.
    • Available in capacities of 1 through 4.5 metric tons.
    • Jaw openings available from 0″ to 1.57″.
  4. The IPPE10B(E) is suitable for use on bundles or unbendable sheets of metal. The jaw opening can be easily adjusted for the height of the bundle or the plate. It also has magnets in the footplate, allowing one person to operate multiple clamps at the same time when lifting loads. IPPE10BNM may be used for virtually all applications, where the objects that are being lifted or transported require optimal protection against surface damage.
    • Available in capacities of 3 and 12 metric tons.
    • Wide variety of jaw openings available from 0″ to 7.09″.

Specialized Clamps

Crosby also makes lifting clamps for further specialized uses such as beam lifting clamps, shipbuilding clamps, positioning screw clamps, pipe grabs, beam clamps, concrete road barrier grabs, granite curb grabs, and pipe hooks. If you’re interested in learning more in-depth information about these specialized clamps, email us or call us at 1-877-461-4876.

What are Lifting Clamps? Their Uses

  • The Mining/Quarrying Industry – Many extracting and maneuvering operations use lifting clamps capable of meeting the needs of extreme conditions found in everyday operations within the mining/quarrying industry.
  • Transportation/Towing Industry – Lifting clamps are used in the transportation & towing industry to load vehicles onto trailers, load finished products into containers, and transfer bulky items used in production and construction.
  • Construction Industry – Lifting clamps are on many materials within the construction industry such as fabricated building materials like iron sheets, heavy doors, windows, metals pipes, timber, floors or walls.
  • Steel Industry – You’ll likely find lifting clamps in most foundries and metalworking facilities as lifting clamps are used so much in this industry – The hardware is often known as a ‘plate clamp’ or ‘sheet clamp’ (as we’ve mentioned above), because of its use moving plates of steel.

Lifting Clamp Dos and Don’ts

Based on safety guidelines recommended by the Canadian Centre for Occupational Health and Safety (CCOHS), here are some easy dos and don’t to keep you and your load safe when using a lifting clamp.

DO

  • Select the correct clamp for the job – ensure you’re using the correct clamp for directional lifting (vertical, horizontal or universal) and that the clamp is rated for the thickness and weight of the materials being lifted.
  • Refer to the manufacturers’ operating instructions.
  • Inspect clamps visually before each use.
  • Lift one piece of material at a time unless using clamps and methods approved for otherwise.
  • Use two or more clamps to balance a long or flexible load (always use two or more if manufacture guidelines suggest).
  • Install the clamp(s) over the center of gravity of the load.
  • When using vertical lifting clamps, consider using a locking device to prevent accidental loosening.
  • Always use clamps within their rated capacity and flange width.
  • Ensure clamps are locked in place before lifting a load.
  • Use slings between the clamp and cranes or hoist hooks.
  • Use non-marring (rubber pad) clamps in pairs when lifting finished and polished plates
  • Lift smoothly and avoid jolts.
  • If the use of a tag line is necessary, attach it to the clamp before lifting the plate.

DON’T

  • Do not lift over workers and do not stand near a load – Position yourself away from a fully clear of the load. Remember to also consider how the load might fall when it lands.
  • No not overload or underload a clamp.
  • Do not lift from the side with a vertical-only clamp.
  • Do not attempt to lift materials from the bottom of a stack.
  • Do not drag the load using the lifting clamp.
  • Do not use a clamp having a minimum jaw opening larger than the thickness of the load.
  • Do not leave suspended loads unattended.

Lifting Clamp Inspections

Before using ANY rigging hardware, you should always perform visual inspections to ensure you aren’t using hardware that’s damaged or weakened, making it unsafe to use.

But, keep in mind these quick visual inspections should not and DO NOT replace any required annual inspections. Without inspections and maintenance, equipment failures can have a major effect on safety, unscheduled outages and your business costs. Hercules SLR has qualified technicians to inspect and repair your securing, lifting and rigging equipment on-site or in one of our full service, rigging shops. Our experienced and LEEA certified team will ensure that your equipment complies with ASME and provincial regulations. Staying on top of your required annual inspections has never been easier with the Hercules SLR team.

How to visually inspect the exterior of a lifting clamp

  • Always follow the hardware’s manufacturer maintenance recommendations.
  • Inspect internal and external surfaces for forging or weld fractures, wear or distortion.
  • Check all pin holes for wear.
  • Inspect the throat (clamp opening) width – At zero grip, the clamp should be in full contact with the pad.
  • Measure the width of the throat – If the measurement at the base (where the pad is located) is greater than at the top, the body has been overloaded and the clamp and tag need to be replaced.

Crosby is one of the most recognizable names in the rigging industry, and has been for over 100 years. Crosby makes over 2,000 rigging and lifting products to meet all your hoisting needs, and Hercules SLR is proud to be an Authorized Crosby Distributor and a Certified Crosby Repair Center.

See your Crosby gear from purchase, all the way to service with Hercules SLR’s extensive product selection, inspection & service team, asset management, testing and more.


NEED A QUOTE? HAVE A QUESTION? CALL US—WE KNOW THE (WIRE) ROPES & EVERYTHING RIGGING-RELATED.

Rigging in Space | SpaceX Uses Crosby 

Rigging in Space: SpaceX Uses Crosby 

Rocket science—Pushing the boundaries between new technology and old technology.

Whether you’re familiar with the ins and outs of rocket science or not, you probably have some idea of its complexity. Rocket science has even become slang for anything overly complex, detailed or confusing—With “It’s not rocket science” becoming a popular way of saying that something isn’t very complex.

But, did you know that even the rocket science industry depends on rigging hardware and technology in order to successfully see their work come to life?

SpaceX, Elon Musk’s Company, has gained worldwide attention for a series of historic milestones. It’s the only private company that has returned a spacecraft from low Earth orbit, which it first accomplished in 2010. The company made history again in 2012 when their Dragon spacecraft became the first commercial spacecraft to deliver cargo to the International Space Station.

Even a record-breaking company like SpaceX relies on the tried and true technology of rigging. Crosby wide body shackles were used on the recent SpaceX Starship lift near Brownsville, TX, to join the two halves of the spacecraft together.

SpaceX operates the world’s only operational reusable orbital-class rockets and spacecraft designed to carry both crew and cargo to Earth orbit, the Moon, Mars and beyond. Once complete, this star-ship will be the world’s most powerful launch vehicle ever developed. It will have the ability to carry in excess of 100 metric tonnes into Earth’s orbit.

Unfortunately that prototype, the Starship MK1, partially exploded during a pressurized test conducted by the SpaceX team late last month. It erupted at its tip, sending vapor and shrapnel flying into the air—You can check out the explosion here, captured on YouTube.

However, as stated by SpaceX a few hours following the test, “The purpose of today’s test was to pressurize systems to the max, so the outcome was not completely unexpected…There were no injuries, nor is this a serious setback.”

They’re wasting no time jumping into the next model, the Mk3, so there will surely be lots of record-breaking updates to come in this saga of futuristic space exploration!


Nobody knows what the future of space exploration holds—But something we can always be sure about is Crosby. The Crosby brand has been trusted for more than 130 years as the world’s leading manufacturer for rigging, lifting, and material handling applications.

Crosby delivers the industry’s most comprehensive portfolio of products, engineered to exceed the toughest demands—Even when faced with lifting a SPACESHIP!

Hercules SLR is proud to be an Authorized Crosby Distributor and a Certified Crosby Repair Center. See your Crosby gear from purchase, all the way to service with Hercules SLR’s extensive product selection, inspection & service team, asset management, testing and more.


NEED A QUOTE? HAVE A QUESTION? CALL US—WE KNOW THE (WIRE) ROPES & EVERYTHING RIGGING-RELATED.

CROSBY QUIZ: Can you Pass this Hook Inspection Quiz?

crosby quiz, hoist hook inspection at hercules slr

CROSBY HOOK HOIST INSPECTION

TAKE THE CROSBY QUIZ

So you think you know how to inspect a hoist hook? Prove it. Take the Crosby Quiz and find out if you’re a  pro at inspecting hooks for hoisting, or if you should get some more training. 

It’s important to know what makes a hook no longer safe to use – there are a number of factors that contribute to this, and aren’t always glaringly obvious like it being broken or crooked.

Hooks that don’t pass inspection can cause the load to release, and this can result in damaged materials, injured workers or legal consequences. It’s important to conduct inspections before you use the sling – each time

Take the Quiz from Crosby and find out if you’re a hook inspection pro, or if you have a bit more to learn. 

Wear in the area indicated is limited to _____?

The Crosby Group.®
Correct! Wrong!

Wear in the circled areas is limited to _____ of cross sectional area?

The Crosby Group.®
Correct! Wrong!

Wear in the areas indicated are limited to _____ of cross sectional area?

Per ASME B30.10, you should remove any hook from service with a throat opening that's increased by _____. Or, as the manufacturer recommends.

The Crosby Group.®
Correct! Wrong!

According to ASME B30.10, if a hook has _____ twist, remove the hook from service immediately.

Correct! Wrong!

This hook should be removed from service, because:

Correct! Wrong!

ASME B30.10 gives rejection criteria for hoist hooks - this includes:

Correct! Wrong!

CROSBY QUIZ: So you think you can Inspect a Hoist Hook?
100%
Wow, are you a LEEA certified inspector?! You know exactly when a hoist hook should be removed from service.
83%
Wow, you're good - almost an expert! A little hands-on experience will help make you even better.
67%
So close - you're almost there! A little rigging, and you'll be an expert in no time.
50%
Not quite a fail, but not quite a pass either... You definitely have some work to do! You definitely don't have your ASME B30 standards memorized, but with a little work and training, you'll get there.
33%
Yikes... Only 2 correct. Hopefully you're not responsible for rigging or inspecting hoists!
17%
Only 1 right... Please tell us you're not a rigger. Time for training!
0%
None right. Head back to rigging school!

Share your Results:


ASME STANDARDS

There are ASME Standards that apply to rigging, and more specifically, hooks for lifting. Although they’re not law themselves, these standards are important to know as they’re directly quoted in Canadian legislation. Be sure to check the manufacturer warnings, usage instructions and other recommendations that may apply to the equipment you’re using. 

ORIGINAL ARTICLE REPRINTED WITH PERMISSION VIA THE CROSBY GROUP.

 

 


Hercules SLR is part of the Hercules Group of Companies which offers a unique portfolio of businesses nationally with locations from coast to coast. Our companies provide an extensive coverage of products and services that support the success of a wide range of business sectors across Canada including the energy, oil & gas, manufacturing, construction, aerospace, infrastructure, utilities, oil and gas, mining and marine industries.

Hercules Group of Companies is comprised of: Hercules SLRHercules Machining & Millwright ServicesSpartan Industrial MarineStellar Industrial Sales and Wire Rope Atlantic.

We have the ability to provide any solution your business or project will need. Call us today for more information. 1-877-461-4876. Don’t forget to follow us on FacebookTwitter and LinkedIn for more news and upcoming events. 

Crosby Guest Blog: Shackle Inspection & Care

crosby shackles

CROSBY SHACKLES 

Crosby shackles are a popular option for lifting applications. Time-tested and work proven, Crosby has made their mark in rigging—they’ve produced the first wire rope clip, quench and temper fittings (this makes performance more reliable) and were the first to fatigue-rate products. Their shackles are particularly popular – read on to learn more about Crosby shackles and how to use them safely, a handy interactive inspection checklist and more tips for best use. 

CROSBY SHACKLES: 3 MAIN SHACKLE TYPES

Round pin shackles can be used for lifting applications and others like tie down, towing or suspension applications when the load’s strictly applied in-line.

Screw pin shackles are used for pick and place applications. Pick and place applications are when a load is moved to its desired location, and the screw pin is tightened before each pick.

Bolt-type shackles can be used in any applications that round pin or screw pin shackles are used. They’re also great for long-term or permanent installations where the load may slide on the pin, which causes it to rotate. The other way to secure a shackle includes using a nut and cotter, which eliminates the need for you to tighten the pin before each lift or movement. 

CROSBY SHACKLES: USE THEM SAFELY  

Before you put your Crosby shackle in service, make sure your shackle’s in good condition. To do so, look for these conditions:

  • The shackle’s pin works freely and fits correctly. 
  • The pins are undamaged, have no considerable wear and fit properly from the opposite side of the shackle. 
  • The load line and jaw opening are aligned.
  • The pin is always seated and is ‘matched’ to the body.
  • The shackle is the right material, size and type for the proposed lift.
  • Shackles are stored in a dry, cool place.

CROSBY SHACKLES: INSPECTION 

It’s important to inspect your rigging equipment frequently. Ideally, this happens before use, during (check for points of stress or tension during use) and after use. Inspection is important to prevent equipment failure, which can lead to damaging the load entirely, or worse—injure or kill workers’. 

Check your shackle before use. If any of these conditions are present, remove your shackle from service and have it inspected, repaired or replaced. 

  • The shackle’s jaws or pins are distorted.
  • The shackle isn’t stamped with is safe-working load (SWL).
  • The shackle is home-made (never use homemade shackles).
  • The shackle’s pin does not work freely, or fit correctly in the shackle’s opening. 
  • The pins’ threads are damaged, worn down or don’t easily screw in from the opposite side of the shackle. 
  • The unthreaded hole is enlarged – a hole too big places unnecessary strain on the loaded shackle. 
  • The shackle has wear that’s reduced its diameter by more than 8% of its original diameter. To test for cracks that may be hidden, tap them with a hammer. A shackle in good-condition should ‘ring’ clearly.
  • The shackle’s pin has been replaced, especially if it’s been replaced with anything but a pin. 

CROSBY SHACKLES: USE THEM SAFELY OR NOT AT ALL 

There are a few things to keep in mind when using shackles for securing and lifting applications. 

  • When you use shackles in conjunction with multi-leg slings, you must give consideration to the angle between the legs of the sling. 
  • As the angle increases, so does the load in the sling leg, and as a consequence, any shackle attached to the leg. 
  • Try to avoid erratic loading of the shackle – to do this, place a loose spacer on either end of the shackle’s pin, or use a shackle with a smaller jaw. 
  • If using a shackle to secure the top block of a rope block set, the load on the shackle is increased by the value of the hoisting effort. 
  • Take care to make sure the shackle and assembly above the hook is the right capacity. 
  • It’s important that on shackles fitted with a nut and bolt pin, the length of the bolt’s plain portion will cause the nut to jam on the inner end of the thread, and not on the shackle’s eye. This leaves the bolt free to rotate.
  • Be sure the bolt and nut are cross-drilled for the fitting of a split cotter pin. 

FOR MORE INFORMATION ON CROSBY PRODUCTS,

CHECK OUT OUR BLOGS:

CROSBY QUIZ: CAN YOU PASS THIS HOOK INSPECTION QUIZ?

GUEST BLOG: CROSBY TALKS FORGED WIRE ROPE CLIPS VS MALLEABLE CAST IRON CLIPS

RIGGING HARDWARE WE LOVE: CROSBY® 4-50 CLIP APPLICATIONS


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Have questions about Crosby products? Hercules SLR will lift you to the answers.

Click here to learn more about Crosby at Hercules SLR. 

Hercules SLR is part of the Hercules Group of Companies which offers a unique portfolio of businesses nationally with locations from coast to coast. Our companies provide an extensive coverage of products and services that support the success of a wide range of business sectors across Canada including the energy, oil & gas, manufacturing, construction, aerospace, infrastructure, utilities, oil and gas, mining and marine industries.

Hercules Group of Companies is comprised of: Hercules SLRHercules Machining & Millwright ServicesSpartan Industrial MarineStellar Industrial Sales and Wire Rope Atlantic.

We have the ability to provide any solution your business or project will need. Call us today for more information. 1-877-461-4876. Don’t forget to follow us on FacebookTwitter and LinkedIn for more news and upcoming events

Guest Blog: Crosby Talks Forged Wire Rope Clips VS. Malleable Cast Iron Clips

crosby wire rope clips at hercules slr

FORGED STEEL WIRE ROPE CLIPS VS. MALLEABLE CAST IRON CLIPS

What’s the difference between wire rope clips? Guest blogger Danny Bishop, Director of Training for Crosby stopped by Hercules SLR is here to share some information about the difference between malleable cast iron and forged U-Bolt clips.

Read on to discover his expert tips for rigging with U-Bolts. 

 

crosby rigging, hercules slr

 

 

 

 

 

 

 

U-Bolt style wire rope clips are one of the most commonly used accessories in the world of rigging. They can be found in many lifting and non-lifting applications.

Some common applications include winch lines, crane hoist lines, suspension cables, barrier cables, guy wires and many more applications. However, it is critical that the user know there are differences between a forged steel wire rope clip and a malleable cast iron clip.

The forged steel wire rope clip consists of a U-Bolt, two nuts and a forged steel base, which is sometimes called the saddle.

The malleable cast iron U-Bolt style wire rope clip consists of the same components as just mentioned except the clip base is NOT forged steel. In fact, it is a malleable cast iron, and that can make a big difference in the performance and reliability of the clip. The malleable cast iron base does not have the desirable material properties of steel, or the beneficial grain structure that a forged base provides. Although, malleable cast iron products have their place in industry, it is not the manufacturing process of choice for wire rope clip bases. This is especially true if the wire rope clip could be used in a critical application.

Notice that some standards do not allow the use of malleable cast iron clips in critical applications. One example would be ASME B30.5 which states that “Wire Rope Clips shall be drop-forged steel of single saddle (U-Bolt) or double saddle clip. Malleable cast iron clips shall not be used. “ASME B30.26 also states: “Saddles shall be forged steel.”

Additionally, shortcuts in the production process of the bases may also indicate there could be other shortcomings of the product. In some recent testing of malleable cast iron clips, it was found that U-Bolts fractured prior to achieving the recommended forged U-Bolt Clip torque, on 2/3 of the assemblies tested. (See picture of test mentioned).

Also consider:

  • Malleable Cast Iron Clip bases are significantly different from forged bases in size, shape and appearance. See figure 1 to compare a Crosby forged clip base and a Malleable Cast Iron clip, both for ½” wire rope. 
  • Malleable Cast Iron bases are inconsistent in strength, and can have hidden defects. 
  • Malleable Cast Iron clips should not be used for critical applications.
wire rope clips, hercules slr rigging services
Figure 2

 

 

 

 

 

 

 

 

 

 

 

crosby wire rope clips at hercules slr

 

 

 

 

 

 

Note the significant difference in size, shape and appearance even though both are 1/2″ diameter for wire rope. Also, the Crosby clip exceeds ASME B30.26 marking requirements. No readable markings were found on the malleable cast iron clip. 

HERCULES SLR: CROSBY BRAND


Hercules SLR is part of the Hercules Group of Companies which offers a unique portfolio of businesses nationally with locations from coast to coast. Our companies provide an extensive coverage of products and services that support the success of a wide range of business sectors across Canada including the energy, oil & gas, manufacturing, construction, aerospace, infrastructure, utilities, oil and gas, mining and marine industries.

Hercules Group of Companies is comprised of: Hercules SLRHercules Machining & Millwright ServicesSpartan Industrial MarineStellar Industrial Sales and Wire Rope Atlantic.

We have the ability to provide any solution your business or project will need. Call us today for more information. 1-877-461-4876. Don’t forget to follow us on FacebookTwitter and LinkedIn for more news and upcoming events.