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                                        LOAD BINDERS            


Failure to follow warnings and instructions can result in serious injury or death. Read important warnings and information in preceding General section as well as following Fittings section.
  • Never exceed the Working Load Limit.
  • Read the following warnings, as well as the warnings here and those in the Fittings section.
  • Do not operate the binder while you or anyone else is on the load. You might slip or fall risking serious injury or death.
  • When applying the binder, always position the load binder so the handle is tightened in a downward manner. Failure to do so may result in a sudden snapping back of the lever which might result in serious injury or death.
  • Load binders are designed to be tightened to the approximate Working Load Limit by a substantial hand effort. Do not use a handle extension. Extensions can severely damage the binder system and result in serious injury or death.
  • The operator should at all times use the load binder from a firm standing position that will ensure protection for himself as well as those in the immediate vicinity.
  • Load binders are a form of machinery and require periodic inspection and maintenance. Inspect for wear, deformation, cracks, nicks or gouges before using. Replace if damaged.
  • Load binders should be periodically lubricated to give optimum performance and reduce friction losses.
  • Consult the U.S. Government Printing Office for the Federal Motor Carrier Safety Regulations for additional important information, specifically S 392.9 (relating to safe loading), S 393.100 (relating to protection against shifting cargo) and S 393.102 (relating to strength securement systems).


  • In releasing lever type binders, be sure no one is positioned to be struck by the handle which may release suddenly.
  • If there is a possibility for a relaxation of the chain when the binder is in the locked or "over center" position, the handle should be secured to the binding chain by securely wrapping the loose end of the chain around the handle. Whenever possible, secure the handle down with a positive retaining method.

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Failure to follow warnings and instructions can result in serious injury or death.

Refer to the General Warnings above.

These warnings also apply to fittings. Only additional warnings and information are listed below.

Never exceed the Working Load Limit.

The Working Load Limit is the maximum load which should ever be applied to the product, even when the product is new and when the load is uniformly applied - straight line pull only. Avoid side loading. All catalog ratings are based upon usual environmental conditions, and consideration must be given to unusual conditions such as extreme high or low temperatures, chemical solutions or vapors, prolonged immersion in salt water, etc. Such conditions or high-risk applications may necessitate reducing the Working Load Limit. Working Load Limit will not apply if product has been welded or otherwise modified.

Match components properly.

Make certain that components such as hooks, links or shackles, etc. used with wire rope (or chain or cordage) are of suitable material and strength to provide adequate safety protection. Attachments must be properly installed and must have a Working Load Limit at least equal to the product with which they are used.

Keep out from under a raised load.

Conduct all lifting operations in such a manner, that if there were an equipment failure, no personnel would be injured. This means keep out from under a raised load and keep out of the line of force of any load. Do not operate load over people. Do not ride on loads.

Avoid shock loads.

Avoid impacting, jerking or swinging of load as the Working Load Limit could be exceeded and the Working Load Limit will not apply. A shock load is generally significantly greater than the static load.

Inspect products regularly.

No product can keep operating at its rated capacity indefinitely. Periodic inspections help determine when to replace a product and reduce rigging hazards. Check for visible damage, cracks, wear, elongation, rust, corrosion, etc. When in doubt about the extent of the damage, retire the item in question immediately.

Destroy, rather than discard, items that have been judged defective.

They might be used again by someone not aware of the hazard associated with use.

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Read important warnings and information below and preceding Fittings section. Failure to understand and follow the instructions outlined below can result in serious injury or death.


1. Turn back specified length of rope from thimble and apply first clip one saddle width from seized dead end. Tighten nuts evenly to specified torque. Important: seat "live end" of wire rope (load carrying part) in saddle and position u-bolt over "dead end."
2. Apply second clip close to the thimble without binding on it. Turn on nuts firmly but do not tighten yet to recommended torque.
3. Apply all other clips, equally spaced between first two clips.
4. Apply light tension and tighten all nuts evenly to specified torque.

5. Recheck and re-tighten nuts after initial load. This load should be at least equal to loads expected in general use. Wire rope will stretch slightly causing a reduction in diameter which will slacken the clips. Nuts must be checked at frequent intervals for tightness to assure efficiency of termination.

If the specified number of clips are applied according to these instructions, they will develop approximately 80% efficiency of right lay wire rope of classes 6x19, 6x36, 7x19, 8x19, 19x7 and cable-laid. Add at least one additional clip if thimble is not used or if clips are used on other wire ropes than those mentioned above. Check with wire rope manufacturer if in doubt. If more clips are used than specified, the amount of wire rope to be turned back has to be increased proportionately.

Caution: Never use any wire rope clip to directly connect two straight lengths of wire rope. Failure to apply wire rope clips as specified or failure to retorque nuts periodically can result in load release or failure of the assembly resulting in injury or death.

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CAUTION: NEVER EXCEED THE WORKING LOAD LIMIT. Read important information below and here. READ THE FOLLOWING WARNINGS AND SAFETY INFORMATION CAREFULLY. EVEN EXPERIENCED PERSONNEL NEED TO UNDERSTAND THIS INFORMATION. Failure to follow warnings and instructions can result in serious injury or death.

Blocks are devices used for lifting or lowering loads, or for changing direction of the pull on the line. They consist of a sheave, two side plates, and an end fitting which is either a hook with a latch or a shackle.


Improper use or set-up of a block system can cause a load to slip or fall, resulting in serious injury or death.

A block assembly should always be rigged by someone with training and experience in designing and assembling these systems. If you do not understand how to rig properly or how to operate block systems, seek professional assistance.

Also, the following statements should always be followed in order to prevent serious injury or death:

  • Keep out from under a raised load.
  • Stay out of the line of force.
  • Keep hands and body away from block sheaves, hooks and shackles.
  • Keep hands and clothing away from "pinch points" where the rope meets or touches block parts or loads.
  • Do not side load blocks.
  • Never lift personnel with a hook block.
  • Always be alert in areas where loads are lifted or moved with block assemblies.



A number of potential hazards exist when working with blocks. These hazards can cause serious harm to both humans and property. However, these hazards can be avoided if the block systems are assembled, used, and maintained properly. The following directions should ALWAYS be followed in order to prevent serious injury or death.

  1. Always make sure that the hook supports the load. The latch must NEVER support the load.
  2. Always check for wear or damage before rigging block systems. Check for cracks, rust, corrosion, deformation, intentional alterations, chips, warps, or any other physical signs of damage or wear. When in doubt about the extent of wear or damage to a product, take the product out of service immediately. Only laboratory tests can determine the fitness of a damaged or worn part. Thus, you may not be able to tell whether a part with any amount of damage is safe to use. Discard any part that appears worn or damaged.


  1. Know and follow OSHA rules.
  2. Know the weight of the load and the line pull required.
  3. Make sure that the correct wire rope grade and diameter is used. Consult Wire Rope product page for information.
  4. Never exceed the Working Load Limit (WLL). The Working Load Limit indicated is the greatest force or load a product can carry under usual environmental conditions. Shock loading and/or extraordinary conditions must be taken into account when selecting products for block systems and especially in determining the Working Load Limit for a specific application.
  5. The Working Load Limit of a product is affected by many factors. Among these are: Overloading, misuse, intentional abuse or alteration, corrosion, deformation, operation in extreme environments, and simply wear. In order to determine whether the product can continue to be used at the published WLL, regular inspections must be performed. These inspections also will determine whether a product must be withdrawn from service.
  6. Avoid side loading blocks. These products generally are intended for tension or pull. Side loading must be avoided, as it exerts additional force or loads which the product may not be able to withstand.


In order to ensure peak efficiency and extended service life it is necessary that blocks be inspected and maintained at frequent intervals. Consider the following points:

  1. Inspect products for any signs of wear or damage. These include:
    • Worn sheaves, bushings, side plates, pins, hooks, or shackles.
    • Hook latch for proper fit and operation. Deformed latches must be replaced.
    • Deformed side plates, pins, hooks, and shackles. Worn, deformed or damaged parts of the block and any other part used in the assembly must be replaced. If necessary, the entire assembly needs to be removed from service.
  2. Blocks supplied by Edwards Wire Rope are furnished with bronze bushings. This type of bushing is not self-lubricating. These blocks are intended for infrequent and intermittent use with low line speeds. Follow this lubrication schedule as a minimum.
    • Moderate use: Every 8 hours.
    • Intermittent operation: Once a week.
    • Rotate sheave during lubrication process.


Throughout this catalog the term Working Load Limit is used. It refers to the maximum load or force which a product is designed to support in general service when the pull is applied in-line. There are, however, other terms used in the industry which are interchangeable with the term Working Load Limit. These are:

  • WLL
  • SWL
  • Safe Working Load
  • Rated Load Value
  • Resulting Safe Working Load
  • Rated Capacity

Other terms applicable, such as Shock Load, Proof Load, and Design Factor are discussed in detail in the General Warnings section.


The total load on the snatch block, and therefore also on any fitting which is attached to the block, is usually considerably greater than the actual load lifted. The deciding factor in determining the total load on the block is the angle between the lead line and the load line.

Multiplication Factors for Snatch Blocks*
Line Angle
Line Angle
Line Angle


*Use these multiplication factors for single line systems only.


A load weighing 4 tons is pulled straight up. Observe how the TOTAL LOAD on the block differs when the angle between the lead line and the load line changes.

The truck shown at right is lifting a 1000 lb. weight.

Load on block A: 1000lbs. x .92 = 920 lbs.

Load on block B: 1000lbs. x 1.77 = 1770lbs.


Using rope of different size than the one for which the sheave is grooved is potentially dangerous and will cause rapid wear of both sheave and rope.


Check general condition of block componenets. Look for wear on sheave grooves, sheave pins, wobble of sheave, security of bolts and nuts, etc. Make sure sheave rotates freely and lubricate grease nipples frequently.


The smaller the ratio of sheave diameter to rope diameter the larger the reduction in rope strength efficiency compared to the Catalog Breaking Strength, and the more rapid the resulting wear on sheave and wire rope fatigue. Avoid changing the bending direction from one sheave to another, as this will rapidly accelerate rope fatigue.

D: sheave pitch diameter / d: wire rope diameter


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Failure to follow warnings and instructions can result in serious injury or death.

Refer to General Warnings and Information here.

These warnings also apply to cordage (rope). Only additional warnings and information are listed below.

Never exceed the Working Load Limit of rope.

Use Working Load Limits as published as guidelines only. Working Load Limit may have to be reduced when life, limb or valuable property are at risk, or other than new rope is used. When using multiple leg rope slings, the Working Load Limit of each leg will have to be reduced considerably. Consult industry recommendations for information such as published by the Cordage Institute. Working Load Limit does not apply if rope has been subjected to severe dynamic loading, which may not be visible.

Avoid overheating.

Exposure to high temperatures will cause ropes to lose strength rapidly. Even temperatures as low as 150° F (66° C) can reduce the strength of some ropes by 50%. When using synthetic rope (especially polypropylene) on a capstan or a winch, be careful to avoid excessive friction which heats, melts and fuses the outer fibers of the rope. Avoid repeated surging or hard rendering around poles or over cross arms. Polyester rope resists overheating best because its melting point is highest.

Attachments must have at least the same Working Load Limit as the rope used.

Hooks, links, shackles, etc. must be of suitable material and strength to provide adequate safety protection. Splice rope properly and use thimbles if applicable.

Choose rope to match gear or gear to match rope. Sheaves, pulleys, thumbles, etc. that do not match the size of rope being used can cause dangerous friction, abrasion, overload, etc.

Keep out from under a raised load.

Do not move load over people. Do not ride on load. Conduct all lifting operations in such a manner that if equipment were to fail or break, no personnel would be injured. This means KEEP OUT FROM UNDER A RAISED LOAD, DO NOT OPERATE LOADS OVER PEOPLE AND KEEP OUT OF THE LINE OF FORCE.

Avoid shock loads.

Rope that is strong enough to withstand a steady pull can be broken with a sudden jerk. Be aware of all possible dynamic loading situations. Avoid them when possible and allow for strong enough rope when they cannot be avoided. Keep in mind that the effects of dynamic loading are greater on shorter ropes than on longer ones and greater on low elongation ropes (such as Manila and polypropylene) than on high elongation rope (such as nylon). Never stand in the line of rope under strain. If the rope breaks it will recoil with considerable force, especially if it is nylon.

Inspect rope frequently.

Closely examine entire length of rope for damage to determine general condition and detect localized wear. Excessive abrasion, fusing of outside fibers, hockles, rust or other chemical stains, broken fibers or other obvious damage to rope are reasons to retire rope from service. Internal damage can be assessed by twisting strands open and checking for powdered fiber. Rope that is suspected of having been exposed to severe shock loads or loads close to its catalog Breaking Strength should be retired immediately. Such damage may not be visible. Actual remaining strength of damaged rope or used rope can only be established by laboratory analysis and tension tests.

Destroy, rather than discard, rope to be retired.

It might be used again by someone not aware of the hazard or defect. This is best achieved by cutting it up into short pieces.

Rope Slings

Refer to OSHA standard 1910.184 and ASME standard B30.9 for design factors and other important information. Other standards and information may apply in specific applications.




Avoid abrasion and unnecessary wear.

Outer fibers as well as inner fibers contribute to a rope's strength. When outer fibers are worn by chafing or dragging over splintered, rough or gritty surfaces, the rope is worn and weakened. When rope is used on cleats, winchheads, etc. make sure they are smooth and use chafing gear if necessary.

Avoid sharp angles and bends.

Sharp angles greatly affect the strength of a rope. Any sharp angle or bend is a weak spot. Use thimbles or chafing gear or padding where possible. Knots are also weak spots. They can reduce strength by as much as 50% or more. Use splices instead. Splice rope correctly. When a small section of rope has been worn or damaged, cut out the section and splice it together. Splice in extra tucks for synthetic fiber ropes. Use proper splicing procedures as outlined by the Cordage Institute. Do not resplice rope that broke due to being overloaded - discard it instead. Its remaining strength will only be a fraction of the Working Load Limit when new. Prevent unraveling of rope - whip or tape cut ends.

Avoid sustained loads.

Fiber ropes subjected to heavy loads for long periods of time can break well below catalog Breaking Strength. Natural fiber ropes such as Manila and Sisal have less ability to take sustained loafs than synthetic fiber ropes such as nylon or polypropylene. Never exceed the Working Load Limit and do not subject fiber rope to sustained loads for more than two days.

Avoid rust.

All ropes, synthetic or natural, should be kept away from rusting iron or steel. Rust can cause rapid loss of strength, sometimes in as short a time as one to two weeks. If ropes become rust stained, inspect the extent of the stain. If it is halfway through the rope, then rope strength may be reduced by as much as 50%

Keep rope away from chemicals.

Even though synthetic rope is generally considered to be resistant to damage from oils, gasoline, paint and most chemicals, exposure to any of these may cause some damage. Avoid contact with such things as storage battery solution, washing compounds or solutions, and animal wastes. Strong acids, alkalis and solvents can damage any rope. Natural fiber rope is extremely vulnerable to all chemicals and solvents.

Avoid the use of swivels in ropes under load.

A loss of turn will cause permanent damage to the rope.

Never use a nylon line which has a high stretch factor in combination with another rope of low stretch.

The nylon line will stretch and not carry its proportionate share of the load, thus putting extra strain on the other lines.

Reverse ends of the rope periodically.

Especially in tackles and winches, reverse the rope end-for-end periodically so that all sections will be worn equally. Also, using a line in one direction over a winch many times can also damage the rope by twisting it too tight or untwisting it so that hockles occur. Kinks pulled through a restricted space such as a tackle block, can seriously damage rope fibers. The initial use should be in a clockwise direction, then reverse the rope periodically.

Slack off guys in wet weather.

When ropes are used as guy lines or other supports exposed to weather, they should be slacked off in wet weather, or damage to the rope, as well as what it is supporting, may result.

Store rope properly.

Rope is best stored in a dry, unheated place where air circulates freely, off the floor and away from direct sunlight and other contact with the elements. Keep in mind that synthetic ropes will deteriorate in direct sunlight due to exposure to ultraviolet radiation. Light colored polypropylene especially is severely affected, smaller diameters more so than larger sizes. Natural fiber ropes (Manila and Sisal) will deteriorate in storage even under ideal conditions.

Dry rope properly.

Whenever natural fiber ropes become wet they should always be thoroughly dried before they are stored or they will rot in a very short time. Do NOT dry synthetic fiber rope in direct sunlight.

Keep rope clean.

Dirt on the surface of the rope can become embedded inside and act as an abrasive on fibers. When rope gets dirty, wash it thoroughly with clean fresh water. Remember to dry natural fiber rope before storing.

Remove rope from coils and reels properly.

Regular right hand laid rope should be uncoiled in a counter clockwise direction.

Coiled rope: Lay the coil on the floor with the inside end at the bottom, then reach down through the center and pull the inside up through the coil.

Reeled rope: Remove the rope from a reel by pulling it off the top while the reel is free to rotate. Rope should never be taken from a reel lying on its end because it is more likely to kink or hockle or pull yarns on the wooden flange.

When substituting natural fiber rope with synthetic fiber ropes (or substituting one synthetic rope for another) substitution should not be made on a straight breaking strength-for-breaking-strength basis only. Other important factors must be considered.

Consult the Cordage Institute for additional information.