14.1 Wire-Rope Clips and Permitted Terminations
Key Takeaways
OSHA 1926.251 prohibits clip-formed sling or bridle eyes.
For conventional U-bolt clips, the saddle bears on the live rope.
Use the actual manufacturer table rather than universal spacing or torque values.
Identify whether clips are permitted
Wire-rope clips clamp a rope’s returned end to form certain permitted terminations. Their suitability depends on the application, rope construction and manufacturer instructions. The CCO blueprint’s clip topic does not waive OSHA restrictions: 1926.251 prohibits forming sling or bridle eyes with wire-rope clips or knots. Determine the intended rope use before discussing how to install a clip.
An approved rope termination on particular equipment is different from a field-made lifting sling. Personnel-platform wire-rope eyes also have specific requirements. Do not use a clip assembly wherever an eye is needed merely because its calculation appears adequate. The applicable regulation and equipment instructions must permit the termination.
Use the identified clip type and material specified for the application. Common lifting-equipment guidance calls for appropriate forged products rather than unapproved malleable utility clips. Avoid claims that visual forge marks alone establish grade, rating or shock resistance. Identification and manufacturer documentation determine what the product is.
Orient a U-bolt clip correctly
For a conventional U-bolt clip, the saddle bears on the live rope and the U-bolt bears on the dead returned end. The live rope is the continuing load-bearing part; the dead end is the returned tail. This orientation distributes bearing appropriately on the live portion.
Do not alternate orientation to “balance” the clamp. Both strands may appear connected, but placing the U-bolt on the live line can damage the principal load-bearing rope. Double-saddle clips use their own installation instructions and should not be described as identical U-bolt products.
| Installation input | Source to use |
|---|---|
| Clip size | Actual rope size and permitted construction |
| Minimum number | Manufacturer’s table for the product and rope |
| Turnback length | Manufacturer’s specified eye and tail arrangement |
| Spacing | Actual product instructions |
| Torque | Specified value and tightening procedure |
| Retightening | Manufacturer’s initial-load and subsequent-check instructions |
There is no universal table of clip count, torque or exactly six-diameter spacing valid for all sizes and brands. Obtain the exact installation chart for the identified product.
Follow the complete tightening sequence
Manufacturer instructions specify clip placement near the tail and eye, installation of intermediate clips, tightening and any initial-load retorque process. The rope can settle or change diameter as tension develops. Required retightening is part of the approved termination procedure, not an optional step after a production lift.
Apply torque with the correct tool and method where specified. More torque is not necessarily safer; it can damage parts or crush the rope. Lubrication conditions may affect the specified torque and must match the instructions. Do not add an extension handle to compensate for uncertain numbers.
A thimble may be required or appropriate to preserve the eye’s bearing geometry. Its size and fit must suit the rope and connection. An undersized thimble or forced fitting can create local bending even when the clips were installed correctly.
Efficiency is not a sling rating
A termination efficiency describes the fraction of rope breaking strength retained under stated conditions. It is product and rope dependent. Some clip terminations are rated around 80% under their specified assembly conditions, while others have different data. Do not state that every clip arrangement has one exact efficiency.
Even a known efficiency does not establish WLL by itself. The approved equipment design, design factor, rope rating and operating conditions must determine allowable use. A field calculation dividing adjusted breaking strength by an arbitrary number does not authorize a prohibited sling eye.
Installation-data example
Assume an approved application’s manufacturer chart requires three clips, a stated turnback and a stated torque. The crew has only two clips available. Increasing torque on two does not satisfy the chart or create an equivalent termination. Supply the correct parts and complete the prescribed installation before use.
Inspect and preserve the arrangement
Check clips for identification, cracks, deformation, corrosion, damaged threads, missing nuts and correct placement. Inspect the rope for crushing, broken wires and movement at the termination. Marking or inspection methods can help identify slip where specified, but a visual mark does not replace the required assembly procedure.
Do not use damaged clips, substitute nuts or mix parts without manufacturer approval. If the termination has moved or its installation cannot be established, stop use and obtain authorized assessment. Retorquing a damaged or prohibited assembly does not cure the original defect.
The examination approach is two-stage: first decide whether the termination is permitted, then apply its exact installation rules. Remembering the saddle orientation is necessary but incomplete. Correct count, tail, torque, rope compatibility and the governing application all remain part of the decision.
Sources: OSHA construction rigging, CCO compression-hardware topic, Crosby termination manual.
In a permitted conventional U-bolt clip application, which orientation is correct?
U-bolt on the live rope
Alternate clip direction along the eye
Either orientation if torque is doubled
Saddle on the live rope and U-bolt on the dead returned end
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