A thimble supports the eye of a wire-rope termination, while clips secure the returned end to the loaded leg. The assembly depends on the exact rope, fittings and installation procedure. This page illustrates those parts; it does not calculate a working load or assign a universal termination-strength percentage.
Guy Rope Clip and Thimble Interactive Calculator
Explore a schematic rope eye and simple diameter multiples. The illustrated dimensions and clip count are not installation specifications. Strength is not rated: use the rope and fitting manufacturer’s instructions for the exact application.
Equation Used
The radius and spacing outputs are only 4d and 6d arithmetic examples. They are not verified minimum dimensions. The clip count controls the sketch and is not a complete selection table. Neither saddle orientation nor clip count is sufficient to calculate termination strength.
- Select compatible rope, thimble and clips using their manufacturer’s data.
- The displayed 4d radius is an illustration assumption, not a minimum bend-radius specification.
- The displayed 6d spacing is an illustration assumption, not an installation rule.
- No strength percentage is assigned to either orientation. An incorrectly assembled termination is not given a reduced working-load rating.
What the thimble and clips do
The loaded length of wire rope is the live leg. The returned tail is the dead end. A thimble supports the eye where it bears against connecting hardware, while the clips clamp the two rope legs together. The thimble and clips serve different purposes; neither alone establishes the capacity of the finished assembly.
For Crosby G-450 U-bolt clips, the manufacturer places the saddle on the live leg and the U-bolt over the dead end. The same instruction must not be generalized to other fitting designs without checking their documentation. Use the complete instructions for the exact clip and rope, including applicability, turnback, quantity, positioning, torque and inspection.
The upper drawing shows the rope turning around a thimble and returning through the selected number of clips. The enlarged end view distinguishes the live leg, tail, saddle, U-bolt and nuts. The orientation switch turns the clips over and identifies the reversed arrangement as incorrect. A pulsing arrow identifies load direction; the rope and fittings remain stationary. Contact pressure, deformation, slip and fatigue are not calculated.
Using an eye termination
Clip-and-thimble eyes appear in wire-rope connections where the selected fittings and installation method are permitted by the application. A description as a guy, stay or tieback does not itself establish suitability.
Rope construction, coating, size, loading and fitting design matter. Do not assume that data for a flexible wire rope applies to a different strand construction, synthetic rope or plastic-coated rope. For lifting or structural work, use the applicable product instructions and project requirements; this page does not approve a termination for those uses.
Dimensions versus strength
Illustrated spacing = 6d
Strength rating: not calculated
d is the selected rope diameter in inches. The upper view uses the selected rope diameter, 4d circular eye radius and 6d clip-centre spacing on one scale. Other fitting dimensions and the enlarged end view are illustrative. These diameter multiples are not manufacturer-specified minimums.
The clip display uses two clips at 1/4 and 3/8 inch, three at 1/2 inch, and three or four at 5/8 inch according to the extra-clip switch. This explains the visual control only. It does not determine installation requirements or provide a fatigue benefit.
A product-specific efficiency example
Crosby’s G-450 instructions state an 80% efficiency for properly prepared loop or thimble-eye terminations in sizes 1/8 through 7/8 inch. That efficiency refers to wire-rope minimum breaking force and the rope constructions and preparation conditions specified in that document. It is not a universal value, a working-load rating or proof that an assembled eye meets the instructions. Crosby directs users of other rope constructions to its engineering support.
Adding a clip does not give a fixed percentage increase in strength. Reversing a clip does not produce a dependable 40% rating. Neither claim is supported by the three inputs on this page.
Example: read the sketch controls
At d = 1/2 inch, the arithmetic outputs are 4 × 0.5 = 2 inches and 6 × 0.5 = 3 inches, and the sketch shows three clips. The Strength Rating output reads Not rated. These dimensions are examples, not instructions for assembling a 1/2-inch termination.
At d = 5/8 inch, the same multipliers give 2.5 inches and 3.75 inches. The extra-clip control changes the illustration from three to four clips. It does not calculate a shock-load capacity, establish a minimum quantity or demonstrate an improvement in fatigue life.
Information needed for an actual assembly
| Question | Required information |
|---|---|
| Are the parts compatible? | Exact rope construction and size, and the fitting manufacturer’s applicability data. |
| How is the eye prepared? | The complete product-specific installation instructions. |
| What load is permitted? | Validated termination data and the design requirements for the application; breaking force is not working load. |
| How is it maintained? | Product and application inspection requirements and actual condition. |
Swaged, socketed, spliced and clipped terminations use different systems and procedures. Universal strength percentages or service-life rankings do not provide a sound comparison.
Frequently asked questions
Does the sketch give an assembly strength rating?
No. Strength Rating is Not rated for every input. The geometry controls do not establish termination efficiency or working load.
Is a correctly oriented clip rated to 100% of rope strength?
No such universal rating follows from orientation. Product-specific efficiency applies only under the manufacturer’s stated conditions.
Can I use a reversed clip at a reduced 40% rating?
No. The calculator does not assign a reduced rating to an incorrect assembly. Follow the fitting manufacturer’s requirements and have the assembly assessed appropriately.
Are 4d radius and 6d spacing minimum requirements?
No. They are illustrative diameter multiples in this tool. Obtain the actual dimensions and installation requirements from the appropriate product instructions.
Does the extra-clip switch model shock loading?
No. At 5/8 inch it adds one clip to the drawing. No force, fatigue or shock calculation is performed.
Does 80% termination efficiency mean 80% is the working load?
No. Termination efficiency is referenced to rope minimum breaking force. Working load also depends on the application and its required design factors and conditions.
Does this page validate a tower guy or lifting sling?
No. The rope, hardware, loads, installation and applicable requirements must be assessed for the actual project.
References and further reading
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