Wire Rope Stretch Calculator
Constructional plus elastic stretch of new wire rope under load.
Rope 'E' is only ~100 GPa (not steel's 200) because strands straighten helically. Constructional stretch is permanent and front-loaded — why new elevator and crane ropes get re-tensioned.
Formula
Wire Rope Stretch Calculator is a free wire rope stretch for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Wire Rope Stretch Calculator
Constructional plus elastic stretch of new wire rope under load. The calculation implements elastic: δ = FL/(A_metallic·E_rope); + constructional % (Wire Rope Users Handbook). Rope 'E' is only ~100 GPa (not steel's 200) because strands straighten helically. Constructional stretch is permanent and front-loaded — why new elevator and crane ropes get re-tensioned.
How to use Wire Rope Stretch Calculator
- 1Enter Rope length in m.
- 2Enter Applied load in kg.
- 3Enter Rope diameter in mm.
- 4Enter Constructional stretch in % (6-strand new: 0.5–0.75% · settles after bedding-in).
- 5Read Elastic stretch, Total stretch (new rope) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Wire Rope Stretch Calculator?
- ✓Implements the standard formula — elastic: δ = FL/(A_metallic·E_rope); + constructional %
- ✓Reference cited on-page: Wire Rope Users Handbook
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Wire Rope Stretch Calculator use?+
It computes elastic: δ = FL/(A_metallic·E_rope); + constructional %, per Wire Rope Users Handbook. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Rope 'E' is only ~100 GPa (not steel's 200) because strands straighten helically. Constructional stretch is permanent and front-loaded — why new elevator and crane ropes get re-tensioned.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Wire Rope Stretch Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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