HTWR / Force data
Wire rope breaking force: reference data, calculation and WLL
Compare four clearly scoped reference rows and understand why a calculation or breaking-force value is not a working load rating.
Reference table
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| Construction | Nominal diameter (mm) | Published MBL (kN) |
|---|---|---|
| 7×7 | 3.00 | 5.48 |
| 7×7 | 4.00 | 9.75 |
| 7×19 | 3.00 | 5.12 |
| 7×19 | 4.00 | 9.09 |
These four values are from Deacon’s cited product tables, not HTWR test results, stock specifications or a certification claim. Obtain the documented value for the actual supplied rope. Sources and scope ↗
Download reference CSV ↓A reproducible calculation example
The existing estimator uses F (kN) = K × d² × R / 1000. For its 7×7 / 316 / WSC configuration, K = 0.388, d = 4 mm and R = 1570 N/mm² give 9.74656 kN, displayed as 9.747 kN. The cited table rounds its value to 9.75 kN. K is an approximate inferred coefficient for this configuration, not a universal constant.
Ask for the complete assembly basis
Record the rope specification, terminations, intended loading, inspection requirements and applicable design basis. Do not assume one generic divisor establishes a WLL for every application. The estimator does not model wear, corrosion, bending or dynamic loading.
Common questions
Why is the table slightly different from the calculator?
The calculator uses a rounded, inferred coefficient. A published product table and its rounding need not exactly match that approximation.
Can I use the same coefficient for stainless and galvanised rope?
Do not transfer a coefficient without matching its documented construction, material, core and strength-grade scope. Use the tool’s explicitly supported configuration.
Sources and scope
Reference information supports specification discussions. Confirm the actual supplied product and acceptance criteria with the manufacturing team.