Buyer reference tool
Wire Rope Construction and MBL Reference
This reference helps buyers collect the fields needed for a rope discussion. It deliberately stops before safe-load selection because catalog MBL, design factor, termination, reeving, dynamics, equipment geometry, and jurisdiction must be evaluated together. Use the output as an RFQ brief for the equipment manufacturer, rope specialist, and qualified person.
SSR reference
Start with the published comparison
| Construction family | Common design concern | Checks before RFQ |
|---|---|---|
| 6x19 class | Balance of abrasion resistance and flexibility for selected running-rope duties | Exact construction, core, wire size, D to d, grooves, speed, and duty |
| 6x36 class | Greater flexibility for repeated bending in suitable equipment | Abrasion, crushing, sheaves, drum layers, lubrication, and inspection |
| Compacted rope | Higher metallic area or improved contact behavior in approved systems | Drum and sheave compatibility, crushing, rotation, diameter, and manufacturer approval |
| Rotation-resistant rope | Reduced load rotation in equipment designed for the construction | Lift height, block stability, reeving, swivel rules, installation, and discard criteria |
Selection logic
- 1.Identify the equipment, rope function, reeving, drum, sheaves, grooves, fleet angle, speed, travel, and duty before comparing constructions.
- 2.Use exact construction, diameter, core, grade, lay, finish, lubrication, and certificate MBL from the proposed rope specification.
- 3.Have the responsible engineer apply the governing design factor, dynamics, reeving, termination efficiency, and equipment requirements outside this reference.
- 4.Transfer the complete system data, inspection rules, termination, reel, installation, and documentation needs into the RFQ.
Limits
- The reference does not produce safe working load, allowable line pull, service life, discard decision, or lifting-system certification.
- Generic construction classes can contain different wire patterns, cores, grades, compaction, and performance. The exact manufacturer designation and certificate control.
- MBL values should not be inferred from a visually similar rope or transferred across diameter, grade, core, finish, or construction.
Error recovery
- If the equipment or reeving data is absent, stop at data collection and request the machine manual or manufacturer specification.
- If MBL is entered without a source designation and certificate basis, mark it unverified and do not calculate a working load.
- If termination, swivel use, lay direction, or drum winding is unknown, request installation details before proposing a rope construction.
Continue with application and product owners
Lifting and hoisting selection
Connect construction and MBL evidence to equipment, duty, sheaves, environment, and inspection.
Open ownerCompacted wire rope
Review a registered compacted rope owner and its current indexing limits.
Open ownerSteel strand
Review strand products separately from running rope applications.
Open ownerRFQ requirements
Use the selector with these remaining commercial and technical fields.
- 01
Equipment, function, reeving, drum, sheaves, grooves, fleet angle, speed, travel, and duty
- 02
Loads, dynamics, design factor source, governing standard, and equipment approval route
- 03
Construction, diameter, core, grade, lay, finish, lubricant, length, and certificate MBL
- 04
Termination, swivel, installation, inspection, discard rules, and document package
- 05
Reel, pay-off direction, handling, storage, destination, and required date
Frequently asked questions
Does this reference calculate safe working load?
No. It records construction and MBL evidence for an RFQ. A qualified person must apply the governing rules, equipment data, reeving, dynamics, termination efficiency, and exact certified rope.
Can two ropes in the same construction class share one MBL?
No assumption should be made. Diameter, wire grade, core, compaction, finish, construction detail, and manufacturer design can change the certified MBL.
Why are sheave and drum dimensions required?
Bending radius, groove fit, fleet angle, reverse bends, and layer winding affect fatigue, abrasion, crushing, spooling, and the suitability of a rope construction.