Why construction matters
In the current CWRS materials, a steel wire rope is built from wires into strands, then into a rope around a core. Construction codes such as 6×19, 6×37, 8×19S or 35W×7 describe how those strands are arranged. They are formal product identifiers on the data sheets — not marketing nicknames.
Because different constructions appear against different listed applications, selection starts with the duty context, then moves into the construction family that the source already associates with that duty.
Do not invent single-wire material grades or filament diameters in selection copy. The foundation construction source does not provide those values for general publication.
A practical selection path
The Construction Selection Guide organizes selection as a sequence, not a single dropdown:
- ApplicationHoisting, port, elevator, towing, mining and other listed duties
- Construction familyRound strand, line-contact, non-rotating, compacted, elevator and related groups
- Core typeFC / NF / SF / IWS / IWR / IWRC as shown on the product page
- SurfaceUngalvanized or galvanized where listed
- DiameterNominal diameter from equipment or existing rope
- Tensile strengthMPa grades shown in the product table
- Minimum Breaking LoadWhere the data sheet provides MBL — not interchangeable with WLL
- Technical confirmationReview tables and send inquiry details / drawing
Candidate families are for further technical confirmation. The source does not authorize “this is definitely the best rope” language.
Construction families in the CWRS range
The live Wire Rope series hub groups constructions into Standard, Special / Non-Rotating and Compacted families. Representative codes from the construction basics and product pages include:
- Round strand: 6×7 / 6×9W, 6×19, 6×37, 6×12, 6×24
- Line-contact: Fi / WS / S / SWS patterns in 6-strand and 8-strand families
- Elevator: 8×19S, 8×19W
- Non-rotating: 4-strand flat, multi-layer and 35W×7 families
- Compacted: 6×K / 8×K series, parallel-lay and multi-strand compacted pages
Open the matching product detail page for diameter ranges, tensile grades and Minimum Breaking Load rows.
Standard examples used for inquiry entry
6×19 is listed for hoisting, lifting and drawing. 6×37 extends that general-purpose group with larger diameter coverage for hoisting, derricking, lifting and drawing. Line-contacted constructions add Fi / WS / S / SWS options, with steel-core notes for shock-load, heated and squeezed conditions such as electric shovel service where the source states them.
Application → construction mapping
The following mapping uses only applications already listed in the Construction Selection Guide and related product sources:
| Application (source) | Candidate construction families |
|---|---|
| Cable carriage / ropeway / slope winch | 6×7 / 6×9 |
| Hoisting / lifting / drawing | 6×19 · 6×37 · line-contact · triangular strand |
| Elevator / derricking machinery | 8×19S · 8×19W |
| Port loading · derrick · tower crane | Non-rotating families (4-strand flat · multi-layer · 35W×7) |
| Towboat · goods net · timber transport · bundling | 6×12 · 6×24 |
| Mining / hoisting / oil & drilling (series context) | Compacted families for further confirmation |
First question in the selector logic: What is the application? If the buyer is unsure of construction, still collect equipment type, existing rope photo, diameter and quantity.
Core, surface and lay direction
Core type
Product tables show fiber-core and steel-core options using codes such as FC, NF, SF, IWS, IWR and IWRC. Core choice changes how a construction is listed on the data sheet and must be confirmed against the required duty — not assumed from the construction code alone.
Surface
The application recommendation states that galvanized wire rope should be used where corrosion is the main reason for rope retirement. The materials do not support a universal rule that every marine rope must be galvanized; surface still needs confirmation for the operating environment.
Lay direction
Current materials show four lay codes: ZS, SZ, ZZ and SS. Application notes recommend same-direction lay where the rope end cannot rotate freely, or where counter-torque exists but the ropes cannot twist together during operation.
Diameter, tensile strength and Minimum Breaking Load
Diameter is a nominal field on each product page. Tensile-strength grades appear as MPa columns in the source tables. Minimum Breaking Load is listed where the sheet provides it.
Minimum Breaking Load ≠ Working Load Limit. Wire-rope sheets in the current source use MBL. WLL belongs to sling / lifting contexts elsewhere on the site. Do not convert one into the other in the article or the inquiry form.
What to send for technical confirmation
Useful inquiry fields from the FAQ and selection guide include:
- Application and equipment type
- Existing rope construction (if known)
- Diameter
- Core type and surface preference
- Tensile strength and required Minimum Breaking Load if known
- Lay direction
- Required length and quantity
- Existing rope photo, marking or datasheet / drawing
When construction is unknown, select Not Sure on the Contact form and describe the duty. CWRS can map the request to candidate families for confirmation.