6×K31 Compacted Wire Rope | Plastic-Injected Core

6×K31 Compacted Wire Rope | Plastic-Injected Core

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6×K31 Compacted Wire Rope | Plastic-Injected Core
  • 6×K31 Compacted Wire Rope | Plastic-Injected Core
  • 6×K31 Compacted Wire Rope | Plastic-Injected Core
  • 6×K31 Compacted Wire Rope | Plastic-Injected Core
  • 6×K31 Compacted Wire Rope | Plastic-Injected Core
  • 6×K31 Compacted Wire Rope | Plastic-Injected Core
6×K31 Compacted Wire Rope | Plastic-Injected Core

6×K31 Compacted Wire Rope | Plastic-Injected Core

6×K31 Compacted Wire Rope – Plastic-Injected Core is a 6-strand wire rope construction, available in 6×K19S, 6×K26WS, 6×K31WS, 6×K36WS variants.

Wide range of cranes: overhead travelling cranes, port cranes, metallurgical cranes, mobile cranes, cable cranes, launching gantries, offshore platform cranes, marine cranes.

6×K31 Compacted Wire Rope | Plastic-Injected Core
Specifications

Diameter: 14–80 mm. Constructions: 6×K19S, 6×K26WS, 6×K31WS, 6×K36WS. Core: plastic-injected steel core (EPIWRC). Wire grade: 1770, 1960 or 2160 N/mm². Finish: bright or galvanized. Lay: right or left hand, regular or Lang's. Manufactured to EN 12385, ASTM A1023, YB/T 5359 and GB/T 8918. HS code 7312.10.
Packing & Delivery

Supplied on wooden or steel reels to 3,000 m, or cut to your required lengths. MOQ 1,000 m, negotiable. Packed for sea freight and shipped CIF. Lead time confirmed at quotation. Payment 30% deposit with balance before shipment.
Certification & Documentation

Manufactured under ISO 9001:2015, with ISO 14001, 45001 and 50001 management systems certified by CICC. CCS Works Approval held for marine rope, 10–80 mm. Every shipment ships with a mill certificate and test report. Additional documentation available on request.

Technical Specification

6×K31 plastic-injected core weight and minimum breaking force by diameter
Diameter mm Weight — steel core kg/m Weight — plastic-injected kg/m MBF 1770 kN MBF 1960 kN MBF 2160 kN
140.9060.913161177192
161.1831.192206228239
181.4971.509260289313
191.6681.681287317339
201.8481.863316350373
222.2362.254377418444
242.6612.682462511544
263.1233.148546605641
283.6223.651622688735
304.1854.192680750830
324.7314.769800886960
345.3405.3848759701060
365.9886.036100011101180
407.3927.451122013501390
448.9449.015142015751670
4810.64410.729178019701980
5212.49212.592202022402330
5614.48814.603234025902700
6016.63216.764269029803100
6418.92319.073306033903530
6821.36221.532345038203980
7223.95024.140387042804460
7626.68526.896432047804980
8029.56729.802478052905510

Scroll the table sideways to see all columns.

MBF = minimum breaking force at the stated wire tensile grade (N/mm²). Weights are nominal. The plastic-injected core adds roughly 0.5–1% to rope weight and does not change breaking force — its benefit is service life, not strength. Diameters outside 14–80 mm and non-standard grades are manufactured to order — request a quote.

About this construction

What does the plastic-injected core do?

A polymer layer is injected between the outer strands and the steel core. It cushions the strands against each other, spreads internal pressure instead of concentrating it at contact points, and holds lubricant in the core where it's needed.
Does it make the rope stronger?

No. Breaking force is identical to the standard steel-core version at every diameter and grade. What changes is how long the rope survives in service, particularly under multi-layer spooling and high cycle counts.
When is it worth the extra cost?

When ropes are failing from the inside out — internal wear, broken wires found in the valleys rather than the crowns, or lubricant washing out. On multi-layer drums and continuous-duty cranes it typically pays back several times over in extended service life.
Can I inspect it the same way?

Largely yes, but internal deterioration is harder to see because the polymer holds the structure together. Follow your usual discard criteria and pay closer attention to diameter reduction over the rope's life — our engineers can advise on inspection intervals.

Applications

Protection where the rope wears itself out

Most rope failures start internally, where strands rub against the core under load. The injected polymer separates those surfaces and keeps grease in the rope, so the same construction lasts noticeably longer on multi-layer drums and high-cycle crane duty.
See construction guide
A worker in a gray uniform and orange hard hat operates a large yellow and blue industrial machine inside a factory or workshop with concrete walls and metal equipment.

Manufacturing

Drawn, stranded and closed in-house

Every rope starts as Baosteel or Shagang wire rod and runs through our own servo-driven drawing and planetary stranding machines. German Fosser lubricant is applied at closing, and each rope is tensile tested against its declared breaking force before it ships.
Factory & quality

Ordering

Cut, reeled and shipped to spec

Reels run to 3,000 m, with custom lengths cut to order. Every shipment carries a mill certificate and test report, packed for sea freight and shipped CIF from the Yangtze Delta.

MOQ 1,000 m, negotiable.
Export & logistics

Application & Selection Guides

Wire rope for container and port cranes: selection guide

Wire rope for container and port cranes: selection guide

Container terminals run more lifting cycles in a week than most cranes see in a year, and the rope is doing three difficult things at once. This guide covers what...

Tell us your specification and we'll quote it.

Request a Quote