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Junwei wire rope

Shanghai Junwei Wire Rope & Sling Co., Ltd. (JWGSS) is a Chinese manufacturer specializing in steel wire ropes, lifting slings, synthetic fiber ropes, and rigging hardware. The company is headquartered in Shanghai, China, and serves industries such as construction, marine, offshore, power generation, metallurgy, ports, heavy machinery, and infrastructure projects.

JWGSS provides integrated lifting and rigging solutions, offering both standard products and customized assemblies to meet specific industrial requirements. Their products are widely used in lifting, hoisting, load securing, and heavy-duty industrial applications worldwide. Read more...


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Main Product Categories

1. Steel Wire Ropes

High-strength steel wire ropes for lifting and load-bearing applications.

Typical Types

  • Galvanized steel wire ropes

  • Bright (plain) steel wire ropes

  • Plastic-coated steel wire ropes

Applications

  • Cranes

  • Construction machinery

  • Elevators

  • Port equipment

  • Heavy industrial lifting systems

2. Synthetic Fiber Ropes

Lightweight, corrosion-resistant ropes for marine and industrial use.

Typical Materials

  • Aramid fiber

  • Polyester

  • Nylon

  • UHMWPE (Ultra-High-Molecular-Weight Polyethylene)

Applications

  • Marine and offshore operations

  • Lightweight lifting systems

  • Load securing

  • Industrial rope replacement solutions

3. Lifting Slings & Rigging Products

Complete lifting sling assemblies for industrial load handling.

Typical Products

  • Wire rope slings

  • Chain slings

  • Pressed steel rigging assemblies

  • Hand-spliced rope assemblies

  • Cast rigging fittings

4. Lifting Accessories & Hardware

Essential hardware for connecting and securing lifting systems.

Typical Products

  • Shackles

  • Eye nuts and lifting rings

  • Rope clips

  • Cable clamps

  • Swivel links

  • Connectors and fittings

Industry Applications

JWGSS products are used in:

  • Construction and heavy lifting

  • Marine and offshore platforms

  • Port and container handling systems

  • Power plants and renewable energy projects

  • Steel mills and metallurgical facilities

  • Bridge construction and infrastructure

  • Oil and petrochemical industries

Company Strengths

  • Broad product portfolio covering wire ropes, fiber ropes, slings, and accessories

  • Custom lifting solutions available

  • Export-oriented manufacturing experience

  • Focus on safety, durability, and cost-effectiveness

  • Technical support for pre-sale and after-sale services

Steel Wire Rope Construction & Structure List

Steel wire ropes are classified by number of strands × number of wires per strand, as well as by core type and lay type.

1. 6-Strand Constructions (Most Common Industrial Types)

6×7 Class (6×7 + FC / IWRC)

  • Construction: 6 strands with 7 wires per strand

  • High abrasion resistance

  • Lower flexibility

  • Suitable for static applications

Typical Variants

  • 6×7 + FC

  • 6×7 + IWRC

6×19 Class (General Purpose Rope)

Widely used in lifting and general applications.

Common Variations

  • 6×19 + FC

  • 6×19 + IWRC

  • 6×19 Seale (S)

  • 6×19 Warrington (W)

  • 6×19 Filler Wire (FW)

Applications

  • Cranes

  • Hoists

  • General lifting

6×24 / 6×25 Class

Balanced flexibility and wear resistance.

Typical Constructions

  • 6×24 + FC

  • 6×24 + IWRC

  • 6×25 Filler Wire

6×36 Class (High Flexibility Rope)

Higher wire count per strand → more flexible.

Typical Constructions

  • 6×36 + FC

  • 6×36 + IWRC

  • 6×36 Warrington-Seale

  • 6×36 Compact

Applications

  • Tower cranes

  • Mobile cranes

  • Heavy lifting

6×37 Class

Very flexible rope for dynamic applications.

  • 6×37 + FC

  • 6×37 + IWRC

2. 8-Strand Constructions

Used for improved flexibility and rotation resistance.

  • 8×19 + FC

  • 8×19 + IWRC

  • 8×25

  • 8×36

Applications

  • Offshore

  • Marine

  • Winches

3. Rotation-Resistant & Non-Rotating Ropes

Designed to minimize rope rotation under load.

Common Structures

  • 19×7

  • 18×7

  • 35×7

  • 19×19

Applications

  • Tower cranes

  • Lifting heavy suspended loads

  • High-rise construction

4. Compacted & Swaged Ropes

Higher breaking load and smoother surface.

  • 6×36 Compact

  • 8×K36 Compact

  • 35×7 Compact

Core Types

FC – Fiber Core

  • More flexible

  • Lower breaking strength

  • Better lubrication retention

IWRC – Independent Wire Rope Core

  • Higher strength

  • Better crush resistance

  • Preferred for heavy lifting

WSC – Wire Strand Core

  • Intermediate strength and flexibility

Lay Types

Regular Lay

  • Wires and strands laid in opposite directions

  • More stable, less rotation

Lang Lay

  • Wires and strands laid in same direction

  • More abrasion resistant

  • Better fatigue resistance

Alternate Lay

  • Combination of regular and Lang lay

Typical Surface Finishes

  • Bright (ungavanized)

  • Galvanized

  • Plastic-coated

  • Compacted

  • Lubricated

Example Product Specification Format (For Quotation)

Example 1:

6×36 IWRC, Right Regular Lay, Galvanized, 18mm Diameter

Example 2:

19×7 Rotation Resistant, IWRC, Lang Lay, 16mm Diameter

Comparison: Standard Steel Wire Rope vs. Rotation-Resistant Wire Rope

Steel wire ropes are generally classified into standard (conventional) constructions and rotation-resistant constructions based on their structural behavior under load.

1. Structural Difference

Standard Steel Wire Rope

  • Typical constructions: 6×19, 6×36, 6×37

  • Consists of 6 or 8 outer strands laid around a core (FC, WSC, or IWRC)

  • Designed primarily for strength and flexibility

  • Not specifically designed to prevent rotation under load

Rotation-Resistant Wire Rope

  • Typical constructions: 19×7, 18×7, 35×7

  • Multi-layer strand design (inner strands laid opposite to outer strands)

  • Engineered to reduce or eliminate rope rotation under load

  • Also referred to as non-rotating rope (though true zero rotation does not exist)

2. Behavior Under Load

FeatureStandard RopeRotation-Resistant Rope
Rotation under loadWill rotate when freely suspendedSignificantly reduced rotation
Load stabilityLoad may spinLoad remains stable
Suitability for single-line liftingLimitedExcellent
Multi-layer drum windingGoodMore sensitive

3. Typical Applications

Standard Steel Wire Rope

  • General cranes

  • Winches

  • Hoists

  • Static load applications

  • Multi-fall reeving systems

Best used when:

  • Load rotation is not critical

  • Rope is part of multi-part lifting system

Rotation-Resistant Wire Rope

  • Tower cranes

  • Mobile cranes (single-line operation)

  • High-rise construction

  • Lifting of long or sensitive loads

  • Situations where load spinning is dangerous

Best used when:

  • Load is freely suspended

  • Single-fall lifting is required

  • Rotation control is critical for safety

4. Advantages & Disadvantages

Standard Rope

Advantages

  • Lower cost

  • Stronger outer strands

  • Better abrasion resistance

  • Easier inspection

  • Longer service life in multi-layer drum applications

Disadvantages

  • Load rotation occurs under tension

  • Not suitable for single-line vertical lifting of heavy loads

Rotation-Resistant Rope

Advantages

  • Minimizes load spinning

  • Ideal for single-fall lifting

  • Safer for high-lift applications

Disadvantages

  • More complex structure

  • Higher cost

  • More sensitive to improper handling

  • Can be damaged more easily if shock-loaded

5. Core Comparison

FactorStandard RopeRotation-Resistant Rope
Structure6 or 8 strandMulti-layer strand
Rotation controlNoYes
CostLowerHigher
Abrasion resistanceHigher (generally)Moderate
Ideal for tower cranesNoYes
Ideal for general liftingYesSometimes over-specified

6. Selection Guideline

Choose Standard Steel Wire Rope when:

  • Cost efficiency is important

  • Multi-part reeving is used

  • Rotation is not a safety concern

Choose Rotation-Resistant Rope when:

  • Single-fall lifting

  • Tall structure lifting (tower crane)

  • Load stability is critical

  • Operator safety requires minimal load spinning

 

Recommended Steel Wire Rope Constructions for Crane Applications

Selecting the correct wire rope construction for crane applications is critical for safety, durability, and performance. The selection depends on lifting method, reeving system, drum type, and whether load rotation control is required.

1. Quick Selection Table by Crane Type

Crane TypeTypical ReevingRecommended Rope ConstructionCore TypeNotes
Tower Crane (Single Fall)Single-line19×7, 35×7 (Rotation Resistant)IWRCPrevents load spinning
Mobile Crane (Single Fall)Single-line19×7, 35×7IWRCEssential for tall lifts
Mobile Crane (Multi-fall)Multi-part6×36, 6×37IWRCRotation less critical
Crawler CraneMulti-part6×36, 6×37IWRCHigh flexibility required
Overhead CraneMulti-part6×36, 6×19IWRC or FCCost-effective option
Gantry CraneMulti-part6×36IWRCGood fatigue resistance
Port Crane / Container CraneMulti-part8×36, 6×36 CompactIWRCHeavy-duty use
Winch ApplicationsSingle-layer drum6×19, 6×36IWRCAbrasion resistant
High-Rise ConstructionSingle-line35×7IWRCRotation control critical

2. Selection Based on Lifting Method

A. Single-Fall Lifting (Free-Hanging Load)

Recommended:

  • 19×7

  • 18×7

  • 35×7

Why?

  • Minimizes rope rotation

  • Prevents load spinning

  • Required for tall lifting heights

Core: IWRC only

B. Multi-Part Reeving (Multi-Fall System)

Recommended:

  • 6×36

  • 6×37

  • 6×19

Why?

  • Rotation naturally balanced by reeving system

  • Better abrasion resistance

  • Longer service life

Core:

  • Heavy duty → IWRC

  • Light duty → FC possible

3. Selection Based on Drum Type

Single-Layer Drum

  • 6×19

  • 6×36

  • 8×36

Multi-Layer Drum

  • 6×36 Compact

  • 8×K36

  • 35×7 (only if rotation control required)

Note:
Rotation-resistant ropes are more sensitive in multi-layer drum conditions.

4. Recommended Constructions by Duty Level

Duty LevelRecommended Structure
Light duty6×19 + FC
Medium duty6×36 + IWRC
Heavy duty6×36 Compact + IWRC
Extreme height35×7 + IWRC

5. Practical Engineering Guidelines

Use 6×36 IWRC when:

  • General-purpose crane lifting

  • Good balance between flexibility and strength

  • Most common universal crane rope

Use 6×19 IWRC when:

  • Abrasion resistance is more important

  • Lower bending cycles

Use 35×7 IWRC when:

  • Single-line tower crane

  • Load spinning must be minimized

  • High-rise construction

6. Sample Specification Format for Crane Quotation

Example 1:

6×36 IWRC, Right Regular Lay, Compacted, 18 mm Diameter, Galvanized

Example 2:

35×7 Rotation Resistant, IWRC, 16 mm Diameter, Non-Compacted

7. Important Safety Note

Rotation-resistant ropes:

  • Must not be shock loaded

  • Must be handled carefully during installation

  • Require correct spooling procedures

Improper use can cause internal structural damage.