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6×19 vs 6×36 vs 6×37 Wire Rope: Which One Should You Use?
Meta Description: What’s the difference of 6×19, 6×36WS, and 6×37 wire rope structures? Learn the differences in flexibility, abrasion resistance, and best applications for each type.
Among the hundreds of wire rope constructions available, three stand out as the most widely specified across global industries: 6×19, 6×36WS, and 6×37. Together, these three wire rope types account for the majority of wire rope used in construction, mining, marine, piling, and general lifting applications. But what’s the difference of wire ropes? Despite their popularity, many buyers and even experienced engineers struggle to differentiate between them — and choosing the wrong one can lead to premature wear, reduced safety, or unnecessary cost.
This article provides a clear, practical comparison of 6×19, 6×36WS, and 6×37 wire rope constructions. You’ll understand what each designation means, how they differ in performance, and which applications suit each type best. By the end, you’ll be able to make an informed choice — or know exactly what to ask your wire rope supplier.
Understanding Wire Rope Structure
What Do the Numbers Mean?
A wire rope designation such as “6×19” tells you two things:
- The first number (6): The number of strands laid helically around the core. In all three types compared here, this is 6 strands.
- The second number (19, 36, or 37): The approximate number of wires in each strand.
So a 6×19 rope has 6 strands, each containing approximately 19 wires, wrapped around a central core. A 6×36WS rope has 6 strands with roughly 36 wires per strand in a Warrington-Seale arrangement. A 6×37 rope has 6 strands with approximately 37 wires each.
Why Does This Matter?
The number of wires per strand fundamentally determines the rope’s performance balance:
- Fewer wires per strand (6×19): Each wire is thicker and more resistant to abrasion, but the rope is stiffer and less flexible.
- More wires per strand (6×36, 6×37): Each wire is thinner, giving the rope greater flexibility and better fatigue resistance, but at the cost of reduced abrasion resistance.
Understanding this trade-off is the key to choosing the right wire rope structure for your application.
6×19 Wire Rope: Features and Applications
Key Characteristics
- Wire count per strand: Approximately 19 wires (common variants: 6×19S Seale, 6×19W Warrington, 6×19M Merton)
- Flexibility: Low to moderate — stiffer than 6×36 and 6×37
- Abrasion resistance: High — the thicker outer wires withstand friction and surface wear
- Fatigue resistance: Moderate — fewer wires means fewer flex cycles before fatigue cracks develop
- Crush resistance: Good — the larger wires resist deformation under point loads
Typical Applications
6×19 wire rope is the go-to choice when abrasion resistance is the primary concern:
- Winch and traction lines: Where the rope runs over rough surfaces or through guides that cause surface wear.
- Guy lines and static tensioning: Where flexibility is less important than strength and durability.
- Saw lines and logging cables: Exposed to extreme abrasive contact with wood, rock, and debris.
- General-purpose hoisting: On equipment with large sheave-to-rope diameter ratios (D/d ≥ 20), where bending fatigue is less aggressive.
Available Configurations
6×19 ropes are available with both Fiber Core (FC) and Independent Wire Rope Core (IWRC), in grades from 1570 to 1960 MPa. Galvanized versions are available for corrosion-prone environments.
6×36WS Wire Rope: Features and Applications
Key Characteristics
- Wire count per strand: Approximately 36 wires in a Warrington-Seale (WS) arrangement
- The WS design: Combines the benefits of Warrington (large outer wires over small filler wires) and Seale (uniform outer wires with large inner wires) constructions. This provides an optimal balance of abrasion resistance and flexibility.
- Flexibility: Good — significantly more flexible than 6×19
- Abrasion resistance: Moderate to good — not as high as 6×19, but the WS design places larger wires on the outside for wear protection
- Fatigue resistance: High — the multi-wire strand design distributes bending stresses more evenly
- Crush resistance: Moderate — IWRC versions handle multi-layer spooling well
Typical Applications
6×36WS is often called the workhorse of the crane and piling industry:
- Crane hoist ropes: Excellent fatigue life under repeated bending over sheaves.
- Rotary drilling rigs: Handles multi-layer spooling, dynamic loads, and abrasive contact with drill cuttings. The 6×36WS IWRC construction is the most commonly specified rope for rotary drilling applications worldwide.
- Heavy-duty hoisting: Where a balance of strength, flexibility, and service life is needed.
- Offshore crane ropes: When galvanized, provides both fatigue resistance and corrosion protection.
Why WS Matters
The Warrington-Seale construction is not just about wire count — the specific arrangement of wire diameters within the strand creates a compact, well-supported rope that performs better under combined abrasion and fatigue than a simple 6×37 design. This is why 6×36WS is often preferred over 6×37 in demanding applications.
6×37 Wire Rope: Features and Applications
Key Characteristics
- Wire count per strand: Approximately 37 wires
- Flexibility: High — among the most flexible of the standard 6-strand constructions
- Abrasion resistance: Moderate — thinner outer wires wear faster under heavy abrasion
- Fatigue resistance: Excellent — the high wire count distributes bending stresses across many small wires, each experiencing lower individual stress
- Bending performance: Superior — ideal for applications requiring repeated bending over small sheaves or through tight sheave grooves
Typical Applications
6×37 wire rope excels in applications where flexibility and fatigue life are the primary requirements:
- Wire rope slings: Both hand-spliced and machine-pressed (swaged) slings use 6×37 for its excellent bendability around thimbles and eyes.
- Rigging and lifting: Where the rope must flex repeatedly around hooks, sheaves, and load contact points.
- Elevator ropes and passenger hoists: Where smooth, flexible operation is essential.
- General-purpose lifting: The default choice for many lifting applications where abrasion is not the dominant wear mechanism.
6×37 vs 6×36WS: A Common Confusion
These two constructions are very similar — some standards even consider them equivalent. In practice, 6×36WS and 6×37 are often used interchangeably. However, the WS design’s specific wire arrangement gives it a slight edge in combined abrasion-fatigue performance. If your application involves both heavy bending and abrasive contact (such as piling or crane operations), 6×36WS IWRC is the preferred choice. For pure flexibility applications like sling manufacturing, 6×37 FC is the industry standard.
Comparison Table
表格Parameter 6×19 6×36WS 6×37 Wires per strand ~19 ~36 (Warrington-Seale) ~37 Flexibility Low–Moderate Good High Abrasion resistance High Moderate–Good Moderate Fatigue resistance Moderate High Excellent Crush resistance Good Good (IWRC) Moderate Core options FC / IWRC FC / IWRC FC / IWRC Typical grades 1570–1960 MPa 1770–1960 MPa 1570–1770 MPa Best suited for Abrasion-dominated applications Combined fatigue + abrasion Flexibility-dominated applications Common applications Winches, traction, guy lines, logging Cranes, piling rigs, rotary drilling, heavy hoisting Slings, rigging, elevators, general lifting
How to Choose Between Them
Ask Yourself These Questions
1. Is abrasion the dominant wear mechanism?
If your rope runs over rough surfaces, through abrasive guides, or contacts rock, ore, or debris — choose 6×19. Its thick outer wires resist surface wear far better than the other two.
2. Does the rope bend repeatedly over sheaves or drums?
If your application involves continuous cycling — crane hoist ropes, piling winches, drilling rigs — choose 6×36WS IWRC. It delivers the best balance of fatigue life and abrasion resistance under dynamic conditions.
3. Is flexibility the top priority?
If you’re manufacturing slings, assembling rigging systems, or working with small sheave diameters — choose 6×37. Its superior flexibility makes eye formation easier and extends service life in bending-dominated applications.
4. What core type do you need?
For most heavy-duty industrial applications, IWRC is the right choice — it provides higher strength, better crush resistance for multi-layer spooling, and superior performance in high-temperature environments. FC is suitable for lighter-duty, general-purpose applications where weight savings and flexibility matter.
5. What does your equipment manufacturer specify?
Always check the OEM specifications first. Equipment manufacturers engineer their systems around specific rope constructions and diameters. Deviating from the specification without engineering approval can void warranties and compromise safety.
Get the Right Wire Rope for Your Application
Understanding the differences between 6×19, 6×36WS, and 6×37 wire rope types is the first step. The next step is sourcing from a manufacturer who can supply all three — in the right grades, core types, diameters, and coatings — with consistent quality backed by certifications.
Nanjing Goolinked Metal Technology Co., Ltd. manufactures a complete range of 6×19, 6×36WS, and 6×37 wire ropes, along with rigging slings and fittings, all under API and ISO quality systems. We export to over 50 countries and provide full technical documentation with every order.
Not sure which wire rope construction is right for your project? Send us your application details and equipment specifications — our technical team will provide a detailed recommendation and competitive quotation within 24 hours.
Nanjing Goolinked Metal Technology Co., Ltd.