| Web Width |
No. Plys of Web |
Part No. |
Rated Capacities in Lbs. | Eye Length |
||
|---|---|---|---|---|---|---|
| Vertical | Choker | V Basket | ||||
1" |
1 |
EE1-91 | 1,600 | 1,280 | 3,200 | 9" |
2 |
EE2-91 | 3,100 | 2,480 | 6,200 | 9" | |
3 |
EE3-91 | 4,100 | 3,300 | 8,200 | 12" | |
4 |
EE4-91 | 6,200 | 4,960 | 12,400 | 12" | |
2" |
1 |
EE1-92 | 3,100 | 2,480 | 6,200 | 9" |
2 |
EE2-92 | 6,200 | 4,960 | 12,400 | 9" | |
3 |
EE3-92 | 8,300 | 6,600 | 16,600 | 12" | |
4 |
EE4-92 | 12,400 | 9,920 | 24,800 | 12" | |
3" |
1 |
EE1-93 | 4,650 | 3,720 | 9,300 | 9" |
2 |
EE2-93 | 9,300 | 7,440 | 18,600 | 12" | |
3 |
EE3-93 | 12,500 | 10,000 | 25,000 | 18" | |
4 |
EE4-93 | 18,600 | 14,880 | 37,200 | 18" | |
4" |
1 |
EE1-94 | 6,200 | 4,960 | 12,400 | 12" |
2 |
EE2-94 | 11,000 | 8,800 | 22,000 | 12" | |
3 |
EE3-94 | 16,000 | 12,800 | 32,000 | 18" | |
4 |
EE4-94 | 22,000 | 17,600 | 44,000 | 18" | |
6" |
1 |
EE1-96 | 9,300 | 7,440 | 18,600 | 14" |
2 |
EE2-96 | 16,500 | 13,200 | 33,000 | 14" | |
3 |
EE3-96 | 23,000 | 18,400 | 46,000 | 20" | |
4 |
EE4-96 | 33,000 | 26,400 | 66,000 | 20" | |
8" |
1 |
EE1-98 | 12,400 | 9,920 | 24,800 | 18" |
2 |
EE2-98 | 22,000 | 17,600 | 44,000 | 18" | |
3 |
EE3-98 | 30,700 | 24,560 | 61,400 | 24" | |
4 |
EE4-98 | 44,000 | 35,200 | 88,000 | 24" | |
10" |
1 |
EE1-910 | 15,500 | 12,400 | 31,000 | 22" |
2 |
EE2-910 | 27,500 | 22,000 | 55,000 | 22" | |
3 |
EE3-910 | 36,800 | 29,400 | 73,600 | 28" | |
4 |
EE4-910 | 55,000 | 44,000 | 110,000 | 28" | |
12" |
1 |
EE1-912 | 18,600 | 14,880 | 37,200 | 26" |
2 |
EE2-912 | 33,000 | 26,400 | 66,000 | 26" | |
3 |
EE3-912 | 44,000 | 35,200 | 88,000 | 32" | |
4 |
EE4-912 | 66,000 | 52,800 | 132,000 | 32" | |
Capacities shown are for Holloway Houston manufactured slings only. Do not exceed the values printed on the sling tag.
Overview of Synthetic Flat Web Slings
Holloway Houston manufactures synthetic flat web slings for lifting applications requiring flexible rigging, load protection, and controlled handling. Available in multiple widths, plies, and hitch configurations (vertical, choker, basket), these slings are designed to distribute load evenly, minimizing point loading and reducing damage to delicate or finished surfaces.
Working Load Limits (WLL) and hitch capacities are established by Holloway Houston and displayed on each sling’s permanent identification tag. Sling performance is affected by sling angle, hitch geometry, D/d around hardware, and environmental conditions, emphasizing the importance of qualified selection and inspection.
Design of Flat Web Slings
Flat web slings are constructed from high-strength synthetic fibers and feature reinforced stitching to form eye loops or end fittings. They are available in flat, tubular, or endless designs and in various widths and lengths to meet different lifting requirements. The woven construction provides strength, flexibility, and minimal stretch, while the flat surface protects delicate loads. Each sling carries a permanent ID tag detailing material, configuration, and rated WLL for vertical, choker, and basket hitches.
Materials Used in Flat Web Slings
Synthetic flat web slings are primarily manufactured using nylon or polyester fibers. Each material offers different performance characteristics that affect elongation, flexibility, and environmental compatibility.
Nylon Web Slings
Nylon slings typically exhibit approximately 8–10% elongation at the rated load, which can help absorb shock but may introduce additional movement during lifting. Nylon generally resists alkalis but is not recommended for use with acids or bleach.
It absorbs moisture, which can increase elongation during a lift. Typical manufacturer-specified service temperature limits fall within the 180–200°F range. The sling's identification tag governs actual limits for each unit.
Polyester Web Slings
Polyester slings typically exhibit lower stretch at around 3% at rated load, providing better load control and stability during lifting operations. Polyester generally resists acids and bleach but is not recommended for strong alkalis at elevated temperatures. It absorbs very little moisture and remains non-conductive when dry. Like nylon, the typical service temperature range is around 194–200°F, but the tag governs actual limits.
Material Awareness
Both nylon and polyester slings can be weakened by sharp edges, excessive abrasion, high heat, ultraviolet (UV) exposure, and incompatible chemicals. Proper edge protection and environmental evaluation are required in all lifting applications.
Types of Web Slings (Per ASME B30.9)
Synthetic flat web slings are produced in multiple configurations to suit different rigging scenarios. Each type is designed to support specific connection styles and load shapes. Each sling must carry a permanent identification tag. If the tag is missing or unreadable, the sling must be removed from service.
Triangle & Choker (TC)
Features a metal triangle on one end and a choker fitting on the other. This configuration is commonly used in choker or adjustable applications where a tight wrap around the load is required.
Triangle & Triangle (TT)
Includes metal triangles on both ends. This type is generally used in vertical and basket hitches where direct connection to hooks or hardware is needed on both ends.
Flat Eye & Eye (EE)
Designed with flat reinforced eyes at both ends. Flat eyes sit lower under the load, making them easier to remove after a lift. They are commonly used in basket and vertical applications
Twisted Eye & Eye (EE – Twisted)
Equipped with twisted eyes that align more naturally in the bowl of a hook. These perform better in choker applications and reduce twisting in certain connection points.
Endless Web Slings
Formed as a continuous loop with no fixed ends. This allows the sling to be rotated periodically, distributing wear evenly along its entire length.
Reverse Eye Web Slings
Designed with special eye construction for specific rigging requirements where traditional eye orientation may not fit the application.
Understanding Working Load Limits (WLL) Capacity Awareness
The Working Load Limit (WLL) is the maximum load a sling is rated to carry under normal service conditions. This value is always lower than the breaking strength and is established using a minimum 5:1 design factor in accordance with WSTDA and ASME guidance.
Sling angles are measured from the horizontal, not the vertical.
This is critical for proper rigging calculations.
As the angle decreases, the force on each leg increases and the
effective capacity decreases. Angles below 30° from horizontal
are not recommended without engineering approval.
Note:
Sample capacity values from Holloway Houston documentation will be placed in Section 9.
| Angle from Horizontal | Load Angle Factor |
|---|---|
| 90° (vertical) | 1.00 |
| 60° | 0.87 |
| 45° | 0.71 |
| 30° | 0.50 |
Synthetic Web Slings Hitch Types
Vertical Hitch
The sling is attached straight up and down between the load and the hook. This is the baseline condition for rated WLL.
Choker Hitch
The sling is wrapped around the load and passed through its own eye. Typical efficiency is around
Basket Hitch
The sling supports the load in a U-shape. When both legs are vertical, the capacity can approach 2x the vertical rating. As the sling legs spread, the actual capacity reduces based on the angle from horizontal.
Synthetic Flat Web Sling Inspection & Tagging
Synthetic flat web slings must be inspected at receipt, before each use, and periodically by a qualified person following OSHA 1910.184 and ASME B30.9. Users should check the sling body, eyes, and stitching for any damage that may reduce load capacity or compromise safety. Only Holloway Houston or authorized facilities may repair or re-tag slings. Unauthorized repairs or modifications are strictly prohibited as they can significantly reduce strength and safety.
Standards Met:
- ASME B30.9 – Slings (Current Edition).
- OSHA 1910.184 – Slings (Synthetic Web Slings).
- WSTDA WS-1 – Synthetic Web Sling Standard.
Remove from service if any of the following are present:
Cuts, tears, holes, or excessive abrasion.
Melted, charred, or brittle areas.
Broken or worn stitching.
Knots, chemical damage, UV degradation, or stiffness.
Missing or unreadable identification tag.
Key Performance Factors on Sling Performance
D/d Ratio (Bend Radius) :
The diameter of the surface the sling bends around (D) in relation to sling thickness (d) directly affects capacity. Small contact diameters increase stress and reduce efficiency.
Edge Protection :
Edge protection such as pads, sleeves, or corner protectors is typically applied where sharp or abrasive contact may occur.
Environmental Conditions :
High heat, UV exposure, moisture, chemical contact, and rough surfaces can all affect sling integrity and lifespan. Compatibility must be confirmed before use.
Applications and Use Cases
Flat web slings are used in industries where careful handling and load protection are critical. Their lightweight design and flexible construction make them suitable for a wide range of lifting tasks.
Marine
Industrial
Mining
Offshore (Oil & Gas)
Military
Theatrical Rigging
Construction
Outdoor Recreational
Utility
Heavy Lifting
Custom Flat Web Sling Solutions
Holloway Houston provides custom manufacturing for flat web slings to meet specialized application requirements. Customizations include :
- Non-standard lengths and widths.
- Reinforced or extended eye sections.
- Protective sleeves or edge guards.
- Special tagging and labeling requirements.
- Application-specific materials.
Custom slings are produced under the same controlled process and standards as standard Holloway Houston slings, with full traceability and documentation available upon request.
SAFETY NOTICE
This content is provided for general awareness only. It is not a substitute for formal training, professional engineering judgment, or site-specific procedures. For selection, application, or technical questions, contact the Holloway Houston team or consult a qualified rigging professional.
Frequently asked questions
Why are sling angles measured from horizontal?
Because it reflects the actual tension in each sling leg. As the sling approaches horizontal, the force increases. Measuring this way prevents miscalculation.
Are synthetic slings electrically safe?
They are non-conductive when clean and dry. Dirt, moisture, or chemicals may change this condition.
What is the difference between WLL and breaking strength?
Breaking strength is the failure point during testing. WLL is the maximum allowed load for normal use, displayed on the sling’s tag.
Where is the sling’s capacity shown?
On the permanent Holloway Houston identification tag and in the official capacity chart by document revision.
Does a choker hitch reduce capacity?
Yes. Stress is concentrated at the choke point, which reduces the overall lifting allowance.
When should a sling be removed from service?
Any visible damage, tag loss, heat exposure, fiber weakness, or stitching failure requires immediate removal.
Shop Holloway Products
Alloy Chain Slings
For Heavy-Duty Lifting Where Strength And Durability Are Essential.
Why Choose Flat Web Slings
Flat web slings are a practical choice for lifting and rigging tasks where load protection and handling matter. Their design and construction provide safety, flexibility, and efficiency for a variety of applications.
Even load distribution
Minimizes point pressure and protects delicate surfaces.
Lightweight construction
Allows easier positioning and handling.
Flexible design
Adapts to multiple hitch configurations: vertical, choker, and basket.
Compliant with OSHA 1910.184 and ASME B30.9
Supporting proper inspection and use procedures.
Permanent identification tags
Make capacity verification quick and reliable.
Durable synthetic fibers
Resist stretch, abrasion, and common lifting stresses.