| Part Number Endless |
Part Number Eye and Eye |
Vertical WLL in M Ton |
Choker Hitch WLL in M Ton |
Vertical Basket WLL in M Ton |
Approx.Wgt/Ft (lbs.) |
Recomm.Wide Body Shackles |
Body Diameter |
|---|---|---|---|---|---|---|---|
| HH-18T-SB | HH-18T-SBE | 18t | 14.4t | 36t | 0.74 | 18t | 1.27 |
| HH-25T-SB | HH-25T-SBE | 25t | 20t | 50t | 1.04 | 30t | 1.59 |
| HH-50T-SB | HH-50T-SBE | 50t | 40t | 100t | 2.09 | 55t | 2.22 |
| HH-75T-SB | HH-75T-SBE | 75t | 60t | 150t | 3.19 | 75t | 2.78 |
| HH-100T-SB | HH-100T-SBE | 100t | 80t | 200t | 4.16 | 125t | 3.34 |
| HH-125T-SB | HH-125T-SBE | 125t | 100t | 250t | 5.20 | 125t | 3.89 |
| HH-150T-SB | HH-150T-SBE | 150t | 120t | 300t | 6.24 | 150t | 4.13 |
| HH-175T-SB | HH-175T-SBE | 175t | 140t | 350t | 7.32 | 200t | 4.54 |
| HH-200T-SB | HH-200T-SBE | 200t | 160t | 400t | 8.44 | 200t | 4.74 |
| HH-225T-SB | HH-225T-SBE | 225t | 180t | 450t | 9.49 | 250t | 5.25 |
| HH-250T-SB | HH-250T-SBE | 250t | 200t | 500t | 10.53 | 250t | 5.50 |
| HH-275T-SB | HH-275T-SBE | 275t | 220t | 550t | 11.56 | 300t | 5.75 |
| HH-300T-SB | HH-300T-SBE | 300t | 240t | 600t | 12.62 | 300t | 6.10 |
| HH-350T-SB | HH-350T-SBE | 350t | 280t | 700t | 12.83 | 400t | 7.16 |
| HH-400T-SB | HH-400T-SBE | 400t | 320t | 800t | 16.79 | 400t | 7.48 |
| HH-450T-SB | HH-450T-SBE | 450t | 360t | 900t | 18.86 | 500t | 8.43 |
| HH-500T-SB | HH-500T-SBE | 500t | 400t | 1,000t | 20.95 | 500t | 8.91 |
About High Performance Slings
Silverback Slings are part of Holloway Houston’s high-performance synthetic slings, manufactured using polyester webbing reinforced with HMPE fibers. This combination provides increased tensile capacity with reduced weight, improving handling efficiency in demanding lifting operations. Compared to standard polyester or nylon slings, they maintain higher load capacity, minimal elongation, and consistent performance under repeated use.
What are Silverback Slings?
High performance silverback slings are premium-grade synthetic lifting slings manufactured by Holloway Houston, Inc.. Made from HMPE (High Modulus PolyEthylene) fibers, they span capacity ratings from approximately 8 tons up to 600 tons at a 5:1 design factor. (Holloway Houston) These slings are engineered for heavy-duty lifting, offshore mooring, extreme rigging points and situations where steel chain or wire rope slings impose too much weight or occupy too much space.
Silverback Slings are commonly used in heavy industrial lifts, offshore mooring operations, and critical rigging points where traditional wire rope or alloy chain slings add excessive weight or limit handling space. Their construction allows crews to manage large loads with less physical effort while maintaining defined Working Load Limits and consistent handling characteristics in marine and industrial environments.
High performance Silverback Slings
High Capacity
HMPE fiber construction provides high lifting strength while keeping the sling compact and manageable across a wide tonnage range.
Lightweight Design
Significantly lighter than wire rope or chain, reducing handling effort during rigging, setup, and removal.
Environmental Resistance
Resists moisture, saltwater exposure, and common industrial chemicals with minimal change to rated capacity over time.
Controlled Bend Radius
Designed for a minimum 3:1 D/d ratio to limit stress at connection points and maintain rated performance.
Design & materials of Silverback Slings
Material Grades
Silverback Slings utilize HMPE fibres, selected for their high modulus (stiffness), excellent tensile strength and low weight. Compared to aramid fibres (such as Kevlar or Technora), they provide up to 40% higher specific strength.
Configurations
Available in endless (loop) and eye-and-eye styles, Silverback Slings can be fabricated with custom lengths and termination hardware to suit various rigging applications, from single-leg lifts to multi-leg bridles. The oversized triple-cover design allows for reshaping to fit load surfaces, improving contact and reducing point stress.
| Model | Vertical WLL | Choker WLL | Basket WLL | Approx. Weight/Ft | Recommended Shackle Size |
|---|---|---|---|---|---|
| HH-18T-SP | 18 tons | 14.4 tons | 36 tons | 0.81 lbs | 18t |
| HH-25T-SP | 25 tons | 20 tons | 50 tons | 1.13 lbs | 30t |
| HH-100T-SP | 100 tons | 80 tons | 200 tons | 4.52 lbs | 125t |
Advantages of Silverback Slings
Lighter weight for equivalent capacity: Reduced rigging fatigue, fewer cranes or cranes with less capacity burden.
Better resistance to harsh conditions, suitable for offshore, marine, deep-water and chemical environments.
Higher capacity per sling diameter thanks to HMPE strength, compared to polyester or nylon round slings, Silverback offers significantly higher strength in the same size.
Reduced support hardware size because of the high-contact rigging design and efficient load distribution, smaller shackles or bearing surfaces may be used safely.
Improved handling due to lower weight and flexible design, helps when riggers must position slings manually, in tight spaces or when using aerial lifts.
Operational efficiency lighter sling weight and easier handling can translate into faster setup, less downtime and fewer manual strain injuries.
Compliance and Proof Testing
Silverback Slings are manufactured in compliance with industry standards and undergo rigorous proof testing.
Key compliance points :
- Manufactured and certified to meet or exceed guidelines in ASME B30.9 for slings and rigging hardware.
- Use of design factor 5:1 (ultimate load = 5 × rated Working Load Limit) ensures safety margin.
- Each sling receives 100% proof‐testing before shipment; serial tags, test certificates and traceability accompany each unit.
Technical Features and Customization
Holloway Houston manufactures 3 Leg wire rope bridle slings using high-quality materials and precise fabrication. Each sling is built to meet lifting requirements in industrial and offshore environments while maintaining consistent performance.
High-Contact Rigging Efficiency (HCRE)
The oversized triple-cover and parallel-laid yarn core increase fibre contact with the bearing surface, improving load transfer and allowing smaller supporting hardware.
Low elongation
Maximum elongation at breaking load is about 3.8%.
Flotation & deep-water suitability
Density of 0.97 g/cc means Silverback Slings remain stable in deep-sea applications and resist buoyancy issues.
Chemical, UV & marine environment resistance
Verified performance after saltwater immersion and exposure to harsh conditions.
Custom lengths and fittings
Holloway Houston offers tailored configurations including uneven leg lengths, special end fittings, mooring terminations or offshore‐approved attachments upon request.
Abrasion & cut resistance
Advanced cover lay and HMPE core offer superior cut protection and fibre strength compared to traditional synthetic or wire rope slings.
Selecting the Right High-Performance Silverback Slings
Load weight and centre of gravity
Confirm the sling’s rated WLL accounts for the vertical load and any reduction caused by rigging angles.
Bearing surface size (D/d ratio)
Pins, hooks, or bearing surfaces should be at least three times the sling body diameter to support proper load distribution.
Sling configuration
Single-leg, two-leg, multi-leg, or endless configurations should match the lift geometry and connection points.
Environment and exposure
Marine, chemical, high-temperature, or deepwater conditions may require specific cover options and inspection intervals.
Rigging hardware compatibility
Shackles, master links, and hooks must meet or exceed the sling body’s rated capacity.
Handling and transport
Rigging access, crew ergonomics, and handling effort should be considered, especially for higher-capacity slings.
How Sling Length Is Measured
Sling length is defined as the body length from the bearing surface of the master link to the bearing surface of the end fitting. Master link dimensions are not included in the leg length measurement. This convention removes ambiguity when arranging rigging lifts or ordering replacement assemblies.
Silverback Slings are produced in-house at Holloway Houston’s Houston facility, with full control maintained from HMPE fiber sourcing through final sling assembly. The manufacturing process includes cover fabrication, sling construction, and proof testing, allowing consistency across each unit. Every sling is tagged and prepared for immediate rigging use before delivery.
In-House Production
All stages of sling manufacturing are completed internally, allowing direct oversight of materials, assembly, and final output.
HMPE Fiber Handling
Raw HMPE fiber is sourced and processed as part of the production workflow, supporting consistent sling construction.
Proof Testing Process
Each Silverback Sling is proof-tested prior to shipment to verify performance under load.
Identification & Tagging
Finished slings are tagged with product information and supplied ready for field use.
Safety, Inspection, and Maintenance
Routine inspection and proper handling extend service life and maintain safe lifting performance:
Inspection of hardware : Ensure mating shackles, hooks and links are rated equal or higher than sling WLL and show no deformation or wear.
Proper storage : Keep slings in clean, dry area away from direct sunlight or sharp edges; avoid exposure to acids, caustics or excessive heat unless cover rated.
Replacement : Remove from service if any portion shows damaged core, significant cover wear, exposed fibers, or tag missing/illegible.
Pre-use visual inspection : Check for cover damage, cuts, abrasion, end-fitting deformation or loss of tag legibility.
Periodic documented inspection : As required by ASME B30.9 and company policy, record any findings and remove slings if criteria met.
Elongation check : If elongation exceeds 5% of original body length under known load, sling must be removed from service (adapted for synthetic sling specifics).
Maximize workplace safety with proper training.
Quality and Compliance
All Silverback Slings are fabricated at the Houston, Texas facility of Holloway Houston under rigorous quality systems. Manufacturing includes :
- Use of API-Q1 certified processes for design, calculation and load testing.
- Full traceability: Each sling is serialized, tagged and supplied with test certificates.
- 100% proof testing at the facility and optional cyclic or destructive testing upon request.
Standards Met :
- API-Q1 certified processes for design.
- Each sling is serialized, tagged and supplied with test certificates.
- 100% proof testing at the facility.
SAFETY NOTES
Always inspect prior to use. Do not exceed working load limits. Use only for approved applications. If any doubt exists regarding condition or use, discontinue immediately and consult the manufacturer.
Why choose Holloway Houston's silverback 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.
Decades of experience in heavy-lift manufacturing, rigging hardware and offshore lifting solutions.
Complete in-house fabrication ensures traceability from raw material to delivery.
Broad inventory and ability to produce custom lengths, terminations and configurations for high‐capacity lifts.
Certified quality systems, proof test facility and full documentation accompany every sling.
Dedicated service and technical support to match rigging applications with correct sling assemblies.
One supplier for lifting hardware, sling assemblies and inspection services, simplifying logistics and project coordination.