ONYX High Performance Roundslings
The ONYX sling from Slingmax is a lightweight, high-performance roundsling with a core made from 100% HMPE fiber. Designed to elevate safety, boost productivity, and streamline rigging operations, the ONYX sling is ideal for applications where weight, strength, and durability are critical.
Weighing half as much as polyester roundslings of equal capacity and less than 10% the weight of comparable multi-part wire rope slings, the ONYX sling delivers exceptional strength-to-weight ratio without compromising performance. This makes it easier to handle, faster to rig, and safer for crews—especially in complex or repetitive lifting environments.
Protected by a double-layered high quality polyester outer jacket—black on the outside and red on the inside for easy visual damage inspection—the ONYX sling is built to resist abrasion, chemicals, and wear in demanding environments. This rugged jacket construction helps maintain performance under extreme job-site conditions.
The ONYX sling is available in a wide range of capacities and configurations, with custom solutions available upon request. Proudly assembled in the USA by I&I Sling, the premier Slingmax manufacturer on the East Coast, trusted since 1986.
Advantages of ONYX Slings
O-Spec Core Yarn
Inside every Slingmax ONYX roundsling is our new O-Spec core yarn—a cost-effective, high-performance fiber engineered for reliability and consistent strength. Proudly manufactured in North Carolina, USA, O-Spec delivers reliable performance without compromising safety or quality.
Every Onyx synthetic sling also includes our patented Rifled Cover Technology®, which boosts sling efficiency and durability without adding weight. O-Spec’s construction ensures excellent fiber on fiber abrasion resistance and cycling performance.
Setting The Standard With Testing
Unlike standard industry practices, Slingmax has rigorously validated ONYX sling capacities through extensive break testing, verifying performance up to 300,000 lbs. This comprehensive testing approach distinguishes ONYX slings from competitors, who often rely solely on theoretical calculations. As a result, users can confidently depend on the proven reliability, durability, and superior safety margins provided by Slingmax ONYX slings.
Slingmax ONYX slings are single-path, high-performance roundslings designed for heavy lift. ONYX slings utilize O-Spec, an exclusive, 100% HMPE core fiber, which is made in North Carolina by Slingmax and engineered specifically to maximize strength and minimize weight.
ONYX Cover
Protecting the load-bearing core yarn of the ONYX Sling is an abrasion resistant double-layer polyester cover. This sling cover consists of two separate layers of material which provides abrasion and UV light resistance, If the outer black jacket becomes damaged, the red inner jacket will be exposed, alerting the user to remove the sling from service.
Precision Fabrication of Synthetic Slings
Every lift is critical, and precision is built into every ONYX Sling. Slings can be made with tolerances as tight as +/- 1” and you can be rest assured that slings will match when constructed in sets. ONYX slings have less than 1% elongation at their rated capacity, ensuring precise control over tight tolerances.
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Note: Capacities shown are for one complete sling. Sling ratings based on commercial fittings of equal or greater capacity. Conforms to ANSI/ ASME B30.9 Chapter 7, NAVFAC P-307 Section 14.7.4.3, the Cordage Institute Roundsling Standard and the Web Sling & Tie Down Association Roundsling Standard. This chart is based on a 5:1 Design Factor (DF) but any other DF can be fabricated. Higher capacity slings are available. CAPACITIES ARE IN POUNDS (LBS.) |
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| ONYX High Performance Roundslings Stock No. |
Vertical | Choker | Vertical Basket |
Approximate Weight (Lbs. per Ft.) (Bearing-Bearing) |
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| ONYX 500 | 5,000 | 4,000 | 10,000 | .36 |
| ONYX 1000 | 10,000 | 8,000 | 20,000 | .43 |
| ONYX 1500 | 15,000 | 12,000 | 30,000 | .51 |
| ONYX 2000 | 20,000 | 16,000 | 40,000 | .64 |
| ONYX 2500 | 25,000 | 20,000 | 50,000 | .72 |
| ONYX 3000 | 30,000 | 24,000 | 60,000 | .80 |
| ONYX 4000 | 40,000 | 32,000 | 80,000 | .97 |
| ONYX 5000 | 50,000 | 40,000 | 100,000 | 1.27 |
| ONYX 6000 | 60,000 | 48,000 | 120,000 | 1.40 |
| ONYX 7000 | 70,000 | 56,000 | 140,000 | 1.63 |
| ONYX 8500 | 85,000 | 68,000 | 170,000 | 1.88 |
| ONYX 10000 | 100,000 | 80,000 | 200,000 | 2.15 |
| ONYX 12500 | 125,000 | 100,000 | 250,000 | 2.3 |
| ONYX 15000 | 150,000 | 120,000 | 300,000 | 2.62 |
| ONYX 17500 | 175,000 | 140,000 | 350,000 | 2.95 |
| ONYX 20000 | 200,000 | 160,000 | 400,000 | 3.45 |
| ONYX 25000 | 250,000 | 200,00 | 500,000 | 4.1 |
| ONYX 30000 | 300,000 | 240,000 | 600,000 | 4.91 |
| Dimensions can vary according to the hardware or bearing points the slings are used with. | ||||
Rigging Handbook
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SYNTHETIC SLINGS
Slingmax has been a trusted supplier of high performance synthetic roundslings to the industrial and heavy lifting markets since 1986. Think Twin-Path® slings for all your heavy lifting and rigging needs.
RIGGING ACCESSORIES
The Equalizer Block is used to maintain tension on all legs of the sling during a lift. The Equalizer Block will automatically adjust itself when tension is put on the device from the sling. This was designed specifically for Twin-Path® Extra Slings.
WIRE ROPE DESIGNS
Slingmax multi-part wire rope slings are designed for increased capacity and excellent flexibility. The three-part Tri-Flex, nine-part Gator-Laid, and nine-part Gator-Flex grommet have excellent D/d ratios and can be fabricated in shorter lengths.
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