Grade 80 Links
G80 Weldless Round Ring | Forged Alloy Steel Ring - S-643
A forged alloy steel G80 weldless round ring designed for heavy-duty lifting and rigging, manufactured from quenched and tempered alloy steel to meet S-643 specifications. The ring has a 6:1 safety factor and is available in sizes from 1/2X2 to 2X13-1/2 with working load limits from 1.1T to 20T. It features a high-visibility powder coat or galvanized finish and is used in multi-leg chain slings, marine rigging, construction lifting, and towing systems.
- Catalogue Family
- Grade 80 Links
- Certificates
- EN 10204 3.1 material test certificate on request
CAD files are supplied on request via WhatsApp or email rather than published for open download.
Key Benefits
What Weldless Round Ring 643 Gives You
- Weldless design eliminates weak points from welded joints for consistent structural integrity
- 6:1 safety factor ensures high reliability under dynamic and static loads
- Quenched and tempered alloy steel provides high impact resistance and strength
- Powder coated or galvanized finish resists corrosion in harsh environments
- High-visibility orange/yellow powder coating improves safety during handling and inspection
- Fully compatible with S-643 specifications for interchangeability in industrial rigging systems
- No weld seams reduce risk of fatigue cracking under repeated loading
Application Scenarios
Where Weldless Round Ring 643 Is Used
- Multi-leg chain sling assemblies where load distribution and joint integrity are critical
- Marine and offshore operations exposed to saltwater, vibration, and cyclic loading
- Heavy lifting in construction and infrastructure projects requiring traceable, certified components
- Towing and lashing systems on trailers and transport vehicles with high dynamic loads
- Industrial rigging setups where weld defects or stress concentrations must be avoided
Who It Is For
Buyers This Product Is Built For
- Rigging contractors sourcing certified, high-strength components for critical lifts
- Marine and offshore service providers requiring corrosion-resistant, weldless hardware
- Construction companies specifying S-643 compliant rings for crane and hoist operations
- Truck and trailer manufacturers building lashing and towing systems with safety-critical parts
- Industrial maintenance teams replacing worn or damaged rings with certified replacements
Problems It Solves
Problems This Product Removes
- Welded joints failing under cyclic loading due to heat-affected zones and residual stress
- Low safety margins in rings with inadequate material treatment or unverified strength
- Corrosion damage on uncoated steel rings in marine or outdoor environments
- Lack of traceability and certification for rings used in regulated lifting operations
- Inconsistent performance across rings from different suppliers due to non-standard manufacturing
- Need to source multiple ring types from separate suppliers when a single, compliant ring is required
Technical Features
Technical Features
- Forged from quenched and tempered alloy steel for high strength and impact resistance
- Weldless construction with no welded joints to prevent failure at weak points
- 6:1 safety factor with minimum breaking load six times the working load limit
- S-643 specification compliance for interchangeability in rigging systems
- High-visibility powder coating (orange/yellow) or galvanized finish for corrosion resistance
- Working load limit and grade stamped on the ring body for traceability
- Available in sizes from 1/2X2 to 2X13-1/2 with defined a, b, and weight dimensions
Specifications
Weldless Round Ring 643 Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Grade | G80 |
|---|---|
| Material | Forged alloy steel quenched and tempered |
| Design Factor | 6:1 minimum breaking load to safe working load |
| Standard | S-643 |
| Surface Finish | Powder coated orange/yellow or galvanized |
| 1/2X2 Dimensions | a 12.7 b 50 weight 0.2 kg |
| 5/8X3 Dimensions | a 15.9 b 76 weight 0.45 kg |
| 3/4X3 Dimensions | a 19 b 76 weight 0.66 kg |
| 3/4X4 Dimensions | a 19 b 101.6 weight 0.84 kg |
| 7/8X4 Dimensions | a 22.2 b 101.6 weight 1.2 kg |
| 7/8X6 Dimensions | a 22.2 b 152 weight 1.68 kg |
| 1X4 Dimensions | a 25.4 b 101.6 weight 1.8 kg |
| 1-1/8X6 Dimensions | a 28.6 b 152.4 weight 2.8 kg |
| 1-1/4X6 Dimensions | a 31.8 b 152.4 weight 3.5 kg |
| 1-1/4X8 Dimensions | a 31.8 b 203.2 weight 4.5 kg |
| 1-1/4X10 Dimensions | a 31.8 b 254 weight 5.5 kg |
| 1-1/2X6 Dimensions | a 38.1 b 152.4 weight 5 kg |
| 1-1/2X8 Dimensions | a 38.1 b 203.2 weight 6.5 kg |
| 1-1/2X10 Dimensions | a 38.1 b 254 weight 7.9 kg |
| 1-3/4X9 Dimensions | a 44.5 b 228.6 weight 10.3 kg |
| 2X13-1/2 Dimensions | a 50.8 b 342.9 weight 19.4 kg |
Full size table on request. The catalogue publishes a full dimension and capacity table for this item. Ask on WhatsApp or by email and we will send it as a PDF.
Materials
Materials And Finishes
- Alloy steel forged then quenched and tempered for high strength and toughness
- Powder coating applied in orange or yellow for high visibility and corrosion protection
- Galvanized finish option for enhanced resistance to moisture and salt exposure
- No weld material used—structure is fully forged with no added filler metal
Manufacturing Process
How This Product Is Made
1Forging of the ring blank from alloy steel billet
2Quench and temper heat treatment to achieve G80 strength grade
3Machining of the ring to precise a and b dimensions
4Surface finishing by powder coating or galvanizing
5Stamping of WLL and grade on the ring body
6Proof load testing on every production batch
7Packing in carton boxes for export
Quality Control
Quality Control On Every Batch
- Proof load test on every production batch before release
- Dimensional tolerance check against published size table
- Material Test Certificate to EN 10204 3.1 issued with the order on request
- Visual inspection for surface defects, cracks, or coating flaws
- Breaking strength validation to confirm 6:1 design factor
- Third-party inspection accepted at the Qingdao warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the ring body
- Private label and OEM marking available
- Custom surface finish including zinc plating, powder coating, or electrophoretic black
- Custom sizes and dimensions built to a supplied drawing
- Custom carton and pallet packing configuration for warehouse or retail use
Compare
How It Compares With The Alternatives
An honest read on where this pattern wins and where another one would serve you better.
| Alternative | Honest Trade Off |
|---|---|
| Welded round ring | The weldless version eliminates the risk of weld failure at the joint and provides consistent strength throughout the ring, while a welded ring may have a weak point at the seam |
| Standard carbon steel ring | The quenched and tempered alloy steel offers higher strength and impact resistance, making it suitable for dynamic and heavy-duty applications |
| Rounded master link | The ring has a more uniform load path and better fatigue resistance than a master link with a pin, especially under multi-directional loading |
| Galvanized carbon steel ring | The G80 alloy steel ring has higher tensile strength and better fatigue life, though the galvanized finish is similar in corrosion resistance |
Use Guide
How To Use And Inspect Weldless Round Ring 643
- Verify the stamped WLL matches the calculated load before use—do not exceed the rated capacity
- Inspect the ring for deformation, coating damage, or surface cracks before each use
- Ensure the ring is not subjected to side loading or bending moments beyond its design
- Use only with compatible chain or sling components that meet the same safety standards
- Retire the ring if the marking is illegible, the finish is compromised, or the ring shows permanent deformation
- Clean and inspect the ring after exposure to saltwater or abrasive environments
Related Products
Often Ordered With This Item
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Weld-on pivoting link / Grade 80 Weld on Lifting Point
Swivel Hoist Ring/G80 Universal Swivel Eyebolt with Ring
GRADE 80 EYEBOLT/Alloy Steel Eye Bolt
G80 Welded Master Link Assembly A347
G80 Web Sling Connector
G80 European Type Coupling Link
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Answers
Weldless Round Ring 643 FAQ
What is the safety factor on these rings?
A 6:1 safety factor is used, so the minimum breaking load is six times the stated working load limit.
Are these rings compliant with S-643?
Yes. The rings are designed and manufactured to meet or exceed the S-643 specification for weldless round rings.
Can I get a Material Test Certificate?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied with the order on request.
What finishes are available?
Standard finishes are high-visibility orange/yellow powder coating or galvanized. Custom finishes including zinc plating, electrophoretic black, and powder coating in other colors are available.
Can you custom stamp my company name or tonnage?
Yes. Custom tonnage stamping, private label marking, and OEM branding are standard options.
How are they packed for export?
Rings are packed in carton boxes. We can configure the carton count and pallet pattern to suit your warehouse or retail packing needs.
What sizes are available?
Sizes range from 1/2X2 to 2X13-1/2. The full size table with a, b, and weight dimensions is provided in the specifications.
Need A Quote On Weldless Round Ring 643
Send the sizes, the finish and the quantity on WhatsApp or by email. You get a priced reply within 24 hours and a straight answer on stock.
We reply within 24 hours on WhatsApp or by email. Send a drawing, a photo or a bill of materials and we will quote it as it stands.