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Grade 100 Coupling LinkDesigned to connect same size chain and accessories togetherGrade 100 Alloy SteelIncrease in Working Load Limit by at least 25% as compared to a similar product in Grade 80Tough Powder coat FinishHeavy Duty retaining collarEasy (hammer together) assemblyProof tested and certified
The Versatility of Mechanical Coupling
In the rigging and lifting industry, flexibility is as critical as strength. The Grade 100 Coupling Link (Removable) provides a modular solution for constructing custom chain slings. Its "Hammerlock" mechanism allows riggers to assemble complex sling configurations on-site using only a hammer and a drift punch. This removability is essential for periodic inspections, where components must be separated to check for internal wear, or for reconfiguring slings to meet changing project requirements.
Advanced Metallurgy and Heat Treatment
The exceptional performance of TopOne Grade 100 components is a result of precise metallurgical control. By utilizing high-grade alloy steel (containing Chromium, Nickel, and Molybdenum), the link achieves a high strength-to-weight ratio. The Quenching and Tempering (Q&T) process is meticulously managed to ensure a "high-quality finish because of the controlled deoxidation and uniform heat distribution." This process results in a tempered martensite structure that provides "superior impact toughness because of the refined grain boundaries," preventing brittle failure even in sub-zero temperatures.
Engineering for Safety
• Secure Retention: The central locking pin is supported by a stainless steel spring or a heavy-duty retaining sleeve that creates an interference fit. This ensures the pin "remains un-movable under vibration because of the constant radial pressure exerted by the locking collar."
• Fatigue Resistance: Each link is engineered to withstand 20,000 cycles at 1.5 times the WLL, meeting the fatigue-rated requirements for modern industrial cranes and hoists.
• Traceability: Every component is embossed with the material grade (10 or 100), size, and a unique batch code, ensuring "full traceability because of the rigorous documentation of the manufacturing process from raw material to final test."
The following dimensions and load limits are based on international standards for Grade 100 mechanical coupling links.
| FOR CHAIN | A | C | O | R | P | S | WEIGHT (lbs) | WORKING LOAD LIMIT |
| 7/32 | 0.55 | 0.71 | 0.71 | 1.77 | 0.31 | 0.30 | 0.15 | 3,000 |
| 9/32 | 0.63 | 0.79 | 0.75 | 2.05 | 0.41 | 0.35 | 0.31 | 4,300 |
| 5/16 | 0.71 | 0.98 | 0.91 | 2.44 | 0.47 | 0.37 | 0.44 | 5,700 |
| 3/8 | 0.91 | 1.18 | 1.06 | 2.78 | 0.47 | 0.47 | 0.77 | 8,800 |
| 1/2 | 1.06 | 1.54 | 1.34 | 3.54 | 0.79 | 0.67 | 1.63 | 15,000 |
| 5/8 | 1.30 | 1.57 | 1.54 | 4.13 | 0.87 | 0.81 | 2.58 | 22,800 |
| 3/4 | 1.65 | 1.81 | 1.81 | 4.45 | 1.14 | 0.98 | 4.52 | 35,300 |
| 7/8 | 1.93 | 2.17 | 2.28 | 5.24 | 1.18 | 1.10 | 8.83 | 42,700 |
| 1 | 2.24 | 3.35 | 3.25 | 7.56 | 1.57 | 1.18 | 14.99 | 59,700 |
| 1-1/4 | 3.15 | 3.33 | 3.70 | 8.11 | 1.85 | 1.38 | 25.35 | 90,400 |
The Grade 100 Coupling Link (Removable) is manufactured and tested to meet or exceed the following global standards:
• EN 1677-1: Components for slings - Safety - Part 1: Forged steel components, Grade 8. (Modified for Grade 100 increased load capacity).
• ASTM A952/A952M: Standard Specification for Forged Grade 100 Alloy Steel Lifting Components.
• ASME B30.26: Rigging Hardware - Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings.
• AS 3776: Lifting components for Grade T(80) and V(100) chain slings.
Testing and Quality Assurance
• 100% Proof Testing: Every unit is proof loaded to 2.5 times the WLL to ensure "structural integrity because of the rigorous load-testing protocols."
• Magnaflux Inspection: Components undergo electromagnetic crack detection (MPI) to ensure they are "free from surface defects because of the non-destructive testing of every batch."
• Dimensional Verification: Critical dimensions are checked against standardized tolerances to ensure perfect fitment with chains and master links.
Safety and Maintenance
• Assembly: Ensure the locking pin is driven completely through both halves and the retaining collar. The pin should be flush with the body of the link.
• Inspection: Regularly inspect for nicks, gouges, or cracks. Remove from service if wear at any point exceeds 10% of the original dimension.
• Temperature Limits: Suitable for use in temperatures ranging from -40°F to 400°F (-40°C to 204°C) without reduction in WLL.
• Discard Criteria: Replace the link if the locking pin becomes loose or if the retaining collar shows signs of deformation.
