G80 alloy chain, also known as Grade 80 or Grade 8 chain, is a high-strength, heat-treated alloy steel chain specifically designed and approved for overhead lifting and industrial rigging. It is characterized by a minimum tensile strength of 800 N/mm² and is typically marked with “8”, “80”, or “G80” on its links for identification.
Grade 80 chains are manufactured to meet rigorous international safety requirements to ensure reliability under extreme stress.
Safety Factor: These chains typically feature a 4:1 safety factor, meaning the minimum breaking force is four times the Working Load Limit (WLL). Some specialized lifting slings may use a 5:1 factor.
Material: Constructed from heat-treated alloy steel, often containing manganese, nickel, chromium, and molybdenum for enhanced durability and impact resistance.
Standards Compliance: High-quality G80 chains conform to major standards such as EN 818-2 (European), ASME B30.9 (US), and ISO 7597.
Temperature Range: Generally usable from -40°F to 400°F (-40°C to 200°C) without reduction in WLL. At higher temperatures (up to 1000°F), the WLL must be significantly derated.
Due to its strength-to-weight ratio, G80 chain is the industry standard for various heavy-duty tasks.
Overhead Lifting: Used in cranes, hoists, and as the primary component in multi-leg lifting slings.
Load Securing: Employed in trucking and logistics for securing heavy cargo on flatbeds (G80 transport or binder chains).
Marine & Fishing: Often galvanized or painted (e.g., yellow) for mooring, towing, and dredging in corrosive saltwater environments.
Mining & Construction: Ideal for dragging and recovery operations due to high abrasion resistance.
Inspection: OSHA requires visual checks before every shift. Chains must be removed from service if wear exceeds 10% of the original link diameter or if any elongation (stretch) exceeds 3%.
Identification: Always verify the “G80” stamp and ensure all attached hardware (hooks, master links) is also Grade 80 or higher to maintain system integrity.
Common Sizes & Specifications:
