How to Identify Chain Grade and What Type of Chain to Use

Why Identifying Chain Grade and Type Matters

Understanding how to identify chain grade is critical for safety, compliance, and performance. Different chain grades are designed for specific load capacities, environments, and applications. Using the wrong type of chain can lead to premature wear, deformation, or failure under load.

Chain grade identification helps determine whether a chain is suitable for lifting, towing, securing, or general utility use. It also allows users to match the chain correctly with hooks, shackles, and other rigging components.

How to Identify Chain Grade by Markings

The most reliable method for identifying chain grade is inspecting the markings stamped directly on the chain links. Manufacturers typically mark every few links with grade indicators that correspond to strength and application standards.

• Grade numbers such as 30, 43, 70, 80, or 100 stamped on the link
• Manufacturer symbols or identification codes
• Occasional letter markings indicating alloy material

If no markings are present, the chain grade cannot be verified and should not be used for load-rated or overhead lifting applications.

Identifying Chain Grade by Material and Finish

Visual and physical characteristics can provide supporting clues when determining how to identify chain grade. While not a substitute for stamped markings, material type and surface finish help narrow down what type of chain is being used.

Carbon Steel and Proof Coil Chains

Lower-grade chains such as proof coil or high test chains are usually made from carbon steel and may feature a plain, zinc-plated, or galvanized finish. These chains are typically used for light-duty securing and general utility tasks.

Alloy Steel Load Chains

Higher-grade chains used for lifting are made from heat-treated alloy steel. These chains often have a darker finish and a more uniform, precise link shape, indicating higher manufacturing tolerances.

What Type of Chain Is Used for Common Applications

Knowing what type of chain is appropriate depends on the intended use. Chains are categorized not only by grade but also by function, such as lifting, towing, or load securement.

• Utility and decorative chains for non-load-bearing use
• Transport chains for load securement on vehicles
• Alloy lifting chains for overhead lifting operations
• Marine chains designed for corrosion resistance

Each type of chain is engineered with specific mechanical properties that align with its application requirements.

Common Chain Grades and Their Typical Uses

Using Measurements to Help Identify Chain Type

When markings are unclear, measuring the chain can help determine what type of chain it may be. Link diameter, pitch length, and internal width often correspond to standardized chain sizes associated with specific grades.

Measurements should be compared against manufacturer specifications or industry charts to avoid incorrect assumptions about load capacity.

Why Unverified Chains Should Not Be Load Rated

Chains without identifiable grade markings should never be used for lifting or critical load-bearing applications. Without confirmed grade and material properties, safe working limits cannot be established.

In these cases, replacing the chain with a properly marked and certified alternative reduces risk and supports compliance with safety standards.

Matching Chain Grade With Hooks and Fittings

Correct chain identification also ensures compatibility with hooks, connectors, and other rigging hardware. All components in an assembly should match or exceed the chain grade to maintain a consistent working load limit.

Using mismatched components can reduce overall system strength and compromise operational safety.