HS Code for Steel nuts

Steel nuts are classified under HS code 731816 because they fall within the broader category of screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, washers, and similar articles of iron or steel. Specifically, heading 7318 is divided into threaded and non-threaded articles. Since nuts are inherently threaded components designed to mate with a bolt or screw to fasten parts together, they are categorized under the threaded section. Subheading 731816 is the specific international designation for threaded nuts made of iron or steel. The classification is determined by the physical characteristic of internal threading and the material composition of ferrous metal. This code is used globally to track the trade of fasteners that provide clamping force in mechanical assemblies, construction, and automotive manufacturing. It is important to note that this code applies regardless of the nut's shape or specific locking mechanism, provided the primary material is iron or steel and it features internal threads.

Products Included

• Hexagonal nuts (hex nuts)
• Square nuts
• Wing nuts
• Lock nuts (including nylon insert nuts)
• Flange nuts
• Cap nuts (acorn nuts)
• Slotted nuts and castle nuts
• Coupling nuts

Common Misclassification

Steel nuts are frequently confused with other fasteners in the 7318 heading. A common error is classifying them under 731815, which is reserved for bolts and screws; while they are often sold together, they must be classified separately. Another misclassification occurs with 731822, which covers non-threaded washers. If a nut is made of stainless steel, some jurisdictions may require classification under specific stainless steel subheadings, though 731816 remains the primary global standard for threaded steel nuts. Additionally, nuts made of copper alloys must be moved to chapter 74.

FAQ

What is the HS code for steel nuts?

The primary HS code for threaded nuts made of iron or steel is 731816.

Does this code include stainless steel nuts?

Yes, 731816 generally covers threaded nuts of iron or steel, including stainless varieties, although some regional tariffs may provide specific statistical suffixes for stainless steel grades.