Iron or steel; non-threaded spring washers and other lock washers

HS v2022 Code: 731821

About iron or steel; non-threaded spring washers and other lock washers

HS code 731821 covers the import and export of iron or steel non-threaded spring washers and other lock washers. These fastening components play a crucial role in a wide range of industries, from automotive and construction to machinery and electronics. As an essential part of many mechanical assemblies, the global demand for these products remains consistently high, making this industry an important contributor to the broader international trade landscape.

Production process

The production of non-threaded spring washers and other lock washers typically involves a combination of stamping, coiling, and heat treatment processes. Manufacturers begin by cutting steel sheets or wire into the desired shapes and sizes, then use specialized machinery to form the washers and apply any necessary heat treatments to achieve the desired level of strength and flexibility. Quality control measures, such as dimensional inspections and surface finish checks, are crucial throughout the manufacturing process to ensure the final products meet industry standards.

Production inputs

The primary inputs for the production of HS code 731821 items are high-quality steel, either in the form of sheets or wire. Manufacturers also require specialized stamping and coiling equipment, as well as access to reliable energy sources and skilled labor to operate the machinery. Depending on the specific application, additional materials such as lubricants or protective coatings may also be necessary to enhance the performance and durability of the final products.

Production outputs

The main outputs of this industry are non-threaded spring washers and other lock washers, which are widely used in a variety of applications. These fasteners are often consumed by industries such as 870000 Vehicles, 840000 Machinery, and 850000 Electrical machinery, where they play a critical role in securing components and ensuring the proper functioning of assemblies. The versatility of these products makes them an essential part of the global supply chain for a wide range of manufactured goods.

Revisions to 731821

Classification codes are adjusted frequently. The code may have been revised or replaced between system versions. The table below shows the history (newest to oldest) of the code 731821. The most recent 1 version of this code (731821) is in the HS v2022 system (this version):

This page shows the most recent version of code 731821.

Family tree for iron or steel; non-threaded spring washers and other lock washers

    graph LR
    A["<a href='/classifications/hs/v2022/73'>73: Iron or steel articles</a>"]
A --> B["<a href='/classifications/hs/v2022/7318'>7318: Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles, of iron or steel</a>"]
B --> C["<a href='/classifications/hs/v2022/731821'>731821: Iron or steel; non-threaded spring washers and other lock washers</a>"]

    B --> D["<a href='/classifications/hs/v2022/731811'>731811: Iron or steel; threaded coach screws</a>"]
B --> E["<a href='/classifications/hs/v2022/731812'>731812: Iron or steel; threaded wood screws other than coach screws</a>"]
B --> F["<a href='/classifications/hs/v2022/731813'>731813: Iron or steel; threaded screw hooks and screw rings</a>"]
B --> G["<a href='/classifications/hs/v2022/731814'>731814: Iron or steel; threaded self-tapping screws</a>"]
B --> H["<a href='/classifications/hs/v2022/731815'>731815: Iron or steel; threaded screws and bolts n.e.c. in item no. 7318.1, whether or not with their nuts or washers</a>"]
B --> I["<a href='/classifications/hs/v2022/731816'>731816: Iron or steel; threaded nuts</a>"]
B --> J["<a href='/classifications/hs/v2022/731819'>731819: Iron or steel; threaded screws, bolts and nuts n.e.c. in item no. 7318.1</a>"]
B --> K["<a href='/classifications/hs/v2022/731822'>731822: Iron or steel; non-threaded washers, excluding spring and lock</a>"]
B --> L["<a href='/classifications/hs/v2022/731823'>731823: Iron or steel; non-threaded rivets</a>"]
B --> M["<a href='/classifications/hs/v2022/731824'>731824: Iron or steel; non-threaded cotters and cotter-pins</a>"]
B --> N["<a href='/classifications/hs/v2022/731829'>731829: Iron or steel; non-threaded articles, n.e.c. in item no. 7318.2</a>"]

    

    %% Color coordination by level

    classDef level1 color:#000,fill:#a8f9ff,stroke:#333,stroke-width:2px
    classDef level2 color:#000,fill:#e0a458,stroke:#333,stroke-width:1px
    classDef level3 color:#000,fill:#419d78,stroke:#333,stroke-width:1px
    classDef level4 color:#000,fill:#c04abc,stroke:#333,stroke-width:1px
    classDef level5 color:#000,fill:#f1c40f,stroke:#333,stroke-width:1px
    classDef level6 color:#000,fill:#f1c40f,stroke:#333,stroke-width:1px
    classDef highlight color:#000,fill:#fff,stroke:#000,stroke-width:5px



  %% Apply classes
  class A level2
class B level4
class C level6
class D level6
class E level6
class F level6
class G level6
class H level6
class I level6
class J level6
class K level6
class L level6
class M level6
class N level6

  class C highlight

  %% class A level1
  %% class B,C level2
  %% class D,E,F,G,H,I level2
  %% class J,K,L,M,N,O,P level3
  %% class C highlight