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

HS v2017 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 components are essential fasteners used across a wide range of industries, from automotive manufacturing to construction. As a critical part of many mechanical assemblies, the global trade in these products plays a significant role in supporting industrial activity and economic growth worldwide.

Production process

The production of non-threaded spring washers and lock washers typically involves stamping or punching techniques. Steel coils or sheets are fed into automated presses that cut, form, and shape the washers to the required specifications. Heat treatment processes may also be employed to impart the desired spring and locking properties. Manufacturers utilize advanced quality control measures to ensure consistent product performance and reliability.

Production inputs

The primary inputs for this industry include 7213 Bars and rods, hot-rolled, in irregularly wound coils, of iron or non-alloy steel and 7209 (Flat-rolled products of iron or non-alloy steel, of a width of 600 mm or more, cold-rolled (cold-reduced), not clad, plated or coated). Specialized machinery, such as stamping presses and heat treatment equipment, are also essential resources for producers of HS code 731821 items.

Production outputs

The non-threaded spring washers and lock washers classified under HS code 731821 are used as components in a wide range of finished products. They are commonly found in 8708 Parts and accessories of motor vehicles as well as 8415 Air conditioning machines, comprising a motor-driven fan and elements for changing the temperature and humidity, including those machines in which the humidity cannot be separately regulated. The outputs of this industry support the assembly and maintenance of various mechanical systems across multiple sectors.

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 page shows a legacy version of code 731821 ( HS v2017).

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

    graph LR
    A["<a href='/classifications/hs/v2017/73'>73: Iron or steel articles</a>"]
A --> B["<a href='/classifications/hs/v2017/7318'>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/v2017/731821'>731821: Iron or steel; non-threaded spring washers and other lock washers</a>"]

    B --> D["<a href='/classifications/hs/v2017/731811'>731811: Iron or steel; threaded coach screws</a>"]
B --> E["<a href='/classifications/hs/v2017/731812'>731812: Iron or steel; threaded wood screws other than coach screws</a>"]
B --> F["<a href='/classifications/hs/v2017/731813'>731813: Iron or steel; threaded screw hooks and screw rings</a>"]
B --> G["<a href='/classifications/hs/v2017/731814'>731814: Iron or steel; threaded self-tapping screws</a>"]
B --> H["<a href='/classifications/hs/v2017/731815'>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/v2017/731816'>731816: Iron or steel; threaded nuts</a>"]
B --> J["<a href='/classifications/hs/v2017/731819'>731819: Iron or steel; threaded screws, bolts and nuts n.e.c. in item no. 7318.1</a>"]
B --> K["<a href='/classifications/hs/v2017/731822'>731822: Iron or steel; non-threaded washers, excluding spring and lock</a>"]
B --> L["<a href='/classifications/hs/v2017/731823'>731823: Iron or steel; non-threaded rivets</a>"]
B --> M["<a href='/classifications/hs/v2017/731824'>731824: Iron or steel; non-threaded cotters and cotter-pins</a>"]
B --> N["<a href='/classifications/hs/v2017/731829'>731829: Iron or steel; non-threaded articles, n.e.c. in item no. 7318.2</a>"]

    

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    classDef level2 color:#000,fill:#e0a458,stroke:#333,stroke-width:1px
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    classDef level6 color:#000,fill:#f1c40f,stroke:#333,stroke-width:1px
    classDef highlight color:#000,fill:#fff,stroke:#000,stroke-width:5px



  %% Apply classes
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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