Torsional Lock Washer 3/8 Inch

Steel washer with twisted tabs providing torsional resistance beyond axial spring force. Advanced non-threaded lock washer under HTS 7318.21.00. For vibration-intensive rail and mining equipment.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
πŸ‡¨πŸ‡³China5.8%+35.0%40.8%
πŸ‡²πŸ‡½Mexico5.8%+10.0%15.8%
πŸ‡¨πŸ‡¦Canada5.8%+10.0%15.8%
πŸ‡©πŸ‡ͺGermany5.8%+10.0%15.8%
πŸ‡―πŸ‡΅Japan5.8%+10.0%15.8%

More Specific Codes

This product may fall under a more specific subheading:

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

8607.29Lower: 12.6% vs 40.8%

If railway rolling stock parts

Rail-specific parts classification.

8430.50.50Lower: 35% vs 40.8%

If mining machinery components

Other mining machinery parts.

7318.29.00Lower: 37.8% vs 40.8%

If non-torsional tab washers

Plain washers lack spring action.

Not sure which classification is right?

Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.

Import Tips & Compliance

β€’ Torsion test data differentiates from standard split washers

β€’ Heavy section requires accurate weight declarations

β€’ Rail certification may trigger additional documentation

Related Products under HTS 7318.21.00

M6 Stainless Steel Split Lock Washer

A helical split ring washer made from AISI 304 stainless steel, designed to compress under bolt tension for locking action. It falls under HTS 7318.21.00 as a non-threaded spring washer of steel that prevents fastener loosening due to vibration. Commonly used in automotive and machinery assembly.

1/4 Inch Zinc Plated Spring Lock Washer

A carbon steel washer with zinc plating for corrosion resistance, featuring a split ring that provides axial flex for vibration resistance. Classified under HTS 7318.21.00 as a non-threaded lock washer of iron or steel. Ideal for construction and electrical panel fastening.

Belleville Disc Spring Washer 20mm OD

A conical steel disc washer that flattens under load to maintain tension and absorb shock. It qualifies under HTS 7318.21.00 as a spring lock washer due to its elastic deformation properties. Used in high-pressure flange and valve applications.

M10 External Tooth Lock Washer

Steel washer with radially stamped teeth that bite into mating surfaces for locking. Non-threaded design places it under HTS 7318.21.00 as a spring lock washer. Prevents rotation in electrical and appliance assemblies.

Internal Star Lock Washer #10

Stainless steel washer with inward-facing teeth for secure locking against rotation on softer materials. Falls under HTS 7318.21.00 as a non-threaded steel spring lock washer. Common in electronics and aerospace fasteners.

Wave Spring Washer 25mm ID

Pre-tempered steel washer with multiple wave undulations providing spring force in tight spaces. Classified HTS 7318.21.00 as a non-threaded lock washer with spring properties. Used in automotive transmissions and pumps.