Spring washers and other lock washers
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Duty Rate (from China)
Products classified under Tariff item 7318.21
1/4 Inch Zinc Plated Spring Lock Washer
A carbon steel split ring washer with zinc plating, designed to provide axial flex and prevent fastener loosening under vibration. Its non-threaded helical split design classifies it as a spring lock washer of iron or steel.
7318.21.00Anti-Vibration Curved Spring Washer
A multi-curved steel washer that absorbs vibration through controlled deflection, providing locking action in automotive and engine applications. Its non-threaded spring design places it under this tariff item as a spring lock washer.
7318.21.00Belleville Disc Spring Washer 20mm OD
A conical steel disc washer that flattens under load to maintain tension and absorb shock, used in high-pressure flange applications. Its elastic deformation qualifies it as a spring lock washer under this tariff item.
7318.21.00Cryogenic Stainless Lock Washer
An AISI 316 stainless steel spring washer tested for cryogenic service in LNG applications, providing locking in extreme low-temperature environments. Its non-threaded spring design classifies it under this tariff item.
7318.21.00DIN 127 Spring Lock Washer Type B
A heavy-duty rectangular steel washer per DIN 127 Type B standard, designed for high preload applications in European machinery. Its non-threaded spring lock design places it under this tariff item.
7318.21.00Finger Spring Washer Assortment Pack
A set of steel washers with radial fingers that deflect to lock fasteners, assorted sizes for maintenance and MRO applications. Packaged for retail but classified as non-threaded spring lock washers under this tariff item.
7318.21.00High-Carbon Music Wire Lock Washer
A precision-formed washer from high-carbon music wire for maximum spring properties in small fasteners, used in instruments and precision equipment. Its non-threaded spring design qualifies it under this tariff item.
7318.21.00Internal Star Lock Washer #10
A stainless steel washer with inward-facing teeth that bite into softer materials for secure locking against rotation, common in electronics and aerospace. Its non-threaded design places it under this tariff item as a spring lock washer.
7318.21.00M10 External Tooth Lock Washer
A steel washer with radially stamped teeth that bite into mating surfaces to prevent rotation, used in electrical and appliance assemblies. Its non-threaded spring lock design classifies it under this tariff item.
7318.21.00M12 Dome Spring Washer
A cylindrical steel spring washer that compresses into a dome shape under load for high axial loading, applied in heavy equipment and bridge construction. Its non-threaded spring design places it under this tariff item.
7318.21.00M6 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 and prevent fastener loosening. Its non-threaded spring design classifies it under this tariff item.
7318.21.00Nord-Lock Steel Washer Pair
A patent wedge-locking washer pair with a ramp design that maintains preload through vibration, sold as a pair for wind turbines and offshore platforms. Despite pair packaging, it is classified as a spring lock washer under this tariff item.
7318.21.00Slotted Spring Lock Washer USS Size 1/2
A carbon steel washer with a slotted helical design for superior vibration resistance per USS standards, used in HVAC and plumbing fixtures. Its non-threaded spring lock design places it under this tariff item.
7318.21.00Torsional Lock Washer 3/8 Inch
A steel washer with twisted tabs providing torsional resistance beyond axial spring force, used in vibration-intensive rail and mining equipment. Its non-threaded lock design classifies it under this tariff item.
7318.21.00Wave Spring Washer 25mm ID
A pre-tempered steel washer with multiple wave undulations providing spring force in tight spaces, used in automotive transmissions and pumps. Its non-threaded spring design places it under this tariff item as a lock washer.