Spring washers and other lock washers
Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel: > Non-threaded articles: > Spring washers and other lock washers
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified 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.
M12 Dome Spring Washer
Cylindrical steel spring washer that compresses into dome shape under load for high axial loading. HTS 7318.21.00 covers this non-threaded steel lock washer design. Applied in heavy equipment and bridge construction.
Slotted Spring Lock Washer USS Size 1/2
Carbon steel washer with slotted helical design for superior vibration resistance per USS standards. Non-threaded spring lock washer under HTS 7318.21.00. Standard for HVAC and plumbing fixtures.
Finger Spring Washer Assortment Pack
Set of steel washers with radial fingers that deflect to lock fasteners, assorted sizes for maintenance. Packaged for retail but classified HTS 7318.21.00 as non-threaded spring lock washers. For toolboxes and MRO applications.
High-Carbon Music Wire Lock Washer
Precision-formed from music wire (high-carbon steel) for maximum spring properties in small fasteners. HTS 7318.21.00 non-threaded steel spring washer. Used in instruments and precision instruments.
DIN 127 Spring Lock Washer Type B
Heavy-duty rectangular steel washer per DIN 127 Type B standard for high preload applications. Non-threaded spring lock washer HTS 7318.21.00. For European machinery standards compliance.
Cryogenic Stainless Lock Washer
AISI 316 stainless steel spring washer tested for -196°C service in LNG applications. HTS 7318.21.00 non-threaded steel lock washer with special properties. For cryogenic piping and valves.
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.
Nord-Lock Steel Washer Pair
Patent wedge-locking washer pair (ramp design) that maintains preload through vibration. Sold and classified as spring lock washers under HTS 7318.21.00 despite pair packaging. For wind turbines and offshore platforms.
Anti-Vibration Curved Spring Washer
Multi-curved steel washer profile absorbing vibration through controlled deflection. Non-threaded spring lock washer HTS 7318.21.00 for automotive suspension and engine mounts.