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.
Import Duty Rates by Country of Origin
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Alternative Classifications
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If helical compression springs
True springs vs. washer-form springs separate.
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Import Tips & Compliance
• Music wire tensile strength certification required for material verification
• Small sizes need precise weighing for duty calculation
• Distinguish from formed wire springs (7320.20)
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.
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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.