Zinc-Plated Steel Belleville Disc Spring Washer M10
Conical disc-shaped washer of zinc-plated steel that provides high load capacity in small spaces. It qualifies under HTS 7318.21.0090 as an 'other' lock washer due to its spring action for locking and vibration resistance. Used in heavy machinery and valves.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If internally threaded for nut integration
Threaded lock washers designed to engage bolts internally go to 7318.24.
If safety pins or cotter-like with spring function
Pin-type safety devices with spring washers shift to Chapter 73 pins heading.
If bulk unfinished discs for further fabrication
Unfinished springs or leaves are classified separately from finished washers.
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Import Tips & Compliance
• Plating thickness specs must be documented to confirm steel base material
• Test reports proving spring deflection properties aid in classification disputes
• Avoid combining with nuts in packaging to prevent set classification
Related Products under HTS 7318.21.00.90
Stainless Steel Split Lock Washer M6
A helical split ring washer made of stainless steel, designed to provide axial flexibility and prevent loosening of fasteners under vibration. It falls under HTS 7318.21.0090 as a non-threaded spring lock washer of iron or steel, distinct from plain washers. Commonly used in automotive and machinery assemblies.
High-Carbon Steel Wave Spring Lock Washer 5/16 Inch
Wave-shaped spring washer of high-carbon steel for friction locking in low-load applications. Classified as HTS 7318.21.0090 'other' lock washer due to non-threaded spring design. Common in electronics and automotive trim.
A4-80 Stainless Conical Lock Washer M8
Conical spring lock washer in A4-80 marine-grade stainless for superior corrosion resistance. HTS 7318.21.0090 covers this as 'other' non-threaded steel lock washer. Used in marine hardware and outdoor equipment.
Black Oxide Steel Internal Tooth Lock Washer #8
Steel washer with internal teeth that bite into nut faces for locking, finished in black oxide. Non-threaded lock type under HTS 7318.21.0090. Suited for electrical enclosures.
Spring Steel External Tooth Lock Washer M5
External serrated teeth on spring steel washer dig into surfaces for secure locking. HTS 7318.21.0090 as other lock washer. For sheet metal and chassis assembly.
Music Wire Crinkle Washer 3/8 Inch
Crimped edge spring washer from music wire (high-tensile steel) for light locking. Fits HTS 7318.21.0090 non-threaded lock category. Electronics and appliance use.