| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 4016931010 | Doc | 57.5% | CN | US | 2025-05-12 |
| 4016935010 | Doc | 57.5% | CN | US | 2025-05-12 |
| 4006100000 | Doc | 40.4% | CN | US | 2025-05-12 |
| 4006905000 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8484100000 | Doc | 57.5% | CN | US | 2025-05-12 |
| 8484900000 | Doc | 57.5% | CN | US | 2025-05-12 |
| 3926904510 | Doc | 58.5% | CN | US | 2025-05-12 |
| 3916905000 | Doc | 60.8% | CN | US | 2025-05-12 |
| 3916903000 | Doc | 61.5% | CN | US | 2025-05-12 |
O-ring
An O-ring is a simple, yet widely used, mechanical seal in the form of a torus (doughnut-shape). It is typically made of an elastomeric material, commonly rubber, but can also be constructed from other materials like polymers, metals, or ceramics depending on the application.
Material:
- Nitrile Rubber (NBR): Most common material, offering good resistance to oil, fuels, and water. Economical and versatile.
- Viton (FKM): Excellent resistance to high temperatures, chemicals, and oils. More expensive than NBR.
- Ethylene Propylene Diene Monomer (EPDM): Good resistance to water, steam, and weathering. Commonly used in outdoor applications.
- Silicone: Excellent temperature resistance and flexibility. Suitable for food and medical applications.
- Fluorosilicone: Combines the properties of silicone and fluorocarbon, offering good resistance to fuels, oils, and chemicals.
- Polyurethane: High abrasion resistance and strength.
- Metals (e.g., Stainless Steel, PTFE-coated): Used in high-pressure or high-temperature applications where rubber is unsuitable.
Purpose:
The primary purpose of an O-ring is to create a static or dynamic seal, preventing leakage of fluids or gases. They are used in a wide range of applications to seal components.
Function:
O-rings function by being compressed between two mating surfaces. This compression deforms the O-ring, filling any gaps and creating a tight seal. The sealing effectiveness depends on factors like the O-ring's material, size, compression, and the surface finish of the mating components.
Usage Scenarios:
- Hydraulic and Pneumatic Systems: Sealing cylinders, pumps, valves, and fittings.
- Automotive Industry: Sealing fuel injectors, oil pans, and transmission components.
- Aerospace Industry: Sealing fuel systems, hydraulic actuators, and engine components.
- Plumbing: Sealing faucets, pipes, and connections.
- Industrial Machinery: Sealing pumps, valves, and bearings.
- Electronics: Sealing enclosures and connectors.
- Food and Beverage Industry: Sealing pumps, valves, and processing equipment.
Common Types:
- Standard O-rings: The most common type, available in a wide range of sizes and materials.
- X-rings: Similar to O-rings but with a larger cross-section, providing improved sealing performance and longer life.
- Quad Rings: Four-lobed design, offering superior sealing performance in dynamic applications.
- Backup Rings: Used to prevent extrusion of the O-ring in high-pressure applications.
- Cord O-rings: Supplied as continuous lengths of material that can be cut to size.
- Encapsulated O-rings: O-rings encased in another material, such as PTFE, for improved chemical resistance.
- Bonded O-rings: O-rings bonded to other components, such as metal rings, for easier installation and improved sealing performance.
O-rings are gaskets, washers, and seals commonly used in various applications to prevent leakage. Based on the provided information, several HS codes may be relevant depending on the material and specific use of the O-ring.
Here are the relevant HS codes:
- 4016931010: This HS code covers “Other articles of vulcanized rubber other than hard rubber: Other: Gaskets, washers and other seals: Of a kind used in the automotive goods of chapter 87 O-Rings”. This specifically applies to O-rings used in automotive applications (Chapter 87). The total tax rate is 57.5%, comprising a basic tariff of 2.5% and an additional tariff of 25.0%, increasing to 30.0% after April 2, 2025.
- 4016935010: This HS code covers “Other articles of vulcanized rubber other than hard rubber: Other: Gaskets, washers and other seals: Other O-Rings”. This applies to O-rings not specifically used in automotive goods. The total tax rate is 57.5%, with a basic tariff of 2.5% and an additional tariff of 25.0%, increasing to 30.0% after April 2, 2025.
- 3926904510: This HS code covers “Other articles of plastics and articles of other materials of headings 3901 to 3914: Other: Gaskets, washers and other seals O-Rings”. This applies to O-rings made of plastic materials. The total tax rate is 58.5%, comprising a basic tariff of 3.5% and an additional tariff of 25.0%, increasing to 30.0% after April 2, 2025.
Important Note: The applicable HS code depends on the material composition of the O-ring (vulcanized rubber or plastic) and its intended use. If the O-ring is made of plastic, HS code 3926904510 is appropriate. If it is made of vulcanized rubber, HS codes 4016931010 or 4016935010 apply, depending on whether it is used in automotive goods.