Find HS Code and trade information for gate spring

Gate Spring

A gate spring is a mechanical component utilized to apply force and maintain a closed or open position for gates, valves, or similar mechanisms. They are integral to the operation of numerous systems requiring controlled movement and secure closure.

Material

Gate springs are commonly manufactured from:

• Spring Steel: High-carbon spring steel (e.g., SAE 677, EN 10270-1) is the most prevalent material due to its high elasticity, tensile strength, and resistance to fatigue. Often oil-tempered for enhanced durability.
• Stainless Steel: (e.g., 302, 304, 316) Employed in corrosive environments or applications demanding hygienic properties. Offers lower strength compared to spring steel but superior corrosion resistance.
• Alloy Steels: Used in specialized applications requiring specific properties like high temperature resistance or increased load capacity.
• Non-Metallic Materials: Polymer or composite springs are utilized in applications where electrical isolation or reduced weight are crucial, though less common for high-force applications.

Purpose

The primary purposes of a gate spring include:

• Positive Closure: Ensuring a gate or valve returns to a defined closed position after being opened.
• Controlled Opening Force: Providing resistance to opening, requiring a specific force to overcome the spring's tension.
• Shock Absorption: Dampening the impact of gate closure, reducing noise and wear.
• Sealing: Maintaining sufficient force on a sealing element to prevent leakage.

Function

Gate springs function by storing mechanical energy when compressed or extended. This stored energy is released when the external force is removed, returning the gate or valve to its default position. The spring constant (stiffness) dictates the force required for compression or extension.

Usage Scenarios

• Water Gates: Maintaining closure in irrigation systems, water treatment facilities, and plumbing.
• Valve Actuation: Providing force for automatic valve operation in pipelines and industrial processes.
• Check Valves: Ensuring unidirectional flow by automatically closing against backflow.
• Security Gates: Controlling the opening and closing of pedestrian or vehicular gates.
• Industrial Machinery: Used in various mechanisms requiring controlled movement and retention.
• Automotive Applications: Used in throttle return mechanisms and valve systems.

Common Types

• Coil Springs: The most widespread type, offering versatility in force and stroke length. Can be compression, extension, or torsion springs.
• Leaf Springs: Consisting of stacked leaves of spring steel, providing high load capacity and durability, commonly found in larger gate applications.
• Disc Springs (Belleville Washers): Conical-shaped springs providing high force in a small space, often used in applications requiring precise force control.
• Torsion Springs: Utilize torsional force to return a gate or valve to a specific position, often used in hinged mechanisms.
• Air Springs: Utilize compressed air to provide force, offering adjustable force and cushioning, commonly used in larger, heavier gates.
• Rubber Springs: Employ rubber’s elasticity to provide a restoring force, suitable for low-force applications and vibration dampening.

Gate springs are categorized as springs, specifically those made of iron or steel. Based on the provided information, several HS codes may be applicable depending on the specific application and characteristics of the spring.

• 7320.10.30.00: This HS code covers springs and leaves for springs, of iron or steel; leaf springs and leaves therefor; suitable for motor vehicle suspension; to be used in motor vehicles having a G.V.W. not exceeding 4 metric tons. While the term is "gate spring", if it is used for motor vehicle suspension and the vehicle's Gross Vehicle Weight (G.V.W.) is not exceeding 4 metric tons, this code applies.

  • 73: Iron or steel articles.
  • 20: Springs and leaves for springs, of iron or steel.
  • 10: Leaf springs and leaves therefor.
  • 30: Suitable for motor vehicle suspension; to be used in motor vehicles having a G.V.W. not exceeding 4 metric tons.

• 7320.10.60.60: This HS code also covers springs and leaves for springs, of iron or steel; leaf springs and leaves therefor; suitable for motor vehicle suspension; other. If the gate spring is used for motor vehicle suspension but does not meet the G.V.W. criteria of 4 metric tons, or is for a different application, this code may be applicable.

  • 73: Iron or steel articles.
  • 20: Springs and leaves for springs, of iron or steel.
  • 10: Leaf springs and leaves therefor.
  • 60: Suitable for motor vehicle suspension; other.

• 8487.90.00.80: This HS code covers machinery parts, not containing electrical connectors, insulators, coils, contacts or other electrical features, and not specified or included elsewhere in this chapter; other; other. If the gate spring is considered a component of a larger machine and does not have any electrical features, this code may be applicable.

  • 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof.
  • 87: Parts of machinery, not containing electrical connectors, insulators, coils, contacts or other electrical features.
  • 90: Other.

Regarding HS code 7320.10.30.00 and 7320.10.60.60, please note the need to verify the Gross Vehicle Weight (G.V.W.) if the spring is used in a motor vehicle. Both codes have a basic tariff of 3.2%, an additional tariff of 25.0%, and an additional tariff of 30.0% after April 2, 2025. A 25% additional tariff applies to steel and aluminum products. The total tariff rate for both codes is 83.2%.

Regarding HS code 8487.90.00.80, the basic tariff is 3.9%, the additional tariff is 25.0%, and the additional tariff is 30.0% after April 2, 2025. The total tariff rate is 83.9%.