Find HS Code and trade information for flat cushion block gauge block setting block altimeter sleeve

Flat Cushion Block, Gauge Block Setting Block, Altimeter Sleeve

These items represent precision measuring and calibration tools, frequently utilized in metrology, aerospace, and mechanical engineering. While appearing disparate, they often work in concert to ensure accurate measurements, particularly related to height and altitude.

Flat Cushion Block

• Material: Typically hardened steel, often with a surface finish like lapped or ground surfaces to achieve high precision. Other materials like ceramic are used for specific applications requiring non-magnetic properties or increased wear resistance.
• Purpose: Provides a stable, precisely defined reference surface. Used as a base for building height standards, supporting gauge blocks, or as a fixture for precise positioning.
• Function: Minimizes distortion and provides a consistent support surface, crucial for accurate measurements. The flatness is a key characteristic.
• Usage Scenarios:
  • Calibration of height gauges.
  • Setup of precision fixtures.
  • As a base for stacking gauge blocks.
  • Inspection of flatness of other surfaces.
• Common Types:
  • Square Cushion Blocks: Most common, providing a broad support area.
  • Rectangular Cushion Blocks: Used for longer spans or specific fixture designs.
  • V-Blocks with Cushion Base: Provides support for cylindrical objects.

Gauge Block Setting Block

• Material: Hardened steel, often alloy steel, known for dimensional stability.
• Purpose: Used in conjunction with gauge blocks to establish precise height dimensions. Provides a stable platform for building up height standards. Often used to create a known distance for calibrating other instruments.
• Function: Acts as a support and alignment fixture for gauge blocks, ensuring they are accurately stacked and aligned.
• Usage Scenarios:
  • Calibration of dial indicators and other measuring instruments.
  • Setting up precision jigs and fixtures.
  • Checking dimensions of parts.
  • Tooling setup.
• Common Types:
  • Solid Setting Blocks: Most common, providing a rigid base.
  • Split Setting Blocks: Allows for adjustment and fine-tuning.
  • Sine Blocks: Used with gauge blocks to establish precise angles.

Altimeter Sleeve

• Material: Typically stainless steel or aluminum alloy.
• Purpose: A precision component used within altimeters (specifically aneroid altimeters) to translate changes in atmospheric pressure into a height reading. It's a critical part of the altimeter’s mechanism.
• Function: The sleeve expands and contracts in response to changes in air pressure. This movement is mechanically linked to the altimeter’s display, indicating altitude.
• Usage Scenarios:
  • Aircraft altimeters.
  • Barometric altimeters used in mountaineering and weather forecasting.
  • Calibration of altimeters.
• Common Types:
  • Single-Expansion Sleeve: Simplest design, used in basic altimeters.
  • Multiple-Expansion Sleeve: Offers higher accuracy and sensitivity.
  • Capsule-Type Sleeve: Uses multiple capsules for increased sensitivity.

Relationship between the Items:

These tools are often used together in calibration processes. A flat cushion block provides a stable base. Gauge blocks and setting blocks are used to build precise height standards on that base. The altimeter sleeve, as a critical component of an altimeter, would be calibrated using precise height standards built with gauge blocks and supported by a cushion block to ensure accurate altitude readings. The accuracy of the altimeter relies on the precision of all these components and the calibration process.

Based on the provided information, the declared goods appear to be precision measuring tools used for calibration and setting, potentially within the context of altitude measurement or general engineering applications. These items are likely composed of metal and plastic materials.

The following HS codes are relevant:

• 9017.30.80.00: This HS code falls under Chapter 90, which covers “Instruments and apparatus which measure or check length, perimeter or level; geometric optics, photographic, cinematographic, measuring, checking, perspective, drawing or marking instruments and apparatus.” Specifically, it covers “Micrometers, calipers and gauges.” The two-digit sections mean:

  • 90: Instruments and apparatus which measure or check length, perimeter or level; geometric optics, photographic, cinematographic, measuring, checking, perspective, drawing or marking instruments and apparatus.
  • 17: Instruments for measuring length.
  • 30: Micrometers, calipers and gauges.
  • 80: Other. The total tax rate is 58.9%.

• 8207.90.45.00: This HS code falls under Chapter 82, which covers “Tools, implements, cutlery, hand tools, pneumatic, hydraulic or with self-contained non-electric motors.” Specifically, it covers “Other interchangeable tools, and parts thereof: Other: Suitable for cutting metal, and parts thereof.” The two-digit sections mean:

  • 82: Tools, implements, cutlery, hand tools, pneumatic, hydraulic or with self-contained non-electric motors.
  • 07: Interchangeable tools for handtools, whether or not power operated, or for machine-tools.
  • 90: Other interchangeable tools, and parts thereof.
  • 45: Other: Suitable for cutting metal, and parts thereof. The total tax rate is 34.8%.

• 9031.90.91.95: This HS code falls under Chapter 90, which covers “Instruments and apparatus which measure or check length, perimeter or level; geometric optics, photographic, cinematographic, measuring, checking, perspective, drawing or marking instruments and apparatus.” Specifically, it covers “Parts and accessories: Other: Other Other.” The two-digit sections mean:

  • 90: Instruments and apparatus which measure or check length, perimeter or level; geometric optics, photographic, cinematographic, measuring, checking, perspective, drawing or marking instruments and apparatus.
  • 31: Parts and accessories.
  • 90: Other.
  • 91: Other.
  • 95: Other Other. The total tax rate is 80.0%.

• 3926.90.48.00: This HS code falls under Chapter 39, which covers “Plastics and articles thereof.” Specifically, it covers “Other articles of plastics and articles of other materials of headings 3901 to 3914: Other: Photo albums.” The two-digit sections mean:

  • 39: Plastics and articles thereof.
  • 26: Other articles of plastics and articles of other materials of headings 3901 to 3914.
  • 90: Other.
  • 48: Photo albums. The total tax rate is 33.4%.

Regarding HS code 8207.90.45.00, please note that the description specifically mentions “suitable for cutting metal.” If the gauge blocks are not intended for cutting metal, this HS code may not be appropriate.