Custom CNC turning stainless steel NPT thread pipe coupling

The standards for tapered thread fittings mainly include the following:

1. NPT (National Pipe Thread) Standard

• Scope: Widely used in the United States and Canada, suitable for the petroleum, natural gas, and water treatment industries.
• Thread Angle: 60 degrees.
• Tolerance: NPT threads have a broad tolerance range, commonly including Class 1 and Class 2.
• Materials: Typically use carbon steel, stainless steel, copper, etc.
• Application: Suitable for high-pressure environments and sealing connections for liquids and gases.

2. BSP (British Standard Pipe) Standard

• BSPT (British Standard Pipe Tapered):
  • Scope: Mainly used in the UK and other regions, suitable for water and gas pipe connections.
  • Thread Angle: 55 degrees.
  • Application: Suitable for sealing connections for liquids and gases.
• BSPP (British Standard Pipe Parallel):
  • Scope: Similar to BSPT but with parallel threads without taper.
  • Application: Commonly used for pipe connections in low-pressure environments.

3. ISO 7 Standard

• Scope: An international standard that specifies the dimensions and specifications for threaded pipe fittings.
• Type: Includes ISO 7-1 (standard for pipe thread joints) and ISO 7-2 (pressure test for pipe threads).
• Thread Angle: 55 degrees (tapered thread).

4. DIN 2999 Standard

• Scope: A German industrial standard for tapered pipe threads.
• Thread Angle: 55 degrees.
• Application: Suitable for pipe connections for liquids and gases.

5. JIS B 0203 Standard

• Scope: A Japanese industrial standard covering tapered thread fittings.
• Thread Angle: 55 degrees.
• Application: Widely used in various pipe connections in the Japanese market.

6. ASME B1.20.1 Standard

• Scope: Issued by the American Society of Mechanical Engineers (ASME), covering the specifications for NPT thread fittings.
• Thread Angle: 60 degrees.
• Application: Used for pipe connections for high-pressure gases and liquids.

These standards define the dimensions, thread shapes, thread angles, material requirements, and other technical specifications for tapered thread fittings to ensure compatibility and reliability in various applications. The appropriate standard should be selected based on specific application scenarios and market requirements.

In many cases, simply adhering to standard specifications may not meet the high-level sealing requirements of a design. Our precision-grade fittings can achieve standards that are up to three times stricter than the usual requirements, with a 100% compliance rate. This allows our fittings to be used in demanding applications such as the aerospace industry and ultra-high-pressure hydraulic systems. We have customized various threaded products for numerous high-end clients both in China and internationally.

Microscopic Inspection and Measurement：

Precision NPT (National Pipe Thread) fittings are primarily used for the following applications:

Petroleum and Natural Gas Industry

Used for pipeline connections to transport oil and gas, the sealing performance and pressure resistance of NPT threaded fittings make them an ideal choice.

Chemical Industry

In chemical production, precision NPT fittings are used to connect reactors, pipelines, and equipment, ensuring the safe transport and handling of media.

Water Treatment Systems

Used in water treatment equipment and pipeline systems for connections and sealing, ensuring leak-free and efficient operation.

HVAC Systems

In heating, ventilation, and air conditioning systems, NPT fittings are used for pipeline connections for cooling water, refrigerants, and other media.

Hydraulic and Pneumatic Systems

Used in hydraulic and pneumatic systems for pipeline and equipment connections, ensuring reliable sealing and safe operation under high pressure.

Pharmaceutical and Food Processing

In pharmaceutical and food processing equipment, precision NPT fittings are used for various pipeline connections, ensuring hygiene and safety.

Marine and Offshore Engineering

In marine and offshore engineering, NPT fittings are used for various pipeline systems connections, such as fuel, cooling water, and drainage.

Industrial Machinery and Equipment

Used in various industrial machinery and equipment for connections of lubrication oil, coolant, gases, and liquid pipelines.

Laboratories and Research Institutions

Used for precise pipeline connections in laboratory equipment and research facilities, ensuring accuracy and safety in experimental processes.

Due to their high precision, reliable sealing, and pressure resistance, precision NPT fittings are widely used in various fields requiring high-quality connections and sealing.