Waterproof cable gland play a key role in various industrial and special environments, and their thread types directly affect the sealing performance and mechanical strength of the equipment. Common thread types include internationally accepted metric threads, North American standard NPT threads, and PG threads commonly found in traditional European equipment.

Different thread types are suitable for different application scenarios and environmental conditions. Choosing the right thread type is crucial to ensuring the safe and stable operation of the equipment. Based on the knowledge points in this article, you can quickly understand the advantages and disadvantages of waterproof cable gland thread types and application scenarios.

Thread Types of Waterproof Cable Gland and Their Application Scenarios

The principal thread types for waterproof cable gland and their typical application scenarios include the following:

👉1. Metric Thread

• Description: The most widely used international standard, conforming to ISO specifications.
• Applications: Suitable for a variety of industrial automation equipment and instrumentation due to its high degree of standardization and compatibility.
• Common Specifications: M12, M16, M20, M25, etc., to accommodate different cable diameters.
• Features: Excellent sealing performance, especially when used with rubber gaskets, achieving high waterproof ratings such as IP67 and IP68.

👉2. NPT Thread (National Pipe Thread)

• Description: American national standard tapered pipe thread with self-sealing properties.
• Applications: Predominantly used in North American markets and related equipment, ideal for electrical and industrial facilities.
• Features: Provides mechanical strength and reliable sealing through tightening, making it suitable for high waterproofing requirements.

👉3. PG Thread (Panzer-Gewinde)

• Description: German standard thread, commonly found in older European equipment.
• Applications: Mechanical equipment and various industrial fields, especially where strong mechanical protection is needed.
• Common Specifications: PG7, PG9, PG11, PG16, etc.
• Features: Structural design is well-suited for waterproof sealing.

👉4. Other Types (e.g., BSP, G Thread)

• Description: Includes BSP (British Standard Pipe Thread), G thread (ISO 228), etc., depending on regional and industry standards.
• Applications: Primarily used in specific industrial equipment and pipeline connections that require particular waterproof and mechanical properties.

Waterproof Cable Gland Application Scenarios

Industrial Automation: Metric and NPT threads are widely used to ensure cable sealing and mechanical strength.

Outdoor Lighting & New Energy Charging Stations: Require high waterproof ratings (such as IP68) and corrosion resistance, often using metric threads with brass or stainless steel.

Mechanical Equipment & Marine Electrical: PG and other standard threads are used for mechanical protection and waterproofing.

Special Environments: In marine engineering, mining, and other harsh environments, select thread types with high protection and corrosion resistance for stable cable connections.

Waterproof cable gland utilize different thread types for mechanical fixing and sealing, primarily metric, NPT, and PG threads. The choice of thread type depends on equipment standards, application environment, and protection requirements to ensure safe and reliable cable connections.

Advantages and Limitations of Waterproof Cable Gland Types in Different Application Scenarios

👉Metric Thread

Advantages:

• Internationally recognized and compliant with ISO standards, facilitating global procurement and equipment compatibility.
• Straight thread design for easy installation and stable sealing performance.
• Wide range of specifications (e.g., M12-M63) to suit various cable diameters.
• Strong corrosion resistance, suitable for harsh environments (salt spray, oil, weak acids/bases).

Limitations:

• Minimum standard size (like M12) fits slightly larger cable diameters than PG thread; special reducers are needed for very fine cables.
• Some older European equipment or specific industries still require non-metric threads such as PG.

Typical Applications: Industrial automation equipment, control cabinets, instrumentation, outdoor lighting, new energy.

👉NPT Thread (National Pipe Thread)

Advantages:

• Tapered design with self-sealing properties, effectively preventing liquid and gas leakage; ideal for high protection and high-pressure environments.
• Longer thread length, suitable for multi-layer or thick-walled equipment.
• Preferred for North American and related standard equipment to ensure compliance.

Limitations:

• Primarily used in North America; less universal internationally.
• Installation requires precise torque control to avoid damaging the seal or causing disassembly issues.
• Not compatible with straight thread accessories; requires special locking parts and gaskets.

Typical Applications: Petrochemical, food processing, marine engines, North American electrical equipment, high-pressure and high-corrosion environments.

👉PG Thread (Panzer-Gewinde)

Advantages:

• German standard with a long history, suitable for older European equipment and some mechanical applications.
• Detailed specifications, ideal for fine cables (e.g., PG7 for cables above 2.5mm), advantageous for small-diameter cable connections.
• Design is well-suited for waterproof sealing and strong mechanical protection.

Limitations:

• DIN 46320 standard has been replaced by IEC 62444 (metric thread); PG thread usage is declining.
• New equipment should prioritize metric threads; PG threads are mainly for maintenance or special needs.
• Not fully compatible with metric threads, complicating procurement and inventory.

Typical Applications: Mechanical equipment, legacy European standard equipment, special industrial maintenance.

👉Other Thread Types (e.g., G Thread/BSP)

Advantages:

• Meets specific industry or regional standards, suitable for specialized industrial pipelines or equipment interfaces.

Limitations:

• Limited usage; selection depends on industry-specific standards.

Thread Type Comparison Table

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Choosing the right waterproof cable gland specification is fundamental to ensuring equipment safety and stable operation. Whether you work in industrial automation, marine engineering, or power equipment, understanding different thread standard and protection ratings will make your projects more reliable and efficient.

• Metric threads have become the first choice in industrial automation and new energy fields due to their international standardization and wide applicability.
• NPT threads have self-sealing properties and are suitable for the North American market and high-pressure, high-corrosion environments.
• PG threads are mainly used for the protection of old European equipment and machinery, and are now gradually being replaced by metric threads.
• Choosing the right thread type for waterproof cable connectors can help improve the protection level and service life of the equipment and ensure the reliability of the connection.
• Correctly matching the device interface and application environment is the key to achieving efficient protection.

If you are looking for high-quality waterproof cable gland with a wide range of specifications, feel free to contact us. We offer professional customization and technical support to help you solve all your waterproof gland challenges, ensuring your equipment runs safely and efficiently!

Still worried about choosing the right gland? Send us an inquiry now and start your journey to efficient protection!

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