Created on 02.20

How to Identify and Use Different Thread Types

Threaded connections are essential in industries such as automotive, hydraulic systems, and construction. Correctly identifying and using the right thread type ensures compatibility, leak prevention, and system reliability. This guide will explain how to identify and properly use various thread types for different applications.
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1. How to Identify Thread Types

1.1. Measuring Thread Diameter
External Threads (Male): Measure the outer diameter with a caliper.
Internal Threads (Female): Measure the inner diameter of the threaded hole.
1.2. Determining Thread Pitch
• Use a thread pitch gauge to measure the distance between adjacent thread crests.
• Metric threads are measured in millimeters, while Unified and NPT threads are measured in threads per inch (TPI).
1.3. Identifying Thread Profiles
Metric Threads: Typically have a 60° angle with a rounded crest and root.
Unified Threads (UNC/UNF/UNEF): Similar to metric threads but measured in inches.
BSP Threads: Have a 55° angle and are common in British and European systems.
NPT Threads: Tapered profile designed to create a seal when tightened.

2. How to Use Different Thread Types

2.1. Metric and Unified Threads
• Ensure the correct diameter and pitch are matched for a secure fit.
• Use thread lubricants to reduce friction and prevent galling.
2.2. BSP and NPT Threads
Parallel Threads: Use gaskets or O-rings for sealing.
Tapered Threads: Tighten until the threads form a tight seal. Apply thread sealant if needed.
2.3. JIS and SAE Threads
• Ensure proper compatibility with the mating part.
• Use torque specifications to avoid over-tightening.

3. Common Mistakes to Avoid

Cross-Threading: Ensure threads are aligned before tightening.
Over-Tightening: Can damage threads and compromise sealing.
Mixing Thread Types: Mismatched threads can lead to leaks or system failure.

4. Choosing the Right Thread Type

When selecting a thread type, consider the following factors:
System Pressure: Use high-pressure thread types like NPT or BSPT for hydraulic applications.
Sealing Requirements: Choose parallel or tapered threads based on sealing needs.
Application Standards: Ensure threads meet industry or regional standards (e.g., ISO, SAE).
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5. JETE FITTINGS: High-Quality Threaded Solutions

At JETE FITTINGS, we offer a wide range of threaded fittings and adapters that meet international standards. Our products are designed to ensure compatibility and leak-free performance. Visit jetefittings.com to explore our full range of threaded solutions.

Conclusion

Accurately identifying and using the right thread type is essential for system performance and reliability. By following proper measurement and usage techniques, you can ensure leak-free connections and long-lasting performance. Trust JETE FITTINGS for all your threaded connection needs.

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