---
title: Parallel Thread
description: Parallel threads, also known as straight threads, maintain a consistent diameter along their entire length.
---

[Glossary ](https://www.daiwalance.com.vn/glossary)

# [Parallel Thread](https://www.daiwalance.com.vn/glossary/parallel-thread)

 作成者: [大和鋼管工業株式会社](https://www.daiwalance.com.vn/glossary/author/daiwast)｜2025.01.02

Parallel threads, also known as straight threads, maintain a consistent diameter along their entire length. Unlike taper threads, which have a gradually changing diameter, parallel threads provide uniformity and precision, making them ideal for applications where a tight seal is not the primary requirement but where alignment and stability are critical.

Key Characteristics of Parallel Threads

- **Uniform Diameter**: The diameter remains constant from one end of the thread to the other, ensuring even distribution of force along the thread.
- **Thread Profile**: Similar to taper threads, the thread profile can be V-shaped or trapezoidal, depending on the specific application requirements.
- **Thread Direction**: Parallel threads can be right-hand or left-hand, with the right-hand threads being more common and tightening when turned clockwise.

Important Considerations When Using Parallel Threads

- **Sealing Components**: Since parallel threads do not provide a natural seal, appropriate sealing elements like washers, O-rings, or thread sealants must be used.
- **Thread Compatibility**: Ensure the male and female threads are compatible in terms of size and profile to avoid issues during assembly.
- **Torque Application**: Over-tightening can damage the threads or the sealing components. Follow recommended torque specifications for optimal performance.

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