Threads Explained: Anatomy, Fit Classes, Coarse vs Fine | Würth Knowing: In The Shop

Threads are everywhere, quietly holding the world together. In this episode of Würth Knowing, we break down the most common thread concepts you’ll actually run into: thread anatomy, fit classes, inch vs metric, and why coatings can make parts stop fitting.

Learn more about:
• Major diameter vs minor diameter vs pitch diameter
• Pitch + threads per inch (TPI)
• Unified thread classes (Class 1–5) and what “A” vs “B” means
• How coatings change fit (and why it’s a bigger deal than you’d think)
• Metric thread callouts and why the “tight vs loose” scale flips
• Coarse vs fine threads: speed vs precision

What topic should we break down next: thread gauges, torque, or coatings?
Drop it in the comments.👇

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