Which statement about coarse threads is accurate?

Which statement about coarse threads is accurate?

• A. They have more threads per inch than fine threads.
• B. They have fewer threads per inch and are quicker to assemble, better with softer materials.
• C. They always provide higher preload than fine threads.
• D. They are never used with soft materials.

Answer: (B)

Coarse threads are defined by a larger pitch, meaning they have fewer threads per inch than fine threads. That bigger pitch lets you engage the threads more quickly, so you need fewer turns to tighten, which makes assembly faster. The wider thread spacing also helps when working with softer materials because it resists cross‑threading during entry and distributes load over a larger flank area, reducing the chance of stripping in softer substrates like wood or soft metals. Preload isn’t guaranteed to be higher with coarse threads; preload depends on the tightening torque and friction, and both coarse and fine threads can achieve high preload under the right conditions. So, the statement that coarse threads have fewer threads per inch and are quicker to assemble, better with softer materials, best captures their practical advantages.

Coarse threads are defined by a larger pitch, meaning they have fewer threads per inch than fine threads. That bigger pitch lets you engage the threads more quickly, so you need fewer turns to tighten, which makes assembly faster. The wider thread spacing also helps when working with softer materials because it resists cross‑threading during entry and distributes load over a larger flank area, reducing the chance of stripping in softer substrates like wood or soft metals. Preload isn’t guaranteed to be higher with coarse threads; preload depends on the tightening torque and friction, and both coarse and fine threads can achieve high preload under the right conditions. So, the statement that coarse threads have fewer threads per inch and are quicker to assemble, better with softer materials, best captures their practical advantages.