How is the locking feature of the fiber-type locknut obtained?

How is the locking feature of the fiber-type locknut obtained?

• A. by use of an unthreaded fiber locking insert
• B. by chemical coating on threads
• C. by crimping a metal sleeve
• D. by a separate locking ring

Answer: (A)

The locking action comes from a fiber locking insert inside the nut. This insert is unthreaded and sits in the nut bore. When you tighten the bolt, the bolt threads engage with and compress the insert against the nut threads, causing the insert to deform slightly and create high friction. That friction resists rotation, so vibration or dynamic loads are less likely to loosen the nut. The other methods mentioned aren’t how a fiber-type locknut achieves its lock: chemical coatings rely on adhesives, a crimped sleeve changes the nut’s thread engagement mechanically, and a separate locking ring is a different locking design.

The locking action comes from a fiber locking insert inside the nut. This insert is unthreaded and sits in the nut bore. When you tighten the bolt, the bolt threads engage with and compress the insert against the nut threads, causing the insert to deform slightly and create high friction. That friction resists rotation, so vibration or dynamic loads are less likely to loosen the nut.

The other methods mentioned aren’t how a fiber-type locknut achieves its lock: chemical coatings rely on adhesives, a crimped sleeve changes the nut’s thread engagement mechanically, and a separate locking ring is a different locking design.