An elastic nut serves as a locking fastener wherein__________________?
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Answer: C. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
Explanation
Elastic lock nuts feature a built in polymer or nylon insert inside the upper recess. As the bolt threads advance, they permanently cut mating threads into the nylon material. The tight frictional grip generated by the deformed polymer prevents vibrational loosening. Locknuts are specialized fasteners designed to resist loosening under severe shock and vibration. Nylon insert lock nuts are commonly referred to commercially as prevailing torque nuts. The polymer ring provides consistent radial clamping pressure against the male fastener threads.
These fasteners are widely used in automotive suspensions and aerospace structural assembly work. They eliminate the need for traditional split pins or separate spring lock washers. Elastic nuts can lose holding torque if repeatedly removed and reinstalled many times. Jam nuts rely on tightening two opposing nuts against each other rather than using nylon. Slotted nuts require external cotter pins passing through transverse holes to secure them. Screwed central slots describe clamp nuts rather than standard elastic polymer insert fasteners.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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