Jam nut

From Wikipedia, the free encyclopedia

This page will be copied to Wiktionary using the automated transwiki process. The information in this article appears to be better suited to a dictionary than to encyclopedia. Wikipedia is not a dictionary and this article meets the Wiktionary's criteria for inclusion. Wiktionary does not have an article on this word or phrase, as verified using the search page. If this page does not meet the criteria, please remove this notice. Otherwise, the notice will be automatically removed after transwiki completes.

A jam nut is a type of locking nut that avoids compresson of the part being fastened. It is commonly used to fasten parts that must be able to spin freely, such as bearings. It looks like a thin hex nut, but half as tall. It is threaded inside of and tightened against a full-thickness nut. This puts opposing tension on a localized segment of the screw thread, preventing either loosening or tightening of the pair.