From Wikipedia, the free encyclopedia Jam nut
Jam nut
A jam nut is a low profile type of nut, typically half as tall on top of the first nut. The inner nut is then slackened
as a standard nut. It is commonly used as a type of lock- back and tightened against the outer nut.
nut, where it is "jammed" up against a standard nut to Note that jam nuts can be unreliable under signifi-
lock the two in place. It is also used in situations where a cant loads. If the inner nut is torqued more than the out-
standard nut would not fit. er nut, the outer nut may yield. If the outer nut is torqued
A jam nut can also refer to any nut that is used in the more than the inner nut, the inner nut may loosen up.[1]
same function. [2]
Use References
A jam nut is often used when a nut needs to be locked in [1] Barrett, Rich, Fastener Design Manual,
place without clamping against another object. The jam http://www.designnotes.com/companion/
nut essentially acts as the "other object", as the two nuts barrett.html, retrieved Mar/20/2009 .
are tightened against each other. They can also be used [2] The Use of Two Nuts to Prevent Self Loosening,
to secure an item on a fastener without applying force to http://www.boltscience.com/pages/twonuts.html,
that object. This is achieved by first tightening one of the retrieved Dec/31/2011 .
nuts onto the item. Then the other nut is screwed down
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Categories:
• Nuts
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