Nyloc

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Type of locking fastener used where resistance to vibration is important.

Hardware available at Poly Tech

From http://www.thefastenersite.com/glossary:

A Nyloc Nut is a nut that has a special locking feature for a more tightened grip. This special locking feature is achieved by a nylon insert. Nyloc Nut is a special type of a nut that is used in variety of applications due to the fact that the nylon insert protects the bolt thread against variety of liquids (oil, petroleum substances, water, acids etc.). Nyloc Nut is a patented product by Forest Fasteners.