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Jam Nut

Jam nuts are a low-profile hex nut used as a locknut to prevent vibration from loosening a bolted joint. Before nuts were developed with “self-locking” capabilities, two jam nuts would be tightened against each other so that nuts won’t loosen over time. The first nut is held with a wrench while the second nut is tightened or “jammed” against the first to lock both nuts in place.

  • Available with both left-handed and right-handed threads
  • Low-profile design makes this nut ideal for low clearance applications
  • Overall height is similar to a standard hex nut when jam nuts are doubled
  • Visit our Product FAQs to learn more about nuts, bolts, and screws
Jam Nut

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