Hex Jam Metric

A six-sided internally threaded, non-heat treated fastener with a metric thread pitch. The jam nut is approximately 1/2 the thick-ness of a Style 2 nut. Nuts are chamfered on the top and on the bearing surface.

Class 04 metric hex jam nuts  are tightened against  the work surface and a Style 1 or Style 2 hex nut is tightened against the jam nut to keep it from loosening.