... ,BSW,ISO,JIS,UNI etc. 3.Surface:plain,zinc plated,black oxide,hot dip galv.etc. 1.Size:m6-m242.Standard ... ,BSW,ISO,JIS,UNI etc.3.Surface:plain,zinc plated,black oxide,hot dip galv.etc.4.Material:low carbon steel ... ,normal small boxed,gunny bag,special small boxed etc. Hex thin nut