Part number designation
Model code - A (Internal thread) x L (Length) - HD(Head diameter) + Material + Finish
L3831-M4x9.5-HD10.0SBZ L3831 Insert,M4x9.5-HD10.0,Steel 1215,Blue zinc plated
L3834-M4x8.0-HD10.0B L3834 Insert with inner hexagon,M4x8.0-HD10.0,Brass C3604