also reversible thus utilizing its wear surface area more completely the center die section end die sections and jaw die extensions are composed of austinetic manganese steel application_number US 49391174 A description a jaw crusher of the type contemplated herein as seen in fig1 includes a frame 10 having a fixed jaw 12 and a movable jaw 14 each jaw 12 and 14 includes respectively a jaw die assembly 16 and a jaw assembly which are used to crush stone that is fed into the top of the jaw crusher the movable jaw is reciprocated by means of an eccentric shaft 20 driven off of a fly wheel 22 a toggle assembly 24 is generally provided at the base of the movable die to prevent damage to the movable die in the event the crusher becomes clogged the jaw die assemblies 16 and 18 are locked into position by means of a wedge plate or extension 26 mounted at the top of the jaw die assemblies and held in position by a threaded bolt 28 and nut 30 in accordance with the invention each of the jaw die assemblies 16 and 18 is a multiple unit which varies in size but is generally made up by the same elements in this regard and referring to the jaw die assembly 18 shown in fig2 and 3 the assembly includes a jaw die grid 32 a jaw die center section 34 a lower end section 36 and an upper end section 38 the center die section 34 is welded to the grid 32 to form a permanent assembly with the grid 32 the end sections 36 and 38 are placed on the grid 32 in abutting engagement with the edges of the center section 34.