The invention relates to a single-use injector comprising a housing (200)accommodatinga mechanical spring energy reservoir (50), a cylinder/piston unit (100), apiston-actuatingram (60) and a trigger unit (80), the spring-loaded piston-actuating ram beingsupportedon the housing via support rods (240) or draw hooks (250) and each contactzonebetween an individual support rod or draw hook and the piston-actuating ramrepresenting a wedge gear pairing that forces the respective support rod ordraw hookradially outwards. The housing of the injector consists of a thin-walled sheetmetal part.Said sheet metal part has at least two limbs (220, 250) arranged in parallelto each other.The sheet metal part has a least two pressure bars or at least two draw hooksthe free endsof which are bent in an angular fashion to define a supporting section for thepiston-actuating ram.
