The present invention relates to a lid fastening part (17) for fixing the position of the injection needle lid (7) relative to the housing (2) of an automatic injector (1), wherein the lid fastening part (17) A cover beam 7.1 disposed in the housing 7 and biased radially outwardly, a stop 2.12 disposed within the housing 2, a recess 2.13 formed on the proximal side of the stop 2.12, A cap 11 coupled to the housing 2 and configured to prevent distal translation of the needle cap 7 relative to the housing 2 so that when the cap 11 is in place, After the part of the beam 7.1 lies in the recess 2.13 and the needle cover 7 is relatively fastened to the housing 2 of the automatic syringe 1 the cover beam 7.1 is moved to the stop 2.12 . The present invention also relates to an automatic syringe (1) and a method of assembling such an automatic syringe (1).
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