A pen needle for use with a drug delivery device, comprising: a hub body having internal threads to receive the drug delivery device, said hub body having a projection extending outwardly proximally from said hub body and integrally formed with said hub body as a one piece member, the hub having a passageway that extends through the entire projection ; wherein said hub body has a base and a wall extending outwardly therefrom, and a post extends from said base in a direction opposite to said wall; said post removably connected to said projection within said passageway in said hub; a needle rigidly fixed to said post ; a first flange at a patient end of the post spaced axially from the projection ; a second flange on said post axially spaced towards a non-patient end from said first flange and having a diameter larger than the passageway to prevent insertion of the post into the projection past the second flange ; characterized in that a flexible tab disposed at the non-patient end of said post and extending past a nonpatient end of the projection and out of the passageway to prevent accidental withdrawal of said post from said projection ; wherein said flexible tab has a width larger than that of said projection opening; wherein said flexible tab compresses to allow removal of said post from said projection ; wherein the post is removable from the hub body by pulling the post outwardly away from the hub body such that the tab is compressed and pulled through the passageway ; wherein said post is separable from said hub body such that said needle is removed in its entirety with said post ; and wherein a length of said passageway is substantially the same as a length of said post from said second flange to said flexible tab . a hub body having internal threads to receive the drug delivery device, said hub body having a projection extending outwardly proximally from said hub body and integrally formed with said hub body as a one piece member, the hub having a passageway that extends through the entire projection ; wherein said hub body has a base and a wall extending outwardly therefrom, and a post extends from said base in a direction opposite to said wall; said post removably connected to said projection within said passageway in said hub; a needle rigidly fixed to said post ; a first flange at a patient end of the post spaced axially from the projection ; a second flange on said post axially spaced towards a non-patient end from said first flange and having a diameter larger than the passageway to prevent insertion of the post into the projection past the second flange ; characterized in that a flexible tab disposed at the non-patient end of said post and extending past a nonpatient end of the projection and out of the passageway to prevent accidental withdrawal of said post from said projection ; wherein said flexible tab has a width larger than that of said projection opening; wherein said flexible tab compresses to allow removal of said post from said projection ; wherein the post is removable from the hub body by pulling the post outwardly away from the hub body such that the tab is compressed and pulled through the passageway ; wherein said post is separable from said hub body such that said needle is removed in its entirety with said post ; and wherein a length of said passageway is substantially the same as a length of said post from said second flange to said flexible tab . <EOS>