The present invention relates to a dose setting mechanism for a drug delivery device and a method of using same. The mechanism comprises a drug delivery device housing (17), a dose dial sleeve (9) positioned at least partly in the housing (17) and being rotatable during dose setting and dose delivery, a clutch (13) rotatable during dose setting and non-rotatable during dose delivery, and a clutch nut (15), that is threadedly engaged with the clutch (13) and is splined to the housing (17) to prevent rotation of the clutch nut (15).
