Lancashire Lightning have set Northants Steelbacks a target of 166 in the T20 Blast final.
The opening partnership of Ashwell Prince and Alex Davies scored 77 before Davies fell for 47.
Karl Brown then fell for a duck, but Prince continued onto 43.
Joss Buttler added 27 and Aaron Lilley scored 22 not out.
Shahid Afridi posted Northamptonshire's best bowling figures of 3-14.
