Abstract: A spin-on filter cartridge includes a housing, a filter media, first end cap, and a thread ring. The thread ring extends between an open mouth of the housing and the first end cap. The thread ring is a single-piece structure having a first region, a second region, and a third region. The first region is secured to the housing. The second region is axially and radially spaced from the first region. The second region is threaded for selective attachment to a suitably threaded filter head. The third region is axially spaced from the first and second regions. The third region defines a fluid aperture arrangement therethrough. The second and third regions are radially spaced from the housing wall. A filter assembly includes a filter head having a spud and a threaded wall. A spin-on filter cartridge is operably mounted and dismounted on the filter head. Methods of installing and servicing includes fluids filters of the type described.