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 .