Filter system having key-fit attachment between holder and filter connector

A filter connector for a filter in a machine system comprising:

• a connector body including a flange extending circumferentially around a central opening centered on a longitudinal axis, the flange having a media-attachment side facing a first axial direction, and the connector body further including a mounting wall projecting in a second axial direction from the flange;
• the mounting wall including an axial end surface, a plurality of arcuate base surfaces, and a peripheral surface extending axially between the axial end surface and the flange;
• the peripheral surface being formed by a plurality of thread sections each including threads, and a plurality of slot sections;
• the plurality of arcuate base surfaces each formed at an axial location between the flange and the threads and facing the second axial direction;
• the plurality of slot sections are in an alternating arrangement, circumferentially around the longitudinal axis, with the plurality of thread sections, and are each recessed in a radially inward direction relative to the plurality of thread sections;
• and
• each of the plurality of slot sections extending from the first axial end surface to one of the plurality of arcuate base surfaces.

A filter holder comprising:

• a holder body having a central opening formed therein centered on a longitudinal axis, and including a radially inward wall and a radially outward wall each extending circumferentially around the longitudinal axis and projecting in a first axial direction, and an outlet pipe section fluidly connected to the central opening and projecting in a second axial direction;
• the radially inward wall including a radially inward peripheral surface, and the radially outward wall including a radially outward peripheral surface;
• and
• each of the radially inward peripheral surface and the radially outward peripheral surface being formed by a plurality of thread sections each including threads, and a plurality of slot sections defined between adjacent ones of the plurality of thread sections, in an alternating arrangement circumferentially around the longitudinal axis.