1. Product Overview The F6904-2RS is an integrated flanged miniature deep groove ball bearing with one-piece positioning flange and double-sided 2RS rubber lip seals. Standard dimension 20×37×9mm, capable of bearing radial load and slight bidirectional axial load. The outer flange limits axial displacement without extra retaining rings, double rubber seals block dust, cutting fluid and splashes, widely used in automation linear guides, miniature positioning shafts, packaging