The primary distinction between the LMF and LMK series lies in the geometry of the mounting flange. While both serve as flanged linear motion bushings with identical internal mechanics and load ratings, their external flange designs dictate how they integrate into a machine assembly.
1. Flange Geometry
LMF Series: Features a Round (Circular) flange.
LMK Series: Features a Square flange.
2. Physical Profile & Space Optimization
LMF (Round): Due to its uniform circular flange, the LMF series typically requires a larger radial clearance around the shaft center to accommodate the mounting bolts.
LMK (Square): The square flange is trimmed flat on the sides. This design often allows for a lower "center height" (the distance from the shaft center to the mounting surface). Consequently, the LMK series is the superior choice for compact designs where vertical space is limited or where the bearing must be mounted flush against a flat surface.
3. Mounting Configuration
While both types generally utilize a standard 4-bolt fixing method, the layout corresponds to their shape:
LMF: Bolt holes are arranged in a radial pattern (Pitch Circle) around the bearing body.
LMK: Bolt holes are positioned at the four corners of the square flange.