The GRACEL series uses a patented ball retainer that prevents ball-to-ball contact. In standard linear guides, balls colliding create vibration and noise. The Series 38 1 design reduces noise by up to 8 dB and allows for "lubrication-free" operation for short-term maintenance cycles.
The HMM GRACEL Series 38 1 is designed for lithium soap-based grease (NLGI Grade 2). For a standard 8-hour shift: hmm gracel series 38 1
For end users — from civil protection agencies to infrastructure planners — migrating to 38.1 is recommended if: The GRACEL series uses a patented ball retainer
One noted limitation: Series 38.1 currently does not support co-seismic triggering (earthquake-landslide interaction). That feature is planned for GraceL Series 39. One noted limitation: Series 38