Detailed information：
Features: with two end non-contact sealing ring, can be simplified to bearing seal design host, users with high internal resistance type water grease
Including H70 series, H72 series, H719 series
Contact Angle is C: 15 °, AC: 25 °
Roller materials: steel ball (no sign), ceramics ball (HQ1)
Maintains a: outer ring guide phenolic resin maintains a (not a sign); Inner circle guide polyamide resin maintains a (TN1)
Later can choose ceramic ball

Bearing details: