1. Product Overview 6307-2RS1/C3GJN single row deep groove ball bearing, standard metric dimension 35×80×21mm.Code Definition 6307: Medium heavy load deep groove ball base model, larger steel balls for superior radial load capacity 2RS1: Double-sided contact rubber lip seal, fully isolates dust, moisture and fine abrasive particles C3GJN: Custom widened C3 radial clearance matched with exclusive anti-high-temperature oxidation special grease Classic deep groove raceway bears