Conveyor roller Used in mining,cement,steel,harbor,etc. Standard: ... :CE, ISO, BV, SGS, etc Detailed conveyor roller idler feature: 1.Roller idlers Dia 50mm-219mm, length 190-3400mm, which ... : 45# STEEL5.Bearing: Single & Double Row Deep Groove Ball Bearing 2RZ&2Z with C3 clearance.6.Seals: Grease retaining ... : 2012 now type good quality conveyor rubber coated roller idler, ball bearing roller idler