Enduro Bearings 3903 LLU-E - ABEC 3 - Doppelreihen Kugellager - 17x30x10/13mm

ABEC 3 double row radial bearing with 17 mm inner diameter, 30 mm outer diameter, 10/13 mm width with inner rim raised on one side and double lip seal with strong contact, running on in a groove in the sense of a labyrinth seal.

ABEC 3 bearings use class 10 chrome steel balls and 52100 high carbon chrome alloy treads.
The precision balls are round with a deviation of 10/1000000", which is twice as round as the industry standard.
The alloy bearing shells are vacuum fabricated and hardened to Rockwell hardness R-62. This is followed by polishing to a mirror finish for ABEC-3 precision and silent operation. The riveted steel cage increases toughness.
Manufacturer's product ID: 3903 LLU-E