And for anyone - is there anyone? - still following this deeply esoteric topic, here's what the SKF website says about Nilos rings:
"All-metal seals protect bearings from contaminants.
Designed to keep dirt, dust, debris and other abrasive contaminants out of ball and roller bearings, all-metal NILOS-Rings help extend bearing uptime in the harshest operating environments and industries. Precision-manufactured for robust durability, standard NILOS-Rings are produced from galvanized steel. Stainless, brass and other specialized rings are also available.
NILOS-Rings can accommodate a range of single and double-row bearing types, including:
Self-aligning ball bearings
Deep groove ball bearings
Angular contact ball bearings
Four-point contact ball bearings
Magneto bearings
Cylindrical roller bearings
Spherical roller bearings
Self-aligning roller bearings
Taper roller bearings".
So you can't say you don't know ...
