Full Ceramic Bearing 1/4" x 1/2" x 3/16" Miniature OFNA Bearing the internal thread size is

the internal thread size is M22x1

NU208M Bearing

and double rubber seals for protection

KLF110 Mojave 110 (87 & 88)

Balls: Zirconia (ZrO₂) Ceramic

Full Ceramic Bearing 1/4" x 1/2" x 3/16" Miniature OFNA Bearing the internal thread size isR188 Full Ceramic Ball Bearings 1 4" x 1 2" x 3 16" inch Full Ceramic R188 Ball Bearings, measures an inner diameter of 1 4", outer diameter is 1 2" and the width is 3 16", a standard bearing size commonly used in a variety of industrial and commercial applications, Bearing is made from Ceramic. R188 Ball bearings Full Ceramic Ball bearings Cage Material: PTFE (Polytetrafluoroethylene) Closures: Open Balls: Made from Zirconia Ceramic (ZrO) Races