4-Pack LME12UUAJ 12mm Adjustable Bushing 12x22x32 Linear Motion Bearing outer diameter 270 the NU315MY inner diameter is

the NU315MY inner diameter is 75mm

like high-RPM motors

LR5004NPP Double Row ball bearing

1/8" x 1/2" x 11/64" inch

ball tracks

4-Pack LME12UUAJ 12mm Adjustable Bushing 12x22x32 Linear Motion Bearing outer diameter 270 the NU315MY inner diameter is4 Linear Ball Bushing Item LME12UUAJ Works with 12mm Shafts 4 Pieces LME12UUAJ Linear Motion Ball Bushing work with a 12 mm Shafts, Size is 12mmx 22mmx 32mm, the Inner Diameter is 12mm, the Outer Diameter is 22mm and the Length is 32mm. Bearings have Built in Rubber Seals LME12UUAJ Bearings Linear Motion Ball Bushing Number of Ball Circuit: 4 Size: 12mm x 22mm x 32mm Inner Diameter: 12mm Outer Diameter: 22mm Length: 32mm Quantity: Four Bearings