uxcell 4pcs U Type Groove Pulley Black Nylon Guide Rolling Bearing 8x40x20.5mm U Groove Roller Wheel for Door Window or Drive Mechanical Equipment
Special Features
- BU0840 (I.D.=8mm, O.D.=40mm, Thickness=20.5mm)
- BU0840 bearings are shielded on both sides to keep lubricant in
- Chromium Steel long-life bearings, smooth and low noise
- ABEC Tolerance 1 (P0), Z1 Noise Level for most general use
- Can be used to build the track system or replace the wheel, widely used in door and window to track, or drive mechanical equipment.
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