uxcell 6pcs U Type Groove Pulley Black Nylon Guide Rolling Bearing 8x40x20.5mm U Groove Roller Wheel for Door Window or Drive Mechanical Equipment

uxcell 6pcs U Type Groove Pulley Black Nylon Guide Rolling Bearing 8x40x20.5mm U Groove Roller Wheel for Door Window or Drive Mechanical Equipment

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. NOTE：
Please refer to the picture and select right type of bearings before your order (Sealed or Shield on BOTH or SINGLE side of the bearing). Suffix on the bearing just for differentiating between Sealed and Shield type of bearing. It would not affect the use of our product.

Description:

Single-row, pre-lubricated, normal accuracy.
Deep Groove Ball Bearings are one of the most widely used rolling bearings. They are used to accommodate radial and axial loads in both directions.
With small friction and high-limit speed, Ball Bearings are cost-effective and require little maintenance.
Chromium Steel (GCr15) made with heat treating, provides high and uniform hardness, good wear resistance
Can be used to build the track system or replace the wheel, widely used in door and window to track, or drive mechanical equipment.


Selection Guide:
Shields (Designation Suffix Z/ZZ) - High speed. Protect from dirt and debris.
Sealed (Designation Suffix RS/2RS) - Made of sheet steel reinforced nitrile butadiene rubber (oil- and liquid-resistant). Lower limit speed than Shield Bearings.

Specification:
Model: BU0840
Shielded Type: Double Shielded
Inner Race/Outer Race Material: Chrome Steel (GCr15) / Nylon
Cage Material: Stamping Steel
Inner Diameter (d): 8mm
Outer Diameter (D): 40mm
Thickness (B): 20.5mm
Groove width: 17mm
Groove depth: 5mm
Accuracy Class: P0 (ABEC1)