
SC8UU Closed Linear Ball Bearing, 8mm Bore
Part number: SC8UU3D Printer & CNC Parts
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Prices updated: 13 Oct 2026
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About this product
The SC8UU is a closed linear ball bearing with an 8 mm bore, designed to run along 8 mm round steel rails. It is used in linear motion axes of CNC machines, 3D printers and small positioning systems. Its closed housing carries the load on recirculating ball bearings for smooth, low-friction travel.
Specifications
- Model
- SC8UU
- Inner diameter (bore)
- 8 mm
- Outer diameter
- 15 mm
- Length
- 24 mm
- Type
- Closed linear ball bearing
Frequently asked questions
Which rail does the SC8UU run on?
It runs on 8 mm round rails. Do not use it on 16 mm rails; for those, choose a 16 mm bearing.
What supports the rail ends for this bearing?
Use 8 mm rail end support brackets such as the SH8 listed in this set to hold the rail firmly in the frame.





