Ball bearing

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Ball bearing


Ball bearing are used for low friction movements across an axis.
Wikipedia Rolling-element bearing

A ball bearing is a bearing used for low friction movements across an axis. They are cheap and widely available, mostly from the skateboard industry.


Ball bearings are usually closed and have their own lubrication, so no additional lubrication is needed.


There are several types of ball bearings:

Abbrev. Type Notes
Z Shielded, single  
ZZ Shielded, double Sufficient for most RepRaps.
RS Sealed, single  
2RS Sealed, double For keeping out generated dust and grit (e.g. from a Milling and Drilling Head)
V Non-contact seal, single  
VV Non-contact seal, double  
DDU Contact seals, double  
NR Snap ring and groove  
M Brass cage  


The most common ball bearings are:

Abbrev. Inner D. Outer D. Thickness Notes
608 8 mm 22 mm 7 mm A common roller skate bearing used extensively in RepRaps.
626 6 mm 19 mm 6 mm  
624 4 mm 13 mm 5 mm  
623 3 mm 10 mm 4 mm  
603 3 mm 9 mm 5 mm  

The 608 size ball bearings in particular are extremely low cost. Their 8 mm bore size almost forces us to mount them on:

The 626 size ball bearing have a 6 mm bore size. We can mount them on:

The 624 bearing have a 4 mm bore size. We can mount them on:

The 626 and 624 bearings seem to cost more than 608 bearings, but M6 and M4 bolts and threaded bar cost less than M8 threaded bar and bolts, so it's almost a wash.


Vendor From 8 mm 6 mm 4 mm 3 mm Additional notes
Charlie's 3D Technologies BE 608ZZ        
Paoparts FR 608ZZ 626ZZ 624ZZ 623ZZ
Reprapsource DE 608ZZ   624ZZ    
RepRap Kits UK 608ZZ   624ZZ    
3DMakerWorld US 608ZZ        
BOCA Bearings US many many many many  
VXB Ball Bearings US many many many many  
D&D-TOP Bearings CN many many many many  
Technobots UK 608ZZ
CIE Auto Source CN many many many many  
Wholesale Skateboard Bearings US 608SS       Minimum 80 pcs.
Imprimante 3D France FR 608ZZ
608ZZ (10 pcs)
626ZZ (10 pcs)
624ZZ (10 pcs)
623ZZ Paris area.

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