| Part Number | 688 |
| Bearing type | BALL |
| Structure | Single Row |
| Load Direction | Radial |
| Seal type | Open |
| Bore diameter(d) | 8mm |
| Outer diameter(D) | 16mm |
| Width(B) | 4mm |
| material | Chrome steel 52100(Gcr15) |
| ring material | Chrome steel 52100(Gcr15) |
| cage material | 300 Series Stainless Steel |
| ball material | Chrome steel 52100(Gcr15) |
| shields material | 300 Series Stainless Steel |
| Grade | ABEC-1(higher grade available) |
| Clearance | C0(other clearance available) |
| BALL SIZE(mm) | 2mm |
| BALL QTY | 10 |
| lubrication | grease(oil available) |
| Temperature Range | -30℃~130℃ |
| weight(g) | 3.11 |
| ISO9001:2015 | PASSED |
| REACH | PASSED |
| ROHS | PASSED |
| Dynamic Load Rating (Cr) | 1064 N |
| Static Load Rating (Cor) | 474 N |
Ball bearings are belong to one of rollings bearings which are widely used in life, they are characterized by simple structure, low friction resistance, high speed and easy to use etcs, they can be used for applications that support moderate radial load or both moderate radial and axial load at the same time, and also for moderate axial load.they can operate at very high speeds for some special applications such as dental turbine,the speed can be RPM400000 or even more. The parts of ball bearings include inner ring,outer ring,retainer,balls,grease,shields or rubber seals. Compared with other type of rolling bearings, ball bearings are simple in structure and easy to achieve higher manufacturing accuracy, with a low manufacturing costs, so they are easy to be produced in large quantities and widely used. There are open type, with shields or rubber seals for ball bearing.Usually ball bearings are also called deep groove ball bearings.
8mm ball bearings is referred a miniature ball bearings with a bore diameter 8mm.
688 is one of 8mm ball bearings in Runstar. It is with a bore diameter 8mm,a outer diameter 16mm, and a width4mm, and it is designed to support the dynamic load rating 1252 N. It is a very pop size for motor,fishing reel or skating board etc. Runstar has other size for 8mm ball bearings for choices.
BEARING INTERCHANGE
| RUNSTAR | NMB | NTN | ADR | GRW | EZO | TIMKEN |
| 688 | L-1680 | 688 | X8 | 688 | 688 |
