| Part Number | R188U |
| Bearing type | BALL |
| Structure | Single Row |
| Load Direction | Radial |
| Seal type | Shields |
| Bore diameter(d) | 1/4″︱6.35mm |
| Outer diameter(D) | 1/2″︱12.7mm |
| Width(B) | 3/16″︱4.762mm |
| 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) | 1.588mm |
| BALL QTY | 10 |
| lubrication | grease(oil available) |
| Temperature Range | -30℃~130℃ |
| weight(g) | 1.6 |
| ISO9001:2015 | PASSED |
| REACH | PASSED |
| ROHS | PASSED |
| Dynamic Load Rating (Cr) | 920 N |
| Static Load Rating (Cor) | 355 N |
Concave ball bearing is also called concave bearing. Concave Bearing is a bearings with a special shape in outer ring,it is usually with U groove,V groove or T groove on the surface of outer ring. Usually the concave bearing is neeed to be grinded to a very smooth surface on groove. Established in 2007,Zhangzhou Runstar Bearings Manufacturing Co.;Ltd is a professional concave Bearing manufacturer in China,we have enough experiences in designing and manufacturing high precision concave bearings for yoyo. Concave bearings from Runtar is with a grade from ABEC-1 to ABEC-7 for choice,the material could be chrome steel,stainless steel or hybrid ceramic, the most pop concave bearings for yoyo is R188U,R188V or R188T in Runstar,as well as concave bearing with 8 cut on the groove.
BEARING INTERCHANGE
| RUNSTAR | NMB | NTN | ADR | GRW | EZO | TIMKEN |
| R188 U |
