MR Series (Miniature) Deep Groove Ball Bearings
Material: Chrome Steel (Gcr15) / Stainless Steel (440C)
Structure: Single Row / Deep Groove / Miniature (Metric)
Precision: P0, P6, P5, P4 (ABEC-1 / ABEC-3 / ABEC-5 / ABEC-7)
Sealing: Open / ZZ / 2RS
Cage: Pressed Steel / Polyamide
Clearance: C2, C0, C3
Bore Range: 1mm – 10mm
Application: Dental handpieces, miniature motors, RC models, fishing reels, precision instruments
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The MR Series miniature deep groove ball bearings deliver precision-grade performance in bore sizes from 1mm to 10mm, using the highest-quality chrome or stainless steel with precision ABEC-grade tolerances. The miniature metric dimensions enable ultra-small precision mechanisms. Trusted in dental handpiece turbines, miniature DC motor armatures, RC model racing engines, fishing reel spindles, and precision instrumentation bearings.
Technical Specifications
| Bearing No. | Bore (d) mm | Outer Dia. (D) mm | Width (B) mm | Dyn. Load Cr (kN) | Stat. Load Cor (kN) | Ref. Speed (rpm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| MR52 | 2 | 5 | 2.5 | 0.28 | 0.09 | 60000 | 0.0003 |
| MR62 | 2 | 6 | 2.5 | 0.33 | 0.09 | 56000 | 0.0004 |
| MR63 | 3 | 6 | 2.5 | 0.33 | 0.09 | 48000 | 0.0004 |
| MR74 | 4 | 7 | 2.5 | 0.40 | 0.13 | 45000 | 0.0005 |
| MR84 | 4 | 8 | 3 | 0.49 | 0.21 | 40000 | 0.0008 |
| MR85 | 5 | 8 | 2.5 | 0.41 | 0.13 | 38000 | 0.0005 |
| MR95 | 5 | 9 | 3 | 0.51 | 0.22 | 34000 | 0.0009 |
| MR104 | 4 | 10 | 3 | 0.51 | 0.22 | 34000 | 0.0011 |
| MR105 | 5 | 10 | 3 | 0.51 | 0.22 | 30000 | 0.0010 |
| MR106 | 6 | 10 | 3 | 0.51 | 0.22 | 28000 | 0.0009 |
| MR117 | 7 | 11 | 3 | 0.64 | 0.27 | 26000 | 0.0011 |
| MR126 | 6 | 12 | 4 | 0.89 | 0.43 | 24000 | 0.0021 |
| MR128 | 8 | 12 | 3.5 | 0.74 | 0.34 | 22000 | 0.0014 |
| MR137 | 7 | 13 | 4 | 1.08 | 0.56 | 20000 | 0.0025 |
| MR148 | 8 | 14 | 4 | 1.08 | 0.56 | 19000 | 0.0027 |
