61908 Deep Groove Ball Bearings Open Design, Self-retaining
The 61908 Single-row deep groove ball bearings are widely used in various rotating machinery, such as: electric motors (general-purpose motors, household appliances), automotive wheel hubs, industrial gearboxes, agricultural machinery, pumps and compressors, conveying equipment, and power tools.
The 61908 bearing is a Deep groove ball bearings open design, self-retaining with an inner diameter of 40 mm , an outer diameter of 62 mm, a width of 12 mm. It typically uses PN grade precision tolerances and GCr15SiMn rings, Its dynamic radial rated load is approximately 14407 N, its static radial rated load is approximately 9814 N. It uses CN standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: NTN 6908A , KOYO 6908 , NSK 6908 , SKF 61908ADR.AY40 , FAG 61908 , NACHI 6908 , MRC 1908S , TORRINGTON,FAFNIR 9308K ,
61908 bearings ( 40 mm x 62 mm x 12 mm) have the advantages of simple structure, ability to withstand radial and bidirectional axial loads, low friction, and high speed, it is suitable for high-speed, low-noise applications, and are therefore widely used in the Motors, home appliances, automobiles, pumps, compressors, conveying equipment and general industrial machinery.
| Part Number | 61908 |
| Reference From | FAG 61908 |
| Bearing Type | Deep groove ball bearings open design, self-retaining |
| Series | 619 |
| Sealing | Open |
| Cage | JN = Stamping steel cage |
| Radial internal clearances | CN |
| Heat stabilization | SN = (up to 120 °C) |
| Lubricant | Without |
| Weight [lb] | 0.258 |
| Cr Radial Dynamic [lbf] | 3238 |
| C0r Radial static [lbf] | 2206 |
| Cur Radial Fatigue [lbf] | 125 |
| nB Reference speed [rpm] | 9943 |
| nG Limiting speed [rpm] | 15738 |
| Operating temperature - T(min) [°C] | -30 |
| Operating temperature - T(max) [°C] | 120 |
| d φ Inside [inch] | 1.575 |
| D Φ Outside [inch] | 2.441 |
| B Width [inch] | 0.472 |
| D2 [inch] | 2.256 |
| r(min.) [inch] | 0.024 |
| D1 [inch] | 2.169 |
| d1 [inch] | 1.846 |
| Mounting dimensions | |
| da(min.) [inch] | 1.701 |
| Da(max.) [inch] | 2.315 |
| ra(max.) [inch] | 0.024 |
| Coefficient - F0 [inch] | 15.5 |
The 61908 Single-row deep groove ball bearings mainly consist of an inner ring, outer ring, steel balls, and a cage. The raceways are deep grooves, with the steel balls making four-point contact with the raceways. The inner and outer rings can be separable or integrated. They are available in various forms, including open, with dust covers, and with seals.
Single-row deep groove ball bearings have a simple structure and are the most widely used. They can simultaneously withstand radial loads and bidirectional axial loads, making them suitable for high-speed operation. They have a low coefficient of friction, low noise, and are easy to install and maintain. Versions with seals or dust covers effectively prevent contaminant intrusion and are suitable for various operating conditions.
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