51309 Stamping Steel Cage, Bore 45 Mm, Axial Deep Groove Ball Bearings, Single Direction
The 51309 Thrust ball bearings are widely used in various small and medium-sized equipment requiring axial load capacity, including: automotive steering systems, machine tool spindles, industrial gearboxes, crane hooks, centrifuges, and precision instruments.
The 51309 bearing is a Axial deep groove ball bearings, Single direction with an inner diameter of 45 mm , an outer diameter of 85 mm, a width of 28 mm. It typically uses PN (ABEC-1) grade precision tolerances and GCr15, GCr15SiMn rings, GCr15, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 74867 N, its static axial rated load is approximately 139584 N. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: NSK 51309, NTN 51309, FAG 51309, SKF 51309, STEYR 51309, KOYO 51309, NACHI 51309, SNR 51309,
51309 bearings ( 45 mm x 85 mm x 28 mm) have the advantages of Suitable for high-speed applications, capable of withstanding unidirectional axial loads, with low friction and easy installation, and are therefore widely used in the Machine tool spindles, automotive steering systems, pumps, industrial machinery and instruments.
| Part Number | 51309 |
| Bearing Type | Axial deep groove ball bearings, Single direction |
| Interchangeable | FAG 51309 |
| Cage | JP = Stamping steel cage |
| Accuracy class | PN (ABEC-1) |
| Series [lb] | 513 series (513) |
| Bearing Mass - m | 1.3492 |
| Dimension | |
| Inside - d φ [inch] | 1.7717 |
| Outside - D Φ [inch] | 3.3465 |
| Thickness - T [inch] | 1.1024 |
| D1 [inch] | 1.8504 |
| d1 [inch] | 3.3465 |
| chamfer - r(min.) [inch] | 0.0394 |
| Performance | |
| Dynamic Axial - Ca [lbf] | 16830 |
| Static Axial - C0a [lbf] | 31378 |
| Fatigue Axial - Cua [lbf] | 1409 |
| Speed ratings (grease) - nB [min–1] | 6771 |
| Speed ratings (oil) - nG [min–1] | 3563 |
| Mounting dimensions | |
| da(min.) [inch] | 2.7165 |
| Da(max.) [inch] | 2.4016 |
| ra(max.) [inch] | 0.0394 |
| Minimum load coefficient | |
| A | 0.12 |
The 51309 Thrust ball bearings mainly consist of a shaft ring (which mates with the shaft), a housing ring (which mates with the bearing housing), steel balls, and a cage. They feature a separable design for easy installation and maintenance. Some models include dust covers or sealed structures.
Thrust ball bearings have high axial load capacity, are suitable for bearing pure axial loads, have high limiting speeds, low friction coefficients, and smooth operation. Their separable structure simplifies installation, results in a compact size, and minimizes space requirements.
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