NACHI 5204 Double Row Angular Contact Ball Bearing, Open, 20x47x20.6 mm
Available
This NACHI range covers 20 double row angular contact ball bearings with open (no seals or shields), from 15 to 70 mm bore (outer diameters 35 to 150 mm, widths 15.9 to 63.5 mm): 10 in the 52 series and 10 in the 53 series. Select the size from the drop-down: each size has its own bearing number, load ratings and limiting speeds in the Model Details.
A double row angular contact ball bearing is built like two single row bearings mounted back-to-back in one unit. It carries radial load, moment load and axial load in both directions, but because fewer balls fit in each row it has less load capacity than an equivalent back-to-back pair of single row bearings. The contact angle is 20° (no letter in the bearing number) and the cage is pressed steel.
Where this product is used
- Pumps and compressors
- Gearboxes and speed reducers
- Shaft positions that need radial, moment and bidirectional axial load support from one bearing
- General industrial machinery
Features
- Open design with no seals or shields: both grease and oil limiting speeds apply
- Two rows of balls at a 20° contact angle carry radial, moment and axial load in both directions
- Pressed steel cage
- Basic dynamic load rating 11.9 to 163 kN across the range
Key specifications
| Specification | Detail |
|---|---|
| Type | Double row angular contact ball bearing |
| Bearing numbers | 20 (52 and 53 series) |
| Bore d | 15 to 70 mm |
| Outer diameter D | 35 to 150 mm |
| Width B | 15.9 to 63.5 mm |
| Contact angle | 20° (no letter in the bearing number) |
| Cage | Pressed steel |
| Seals / shields | Open (no seals or shields) |
| Basic dynamic load rating Cr | 11.9 to 163 kN |
| Basic static load rating Cor | 7.2 to 132 kN |
| Limiting speed, grease | 3,200 to 14,000 rpm |
| Limiting speed, oil | 4,300 to 19,000 rpm |
| Mass | 0.07 to 4.88 kg |
Available sizes
Show all 20 sizes with load ratings and speeds
| Model | Size d x D x B (mm) | Cr (kN) | Cor (kN) | Limiting speed, grease (rpm) | Limiting speed, oil (rpm) | Mass (kg) |
|---|---|---|---|---|---|---|
| 5202 | 15 x 35 x 15.9 | 11.9 | 7.2 | 14,000 | 19,000 | 0.07 |
| 5203 | 17 x 40 x 17.5 | 15 | 9.25 | 12,000 | 17,000 | 0.09 |
| 5204 | 20 x 47 x 20.6 | 20 | 12.7 | 10,000 | 14,000 | 0.12 |
| 5304 | 20 x 52 x 22.2 | 21.7 | 13.3 | 9,000 | 11,000 | 0.23 |
| 5205 | 25 x 52 x 20.6 | 21.8 | 15.1 | 9,500 | 13,000 | 0.19 |
| 5305 | 25 x 62 x 25.4 | 32 | 21.6 | 7,300 | 10,000 | 0.34 |
| 5306 | 30 x 72 x 30.2 | 41.5 | 29 | 7,000 | 9,500 | 0.51 |
| 5307 | 35 x 80 x 34.9 | 52 | 37 | 6,300 | 8,500 | 0.79 |
| 5208 | 40 x 80 x 30.2 | 45.5 | 34 | 6,000 | 8,000 | 0.57 |
| 5308 | 40 x 90 x 36.5 | 63.5 | 46.5 | 5,500 | 7,500 | 1.05 |
| 5209 | 45 x 85 x 30.2 | 51 | 39 | 5,500 | 7,500 | 0.62 |
| 5309 | 45 x 100 x 39.7 | 76.5 | 56.5 | 5,000 | 6,700 | 1.42 |
| 5210 | 50 x 90 x 30.2 | 54.5 | 44.5 | 5,000 | 6,700 | 0.67 |
| 5211 | 55 x 100 x 33.3 | 67.5 | 56.5 | 4,500 | 6,300 | 0.96 |
| 5311 | 55 x 120 x 49.2 | 112 | 86.5 | 4,000 | 5,500 | 2.3 |
| 5212 | 60 x 110 x 36.5 | 76 | 62 | 4,300 | 5,600 | 1.36 |
| 5312 | 60 x 130 x 54 | 128 | 101 | 3,800 | 5,000 | 3.16 |
| 5213 | 65 x 120 x 38.1 | 89 | 77 | 3,900 | 5,300 | 1.66 |
| 5313 | 65 x 140 x 58.7 | 145 | 115 | 3,600 | 4,700 | 3.86 |
| 5314 | 70 x 150 x 63.5 | 163 | 132 | 3,200 | 4,300 | 4.88 |
Selecting the right option
Single or double row. A double row bearing takes radial, moment and bidirectional axial load in one housing position. A back-to-back pair of single row bearings has more load capacity for the same size, so check the loads against the ratings on this page.
Contact angle. These bearings have a 20° contact angle (no letter in the bearing number). A 30° version (letter A) also exists, but it is not part of this listing.
Open bearings suit housings that provide their own protection and lubrication, and they are the type with both a grease and an oil limiting speed. If you need a bearing that is closed on both sides, see Related products.
Fitting and use
Check the load and speed against the figures in the table before ordering, and apply a suitable safety factor. Limiting speeds apply to lightly loaded bearings that are properly lubricated.
For a 20° double row bearing, the dynamic equivalent radial load is P = Fr + 1.09 Fa when Fa/Fr is 0.57 or less, and P = 0.70 Fr + 1.63 Fa above that. The static equivalent load is Por = Fr + 0.84 Fa.
When fitting, apply force only through the ring that is being pressed on (the inner ring on a shaft, the outer ring in a housing), never through the other ring or the balls.
Related products
Double row bearings with other closures: ZZ shielded, 25 to 70 mm bore (12 sizes), ZZ shielded, 10 to 40 mm bore (6 sizes) and 2NS sealed (8 sizes). For separate single row bearings used in pairs, see 15° flush-ground (28 sizes) and 40° (26 sizes).
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NACHI Double Row Angular Contact Ball Bearings, Open, 15 to 70 mm Bore: 20 x 47 x 20.6mm
SKU: A0105445 | Model: 5204/NACHI
NACHI 5204 double row angular contact ball bearing, open, 20 x 47 x 20.6 mm, Cr 20 kN. Order online from AIMS Industrial.