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Description
nj204 et nskNJ204ET d 20 mm Bore diameter D 47 mm Outside diameter B 14 mm Width FW 26. 5 mm Raceway diameter of inner ring r (min.) 1 mm Chamfer dimension r1 (min.) 0. 6 mm Chamfer dimension Cr 31500 N Basic dynamic load rating C0r 22600 N Basic static load rating Thermal Speed Rating (Oil bath) 16000 min 1 Oil bath lubrication subject to conditions outlined in ISO 15312 Mechanical (forced circulation oil) 19000 min 1 Properly designed and controlled forced
| NJ204ET |
| d | 20 | mm | Bore diameter |
| D | 47 | mm | Outside diameter |
| B | 14 | mm | Width |
| FW | 26.5 | mm | Raceway diameter of inner ring |
| r (min.) | 1 | mm | Chamfer dimension |
| r1 (min.) | 0.6 | mm | Chamfer dimension |
| Cr | 31500 | N | Basic dynamic load rating |
| C0r | 22600 | N | Basic static load rating |
| Thermal Speed Rating (Oil-bath) | 16000 | min-1 | Oil-bath lubrication subject to conditions outlined in ISO 15312 |
| Mechanical (forced-circulation oil) | 19000 | min-1 | Properly designed and controlled forced-circulation oil lubrication |
| Grease | 13000 | min-1 | Grease lubrication |
| Oil (Oil-bath) | 16000 | min-1 | Oil-bath lubrication |
| da (min.) | 25 | mm | Diameter of shaft abutment (min) |
| db (min.) | 24 | mm | Diameter of shaft / spacer sleeve abutment |
| db (max.) | 25 | mm | Diameter of shaft / spacer sleeve abutment |
| dc (min.) | 29 | mm | Diameter of shaft abutment |
| dd (min.) | 32 | mm | Diameter of shaft abutment |
| Da (max.) | 42 | mm | Diameter of housing abutment |
| rb (max.) | 0.6 | mm | Radius of shaft or housing fillet |
| ra (max.) | 1 | mm | Radius of shaft or housing fillet |
| Mass approx. | 0.112 | kg | Mass approx. |
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4.5 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Great sturdy chair and beautiful color
Color: White
I love this chair. I bought it for my home office. It is beautiful, sturdy and very comfortable. I'm not good at all with assembling even basic things but I would say that this was relatively pretty simple for someone like me to put together. Good price and good product.
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Reviewed in the United States on April 3, 2026
★★★★★ 4
Reliable, Comfortable, and Good-Looking Chair — I Keep Coming Back to It
Color: White
This is my fourth time purchasing this Amazon Basics mid-back office chair, which says a lot about its overall value. It looks clean and modern, fits well in a home office, and is genuinely comfortable for daily use. I typically get about a year and a half out of each one, which feels reasonable given the price point and materials.
Out of the box, the chair is easy to assemble and immediately comfortable. The padding is supportive, the armrests are well positioned, and the faux leather gives it a more upscale appearance than many chairs in this category. It rolls smoothly, swivels easily, and works well for long computer sessions without causing back or shoulder fatigue.
That said, this is not a lifetime chair. After extended use, the cushioning and structure do begin to wear, and that’s usually when I replace it. Still, considering the comfort, appearance, and cost, it remains one of the best value office chairs I’ve found — which is why I keep buying it again.
Pros:
• Comfortable padding and good mid-back support
• Clean, modern appearance that looks great in an office
• Smooth rolling and stable base
• Easy assembly
• Excellent value for the price
Cons:
• Durability is moderate; expect replacement after about 1½ years
• Not designed for long-term heavy-duty use
Verdict:
If you want a comfortable, attractive, and affordable office chair that performs well for daily use, this is a strong choice. It may not last forever, but its comfort and value make it easy to recommend — and easy to repurchase.
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Highly recommend
Color: Black
Very sturdy, the cushions make it super comfortable. The size and ease of movement are perfect. Assembly was super easy. A very quiet chair. Wonderful all around value.
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Reviewed in the United States on February 28, 2026
★★★★★ 5
Great price.
Color: Black
Easily put together. Very comfortable and cushioned. Rolls easily on the glass mat at my desk. Highly recommend for the price.
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Reviewed in the United States on April 13, 2026
★★★★★ 3
Good Basic Chair with a Few Drawbacks
Color: Black
I bought this Amazon Basics office task chair for my boyfriend who works from home. Overall, it’s a decent, simple chair that gets the job done for everyday use, especially if you just need something functional and affordable.
However, there are a couple of downsides. The recline doesn’t go back as much as he would like, so it’s not ideal if you prefer to lean back and relax between tasks. Also, after about a month of use, the wheels don’t glide as smoothly as they did at first, which can be a bit frustrating when rolling across the floor.
Overall, it’s a solid basic chair for light use, but if you want something with a deeper recline or super smooth mobility long-term, you might want to consider other options. Still a reasonable purchase depending on your needs.
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Reviewed in the United States on February 12, 2026