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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
21310 EAKE4 NSK21310EAKE4 d 50 mm Bore diameter D 110 mm Outside diameter B 27 mm Width r (min.) 2 mm Chamfer dimension Cr 178000 N Basic dynamic load rating C0r 174000 N Basic static load rating Thermal Speed Rating (Oil bath) 5300 min 1 Oil bath lubrication subject to conditions outlined in ISO 15312 Mechanical (forced circulation oil) 8000 min 1 Properly designed and controlled forced circulation oil lubrication Grease 4500 min 1 Grease lubrication Oil (Oil bath)
| 21310EAKE4 |
| d | 50 | mm | Bore diameter |
| D | 110 | mm | Outside diameter |
| B | 27 | mm | Width |
| r (min.) | 2 | mm | Chamfer dimension |
| Cr | 178000 | N | Basic dynamic load rating |
| C0r | 174000 | N | Basic static load rating |
| Thermal Speed Rating (Oil-bath) | 5300 | min-1 | Oil-bath lubrication subject to conditions outlined in ISO 15312 |
| Mechanical (forced-circulation oil) | 8000 | min-1 | Properly designed and controlled forced-circulation oil lubrication |
| Grease | 4500 | min-1 | Grease lubrication |
| Oil (Oil-bath) | 5600 | min-1 | Oil-bath lubrication |
| da (min.) | 60 | mm | Diameter of shaft abutment (min) |
| da (max.) | 72 | mm | Diameter of shaft abutment |
| Da (min.) | 98 | mm | Diameter of housing abutment |
| Da (max.) | 100 | mm | Diameter of housing abutment |
| ra (max.) | 2 | mm | Radius of shaft or housing fillet |
| e | 0.23 | Constant | |
| Y2 | 4.4 | Axial load Factors | |
| Y3 | 3 | Axial load Factors | |
| Y0 | 2.9 | Axial load Factors |
| Mass approx. | 1.21 | kg | Mass approx. |
| Adapter | H310X | Adapter | |
| Withdrawal sleeve | AHX310 | Withdrawal sleeve |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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4.4 ★★★★★
Based on 2057 reviews
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Product Reviews
★★★★★ 5
Well-Built, Masculine, Watch and Jewelry Case
Color: Espresso, Color: Espresso
The description here on Amazon is very accurate, but I have to say the quality is beyond what I expected! The material is soft with a nice leather feel to it. And the small details, from the stitching to the hinges to the clasp appears to be very high-quality. It came in a very nice package, and was well protected during shipping. The one thing I really liked about it was that the dividers in some of the compartments are able to be removed, offering a little more versatility as far as storage goes (see pics). The case has a very masculine look to it, which goes with the larger chronographs I have. It also has plenty of space for accessories, such as extra watch bands.
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Reviewed in the United States on October 22, 2025
★★★★★ 5
Procase Men's box
Color: Espresso
Got this for my boyfriend for Christmas. We love it! The latch locks well. Decent size, good quality, might get another one for myself in the future
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Reviewed in the United States on March 30, 2026
★★★★★ 4
Overall recommended for the price
Color: Espresso, Color: Espresso
Pros:
Looks fantastic, just like the pictures
The latch feels solid
Packaging was nice and it arrived undamaged
Price is good for what it is
Cons
Durability of the fake leather on the inside is questionable, I don’t think this is something you’ll be handing down to your kids or anything like that
This thing has a smell that I’ve never smelled before but it is quite unpleasant… hopefully that fades after a bit but it’s really not nice at all out the gate
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Reviewed in the United States on March 19, 2026
★★★★★ 5
Read description and check pics.
Color: Espresso
Box works well, for storage and display. It’s a bit shallow but works for flat storage. No key lock.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Great gift
Color: Black, Color: Black
Minor defects but otherwise perfect! Looks and feels solid, tons of space, and a good price.
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Reviewed in the United States on December 25, 2025