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Ships within 48 hours · Estimated delivery Jul 24 - Jul 29
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Description
NU311 EW NSKN311W d 55 mm Bore diameter D 120 mm Outside diameter B 29 mm Width EW 104. 5 mm Raceway diameter of outer ring r (min.) 2 mm Chamfer dimension r1 (min.) 2 mm Chamfer dimension Cr 136000 N Basic dynamic load rating C0r 111000 N Basic static load rating Thermal Speed Rating (Oil bath) 6300 min 1 Oil bath lubrication subject to conditions outlined in ISO 15312 Grease 4000 min 1 Grease lubrication Oil (Oil bath) 5000 min 1 Oil bath lubrication da (min.)
| N311W |
| d | 55 | mm | Bore diameter |
| D | 120 | mm | Outside diameter |
| B | 29 | mm | Width |
| EW | 104.5 | mm | Raceway diameter of outer ring |
| r (min.) | 2 | mm | Chamfer dimension |
| r1 (min.) | 2 | mm | Chamfer dimension |
| Cr | 136000 | N | Basic dynamic load rating |
| C0r | 111000 | N | Basic static load rating |
| Thermal Speed Rating (Oil-bath) | 6300 | min-1 | Oil-bath lubrication subject to conditions outlined in ISO 15312 |
| Grease | 4000 | min-1 | Grease lubrication |
| Oil (Oil-bath) | 5000 | min-1 | Oil-bath lubrication |
| da (min.) | 64 | mm | Diameter of shaft abutment (min) |
| Db (min.) | 107 | mm | Diameter of housing abutment |
| rb (max.) | 2 | mm | Radius of shaft or housing fillet |
| Db (max.) | 111 | mm | Diameter of housing abutment |
| ra (max.) | 2 | mm | Radius of shaft or housing fillet |
| Mass approx. | 1.42 | kg | Mass approx. |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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- Final sale items are not eligible for returns or exchanges.
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4.3 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 2
It doesn’t do what is supposed to do
Color: Blue
Wasn’t impressed..,all the ball does is vibrate. It doesn’t really bounce
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Reviewed in the United States on March 6, 2026
★★★★★ 5
My dogs fight over it
Color: Orange, Color: Orange
Easy to use, durable, and has a great battery love. At first my dogs were curious and unsure about it, now its become one of their favorite toys. They'll stare at it while its being charged and impatiently wait for it so they can have fun again. Perfect size for most breeds.
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Reviewed in the United States on January 3, 2026
★★★★★ 5
Bouncy, not hard, and good value.
Style: Fetch Balls (Pack of 10), Size: 2.5 inch
Great balls for the ball launcher and not rockhard like some of the solid rubber balls. These have great bounce, and because of the two holes, they make a fun whistling noise as they fly through the air. My dogs love them and they are a good value.
By the way, if you throw them too hard, they will go through chain-link and no climb fence because they squish a bit!
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Reviewed in the United States on February 16, 2026
★★★★★ 5
Excellent dog balls — safe design and very durable
Style: Fetch Balls (Pack of 3), Size: 2.5 inch
These fetch balls from Amazon Basics are fantastic, and my dog absolutely loves them. One of the biggest reasons I prefer these over other brands is the hole that runs through the center of the ball. This is a very important safety feature: if a dog were to accidentally get the ball stuck in the back of the throat, the hole allows air to pass through. That small detail could literally make a life-saving difference.
Aside from the safety benefit, they bounce well, are easy to clean, and hold up to a lot of playtime. They’re firm but not rock-hard, and my dog goes crazy for them. Great value, great quality, and a thoughtful design.
Highly recommended for dog owners who want a safer alternative to standard solid rubber balls.
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Reviewed in the United States on December 1, 2025
★★★★★ 5
Great ball for heavy chewers
Style: Assorted Balls (Pack of 3), Size: 2.5 inch
Great toy for my Doberman. She chews through tennis balls in about 15 minutes but these are very durable. She likes to chase them but also just chew on them.
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Reviewed in the United States on April 26, 2026