R168ZZ bearing has excellent performance and low noise level. We have it in stock and can provide free sample for testing.
Item No :
R168ZZSize (d*D*B) :
6.35x9.525x3.175mm(1/4x3/8x1/8inch)Lead Time :
3-5 daysWeight :
0.001KGShipping Port :
ChinaMOQ :
100 pcsR168ZZ Inch Sized Miniature Deep Groove Ball Bearing
⚙️Product description:
The inch-sized deep groove ball bearing is a type of rolling bearing. Its size parameters are expressed in imperial units such as inches and fractional inches. In terms of structure, it is similar to the metric deep groove ball bearing, consisting of an inner ring, an outer ring, a group of steel balls and a cage.

| Cage material | Steel, nylon, copper |
| Branding | Famous brand/RMO/Neutral/OEM |
| Sealing | OPEN, ZZ , 2RS |
| Material | Chrome steel (Gcr15) or stainless steel |
| Precision | ABEC-1 ABEC-3 ABEC-5 ABEC-7 |
| Clearance | C0 C3 |
| Vibration | Z1V1, Z2V2, Z3V3 |
| Shipping Port | GUANGZHOU, NINGBO, SHANGHAI |
| Payment | 100% TT, or 30% TT In Advance ,70% TT After Finished Production |
| Service | Some models free sample can be provided |
Simple structure: It mainly consists of the inner ring, outer ring, steel balls and cage. This simple structure makes its manufacturing process relatively simple, with lower costs, and also facilitates installation and disassembly, making maintenance easier.
Low friction coefficient: The rolling elements and raceways have point contact, resulting in low friction resistance, which can effectively reduce energy loss and improve the transmission efficiency of the equipment. It can also maintain low heat generation during high-speed rotation.
High limit speed: Due to low friction and smooth operation, imperial deep groove ball bearings can work at higher rotational speeds and are suitable for equipment that requires high-speed operation, such as high-speed motors and machine tool spindles.
The inch-sized deep groove ball bearings come in various series and models. Common series include R series, 16 series, RLS series, RMS series, etc. Within each series, there are different size specifications to meet various application scenarios and installation requirements. The model usually contains key dimension information such as the inner diameter, outer diameter, width of the bearing, as well as characteristic codes for sealing type and precision grade.
There are various sealing forms such as open type and closed type. Open type bearings do not have any sealing covers and are suitable for clean and dry working environments; closed type bearings have sealing covers on both sides, for example, "ZZ" indicates that both sides have metal covers, which can prevent dust, impurities, etc. from entering the bearing interior and extend the service life of the bearing.

| Model No. | d | D | H | m |
| R155 | 3.97 mm | 7.94 mm | 2.78 mm | 0.55 g |
| R155ZZ | 3.97 mm | 7.94 mm | 3.18 mm | 0.55 g |
| R156 | 4.76 mm | 7.94 mm | 2.78 mm | 0.45 g |
| R156ZZ | 4.76 mm | 7.94 mm | 3.18 mm | 0.45 g |
| R166 | 4.76 mm | 9.52 mm | 3.18 mm | 0.8 g |
| R3ZZ | 4.76 mm | 12.7 mm | 4.98 mm | 2.27 g |
| R3 | 4.76 mm | 12.7 mm | 3.97 mm | 2.27 g |
| R186 | 4.76 mm | 12.7 mm | 2.78 mm | 2 g |
| R186ZZ | 4.76 mm | 12.7 mm | 3.97 mm | 2 g |
| R3A | 4.76 mm | 15.88 mm | 4.98 mm | 4.75 g |
| R3AZZ | 4.76 mm | 15.88 mm | 4.98 mm | 5.08 g |
| R168ZZ | 6.35 mm | 9.52 mm | 3.18 mm | 0.6 g |
| R188 | 6.35 mm | 12.7 mm | 3.18 mm | 2 g |
Automobile industry, machine tool sector, motor industry, agricultural machinery, textile machinery, food and beverage industry, etc.
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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