ISO Bearings
Standard Internal Radial Clearance values for deep groove ball, cylindrical roller, and spherical roller bearings are found in Tables XV through XXII. Please note that there are different standards for metric deep groove ball bearings and inch ball bearings, as well as ISO cylindrical roller bearings and domestic cylindrical roller bearings. Also, the IRC values differ for straight bore bearings versus bearings with a tapered bore. There are no standards for tapered roller bearings. “Clearance” values for these bearings are expressed axially as “lateral” or “Bench End Play” (BEP) and are designed and specified for each application.
A word of caution, regarding IRC for those selecting ISO deep groove ball, cylindrical roller, and spherical roller bearings, is the “Normal” IRC shown in the tables for these bearings is not sufficient for these bearings if the bearing employs a “heavy” shaft fit. A heavy fit in most cases requires a “C3” IRC as a bearing with a “Normal” IRC could be too tight. A light to medium fit with a relatively high operating speed that generates heat also requires a “C3” IRC. If both a heavy fit is used along with a high speed, a “C4” IRC is typically required. Very few bearings with “Normal” IRC are used or stocked, with “C3” bearings being the most popular. For complicated applications, we recommend that users of our bearings contact our sales department for specific fitting and clearance recommendations.
![ISO 71930 A angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11836-iso-71930-a-angular-contact-ball-bearings.jpg)
- ISO 71930 A angular contact ball bearings
- 68/710
- 710x870x74
![220 mm x 300 mm x 80 mm 220 mm x 300 mm x 80 mm ISO NNC4944 V cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11842-220-mm-x-300-mm-x-80-mm-220-mm-x-300-mm-x-80-mm-iso-nnc4944-v-cylindrical-roller-bearings.jpg)
- 220 mm x 300 mm x 80 mm 220 mm x 300 mm x 80 mm ISO NNC4944 V cylindrical roller bearings
- SEA95 /NS 7CE1
- 95x120x13
![ISO NK14/16 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11839-iso-nk14-16-needle-roller-bearings.jpg)
- ISO NK14/16 needle roller bearings
- 6804VV
- 20x32x7
![20 mm x 52 mm x 21 mm 20 mm x 52 mm x 21 mm ISO 2304K+H2304 self aligning ball bearings](https://m.ctrciec.cn/uploaded_images/d11841-20-mm-x-52-mm-x-21-mm-20-mm-x-52-mm-x-21-mm-iso-2304k-h2304-self-aligning-ball-bearings.jpg)
![ISO BK2018 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11845-iso-bk2018-cylindrical-roller-bearings.jpg)
- ISO BK2018 cylindrical roller bearings
- 15000
- 15116
![ISO 7013 BDB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11840-iso-7013-bdb-angular-contact-ball-bearings.jpg)
- ISO 7013 BDB angular contact ball bearings
- 686HZZ
- 6x13x5
![80 mm x 140 mm x 44,45 mm 80 mm x 140 mm x 44,45 mm ISO NUP5216 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11838-80-mm-x-140-mm-x-44-45-mm-80-mm-x-140-mm-x-44-45-mm-iso-nup5216-cylindrical-roller-bearings.jpg)
![180 mm x 380 mm x 75 mm 180 mm x 380 mm x 75 mm ISO NF336 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-180-mm-x-380-mm-x-75-mm-180-mm-x-380-mm-x-75-mm-iso-nf336-cylindrical-roller-bearings.jpg)
- 180 mm x 380 mm x 75 mm 180 mm x 380 mm x 75 mm ISO NF336 cylindrical roller bearings
- NKI 25/20 TN
- 38x25x20
![ISO NKS20 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11837-iso-nks20-needle-roller-bearings.jpg)
- ISO NKS20 needle roller bearings
- 7304B
- 20x52x15