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 QJ1988 angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11841-iso-qj1988-angular-contact-ball-bearings.jpg)
- ISO QJ1988 angular contact ball bearings
- 6708
- 40x50x6
![ISO 7307 CDB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11839-iso-7307-cdb-angular-contact-ball-bearings.jpg)
- ISO 7307 CDB angular contact ball bearings
- 6800-2RS C3
- 10x19x5
![ISO K16x20x10 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-iso-k16x20x10-needle-roller-bearings.jpg)
- ISO K16x20x10 needle roller bearings
- 55175/55443
- 44.45x112.712x30.162
![950 mm x 1150 mm x 150 mm 950 mm x 1150 mm x 150 mm ISO NUP38/950 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11844-950-mm-x-1150-mm-x-150-mm-950-mm-x-1150-mm-x-150-mm-iso-nup38-950-cylindrical-roller-bearings.jpg)
![100 mm x 165 mm x 52 mm 100 mm x 165 mm x 52 mm ISO 23120W33 spherical roller bearings](https://m.ctrciec.cn/uploaded_images/d11845-100-mm-x-165-mm-x-52-mm-100-mm-x-165-mm-x-52-mm-iso-23120w33-spherical-roller-bearings.jpg)
![ISO KZK20X26X12 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-iso-kzk20x26x12-needle-roller-bearings.jpg)
- ISO KZK20X26X12 needle roller bearings
- 6802-2RU
- 15x24x5
![ISO 3811-2RS angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11842-iso-3811-2rs-angular-contact-ball-bearings.jpg)
- ISO 3811-2RS angular contact ball bearings
- 6800-2RS
- 10x19x5
![ISO Q1068 angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11841-iso-q1068-angular-contact-ball-bearings.jpg)
- ISO Q1068 angular contact ball bearings
- F691XZZ
- 1.5x5x2
![ISO NK15/16 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11837-iso-nk15-16-needle-roller-bearings.jpg)
- ISO NK15/16 needle roller bearings
- 6802ZZ
- 15x24x5
![ISO NK43/20 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11838-iso-nk43-20-needle-roller-bearings.jpg)
- ISO NK43/20 needle roller bearings
- 6324
- 120x260x55
![25 mm x 47 mm x 28 mm 25 mm x 47 mm x 28 mm ISO GE25XDO plain bearings](https://m.ctrciec.cn/uploaded_images/d11844-25-mm-x-47-mm-x-28-mm-25-mm-x-47-mm-x-28-mm-iso-ge25xdo-plain-bearings.jpg)
- 25 mm x 47 mm x 28 mm 25 mm x 47 mm x 28 mm ISO GE25XDO plain bearings
- 6311LLU
- 55x120x29