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.
![220 mm x 340 mm x 90 mm 220 mm x 340 mm x 90 mm ISO NCF3044 V cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11845-220-mm-x-340-mm-x-90-mm-220-mm-x-340-mm-x-90-mm-iso-ncf3044-v-cylindrical-roller-bearings.jpg)
![260 mm x 400 mm x 104 mm 260 mm x 400 mm x 104 mm ISO 23052 KCW33+AH3052 spherical roller bearings](https://m.ctrciec.cn/uploaded_images/d11842-260-mm-x-400-mm-x-104-mm-260-mm-x-400-mm-x-104-mm-iso-23052-kcw33-ah3052-spherical-roller-bearings.jpg)
![70 mm x 125 mm x 31 mm 70 mm x 125 mm x 31 mm ISO 2214K self aligning ball bearings](https://m.ctrciec.cn/uploaded_images/d11836-70-mm-x-125-mm-x-31-mm-70-mm-x-125-mm-x-31-mm-iso-2214k-self-aligning-ball-bearings.jpg)
![ISO BK172520 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11840-iso-bk172520-cylindrical-roller-bearings.jpg)
- ISO BK172520 cylindrical roller bearings
- 6804ZZ/42
- 20x42x7
![850 mm x 1120 mm x 200 mm 850 mm x 1120 mm x 200 mm ISO 239/850W33 spherical roller bearings](https://m.ctrciec.cn/uploaded_images/d11844-850-mm-x-1120-mm-x-200-mm-850-mm-x-1120-mm-x-200-mm-iso-239-850w33-spherical-roller-bearings.jpg)
![ISO 71901 CDB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11841-iso-71901-cdb-angular-contact-ball-bearings.jpg)
- ISO 71901 CDB angular contact ball bearings
- FYNT 50 F
- 50x70x15
![140 mm x 210 mm x 125 mm 140 mm x 210 mm x 125 mm ISO NNU6028 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-140-mm-x-210-mm-x-125-mm-140-mm-x-210-mm-x-125-mm-iso-nnu6028-cylindrical-roller-bearings.jpg)
![ISO 7203 ADB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11837-iso-7203-adb-angular-contact-ball-bearings.jpg)
- ISO 7203 ADB angular contact ball bearings
- 6313ZZ
- 65x140x33
![55 mm x 100 mm x 33,3 mm 55 mm x 100 mm x 33,3 mm ISO NJ3211 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11838-55-mm-x-100-mm-x-33-3-mm-55-mm-x-100-mm-x-33-3-mm-iso-nj3211-cylindrical-roller-bearings.jpg)
![ISO 53406U+U406 thrust ball bearings](https://m.ctrciec.cn/uploaded_images/d11845-iso-53406u-u406-thrust-ball-bearings.jpg)
- ISO 53406U+U406 thrust ball bearings
- L 17
- 17x40x10
![140 mm x 250 mm x 42 mm 140 mm x 250 mm x 42 mm ISO NJ228 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11836-140-mm-x-250-mm-x-42-mm-140-mm-x-250-mm-x-42-mm-iso-nj228-cylindrical-roller-bearings.jpg)