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 K26x30x17 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-iso-k26x30x17-needle-roller-bearings.jpg)
- ISO K26x30x17 needle roller bearings
- NN4930HSC3NAP5
- 150x210x60
![ISO 7417 ADB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11838-iso-7417-adb-angular-contact-ball-bearings.jpg)
- ISO 7417 ADB angular contact ball bearings
- 68/850
- 850x1030x82
![ISO 7322 ADF angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11845-iso-7322-adf-angular-contact-ball-bearings.jpg)
- ISO 7322 ADF angular contact ball bearings
- 24156R
- 280x460x180
![260 mm x 480 mm x 130 mm 260 mm x 480 mm x 130 mm ISO NF2252 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11839-260-mm-x-480-mm-x-130-mm-260-mm-x-480-mm-x-130-mm-iso-nf2252-cylindrical-roller-bearings.jpg)
![130 mm x 230 mm x 80 mm 130 mm x 230 mm x 80 mm ISO NUP3226 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11836-130-mm-x-230-mm-x-80-mm-130-mm-x-230-mm-x-80-mm-iso-nup3226-cylindrical-roller-bearings.jpg)
![159 mm x 300 mm x 84 mm 159 mm x 300 mm x 84 mm ISO NJ159X300X84 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11844-159-mm-x-300-mm-x-84-mm-159-mm-x-300-mm-x-84-mm-iso-nj159x300x84-cylindrical-roller-bearings.jpg)
![ISO 294/800 M thrust roller bearings](https://m.ctrciec.cn/uploaded_images/d11841-iso-294-800-m-thrust-roller-bearings.jpg)
- ISO 294/800 M thrust roller bearings
- 6410
- 50x130x31
![900 mm x 1280 mm x 280 mm 900 mm x 1280 mm x 280 mm ISO 230/900 KCW33+H30/900 spherical roller bearings](https://m.ctrciec.cn/uploaded_images/d11844-900-mm-x-1280-mm-x-280-mm-900-mm-x-1280-mm-x-280-mm-iso-230-900-kcw33-h30-900-spherical-roller-bearings.jpg)
![17 mm x 35 mm x 14 mm 17 mm x 35 mm x 14 mm ISO 63003-2RS deep groove ball bearings](https://m.ctrciec.cn/uploaded_images/d11839-17-mm-x-35-mm-x-14-mm-17-mm-x-35-mm-x-14-mm-iso-63003-2rs-deep-groove-ball-bearings.jpg)
![400 mm x 500 mm x 75 mm 400 mm x 500 mm x 75 mm ISO NU3880 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11838-400-mm-x-500-mm-x-75-mm-400-mm-x-500-mm-x-75-mm-iso-nu3880-cylindrical-roller-bearings.jpg)
- 400 mm x 500 mm x 75 mm 400 mm x 500 mm x 75 mm ISO NU3880 cylindrical roller bearings
- EE113091/113170
- 228.46x431.8x92.075