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 K08x11x13 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11837-iso-k08x11x13-needle-roller-bearings.jpg)
- ISO K08x11x13 needle roller bearings
- 68/950
- 950x1150x90
![500 mm x 720 mm x 167 mm 500 mm x 720 mm x 167 mm ISO 230/500 KW33 spherical roller bearings](https://m.ctrciec.cn/uploaded_images/d11845-500-mm-x-720-mm-x-167-mm-500-mm-x-720-mm-x-167-mm-iso-230-500-kw33-spherical-roller-bearings.jpg)
- 500 mm x 720 mm x 167 mm 500 mm x 720 mm x 167 mm ISO 230/500 KW33 spherical roller bearings
- 68/850/1080
- 850x1080x82
![ISO 71928 CDB angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11842-iso-71928-cdb-angular-contact-ball-bearings.jpg)
- ISO 71928 CDB angular contact ball bearings
- 68/670
- 670x820x69
![150 mm x 210 mm x 60 mm 150 mm x 210 mm x 60 mm ISO NA4930 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11838-150-mm-x-210-mm-x-60-mm-150-mm-x-210-mm-x-60-mm-iso-na4930-needle-roller-bearings.jpg)
![ISO 53272U+U272 thrust ball bearings](https://m.ctrciec.cn/uploaded_images/d11844-iso-53272u-u272-thrust-ball-bearings.jpg)
- ISO 53272U+U272 thrust ball bearings
- 6917
- 85x120x18
![40 mm x 65 mm x 32 mm 40 mm x 65 mm x 32 mm ISO GE40/65XDO-2RS plain bearings](https://m.ctrciec.cn/uploaded_images/d11841-40-mm-x-65-mm-x-32-mm-40-mm-x-65-mm-x-32-mm-iso-ge40-65xdo-2rs-plain-bearings.jpg)
- 40 mm x 65 mm x 32 mm 40 mm x 65 mm x 32 mm ISO GE40/65XDO-2RS plain bearings
- 4T-25577/25522
- 42.875x83.058x25.4
![ISO K04x07x07 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11842-iso-k04x07x07-needle-roller-bearings.jpg)
- ISO K04x07x07 needle roller bearings
- MFJ-69
- 6x10x9
![75 mm x 190 mm x 45 mm 75 mm x 190 mm x 45 mm ISO N415 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11840-75-mm-x-190-mm-x-45-mm-75-mm-x-190-mm-x-45-mm-iso-n415-cylindrical-roller-bearings.jpg)