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 7234 CDF angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11840-iso-7234-cdf-angular-contact-ball-bearings.jpg)
- ISO 7234 CDF angular contact ball bearings
- 68/800
- 800x980x82
![63,5 mm x 110 mm x 21,996 mm 63,5 mm x 110 mm x 21,996 mm ISO 390A/394AS tapered roller bearings](https://m.ctrciec.cn/uploaded_images/d11839-63-5-mm-x-110-mm-x-21-996-mm-63-5-mm-x-110-mm-x-21-996-mm-iso-390a-394as-tapered-roller-bearings.jpg)
![630 mm x 920 mm x 170 mm 630 mm x 920 mm x 170 mm ISO NU20/630 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11836-630-mm-x-920-mm-x-170-mm-630-mm-x-920-mm-x-170-mm-iso-nu20-630-cylindrical-roller-bearings.jpg)
![160 mm x 340 mm x 68 mm 160 mm x 340 mm x 68 mm ISO 7332 A angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11844-160-mm-x-340-mm-x-68-mm-160-mm-x-340-mm-x-68-mm-iso-7332-a-angular-contact-ball-bearings.jpg)
![ISO 3215 ZZ angular contact ball bearings](https://m.ctrciec.cn/uploaded_images/d11839-iso-3215-zz-angular-contact-ball-bearings.jpg)
- ISO 3215 ZZ angular contact ball bearings
- 6801LLB
- 12x21x5
![100 mm x 140 mm x 24 mm 100 mm x 140 mm x 24 mm ISO NCF2920 V cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11843-100-mm-x-140-mm-x-24-mm-100-mm-x-140-mm-x-24-mm-iso-ncf2920-v-cylindrical-roller-bearings.jpg)
![130 mm x 340 mm x 78 mm 130 mm x 340 mm x 78 mm ISO NF426 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11841-130-mm-x-340-mm-x-78-mm-130-mm-x-340-mm-x-78-mm-iso-nf426-cylindrical-roller-bearings.jpg)
![ISO RPNA28/44 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11845-iso-rpna28-44-needle-roller-bearings.jpg)
- ISO RPNA28/44 needle roller bearings
- 68/800
- 800x980x82
![710 mm x 950 mm x 140 mm 710 mm x 950 mm x 140 mm ISO NF29/710 cylindrical roller bearings](https://m.ctrciec.cn/uploaded_images/d11842-710-mm-x-950-mm-x-140-mm-710-mm-x-950-mm-x-140-mm-iso-nf29-710-cylindrical-roller-bearings.jpg)
![150 mm x 210 mm x 60 mm 150 mm x 210 mm x 60 mm ISO NNU4930 cylindrical 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-nnu4930-cylindrical-roller-bearings.jpg)
![ISO K42x50x18 needle roller bearings](https://m.ctrciec.cn/uploaded_images/d11837-iso-k42x50x18-needle-roller-bearings.jpg)
- ISO K42x50x18 needle roller bearings
- 6805NSE
- 25x37x7