ISO Bearings
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.
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.
- ISO HK1214 cylindrical roller bearings
- Medium Duty
- Setscrew Ball Bearing
- 30 mm x 62 mm x 20 mm ISO NCF2206 V cylindrical roller bearings
- Intermediate Duty
- Setscrew Ball Bearing
- 170 mm x 230 mm x 38 mm ISO 32934 tapered roller bearings
- Normal Duty
- Setscrew Ball Bearing
- 20 mm x 47 mm x 14 mm ISO 30204 tapered roller bearings
- Normal Duty
- Grip Tight Ball Bearing
- 850 mm x 1360 mm x 400 mm ISO 231/850W33 spherical roller bearings
- Normal Duty
- Setscrew Ball Bearing
- ISO RNA5928 needle roller bearings
- Intermediate Duty
- Setscrew Ball Bearing
- ISO HK1618 cylindrical roller bearings
- Normal Duty
- D-Lock Ball Bearing
- 1,397 mm x 4,762 mm x 2,779 mm ISO R1ZZ deep groove ball bearings
- Intermediate Duty
- Setscrew Ball Bearing
- ISO 7032 BDB angular contact ball bearings
- Normal Duty
- Setscrew Ball Bearing
- ISO K18x25x22 needle roller bearings
- Intermediate Duty
- Eccentric Collar Ball Bearing
- ISO 71824 C angular contact ball bearings
- Medium Duty
- Setscrew Ball Bearing
- 340 mm x 580 mm x 243 mm ISO 24168 K30CW33+AH24168 spherical roller bearings
- Intermediate Duty
- Setscrew Ball Bearing