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.
- 200 mm x 360 mm x 98 mm ISO 22240 KCW33+AH2240 spherical roller bearings
- Intermediate Duty
- Setscrew Ball Bearing
- 200 mm x 320 mm x 165 mm ISO GE 200 HS-2RS plain bearings
- Normal Duty
- Eccentric Collar Ball Bearing
- 320 mm x 400 mm x 38 mm ISO NCF1864 V cylindrical roller bearings
- Normal Duty
- Setscrew Ball Bearing
- 360 mm x 600 mm x 192 mm ISO NN3172 cylindrical roller bearings
- Intermediate Duty
- Setscrew Ball Bearing
- ISO 7407 ADF angular contact ball bearings
- Normal Duty
- Eccentric Collar Ball Bearing
- ISO 29440 M thrust roller bearings
- Normal Duty
- Setscrew Ball Bearing
- ISO 7306 ADT angular contact ball bearings
- Normal Duty
- Setscrew Ball Bearing
- 95 mm x 200 mm x 77,8 mm ISO NJ3319 cylindrical roller bearings
- 203 Series
- Non-Expansion
- 5 mm x 11 mm x 4 mm ISO 628/5 ZZ deep groove ball bearings
- Intermediate Duty
- Eccentric Collar Ball Bearing
- ISO 7222 ADT angular contact ball bearings
- Normal Duty
- Grip Tight Ball Bearing
- ISO 3303 ZZ angular contact ball bearings
- 207 Series
- Expansion
- ISO Q224 angular contact ball bearings
- Intermediate Duty
- Setscrew Ball Bearing