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.

Bearing Number	Bore Dia	Outer DIa	Width	Size
ISO 89312 thrust roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron
ISO 7200 CDT angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
300 mm x 500 mm x 200 mm ISO 24160 K30W33 spherical roller bearings	Normal Duty	Setscrew Ball Bearing	204 Series	Cast Iron
170 mm x 360 mm x 72 mm ISO 7334 B angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
ISO HK4516 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	204 Series	Cast Iron
30 mm x 90 mm x 23 mm ISO 7406 A angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	211 Series	Cast Iron
530 mm x 980 mm x 355 mm ISO 232/530W33 spherical roller bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Cast Iron
ISO UKT215 bearing units	Intermediate Duty	Eccentric Collar Ball Bearing	203 Series	Zinc
110 mm x 170 mm x 28 mm ISO 7022 C angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
30 mm x 72 mm x 19 mm ISO 1306 self aligning ball bearings	Normal Duty	Setscrew Ball Bearing	203 Series	Zinc
36 mm x 72,05 mm x 34 mm ISO DAC36720534 angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	210 Series	Cast Iron
16 mm x 19,3 mm x 21 mm ISO SIL 16 plain bearings	Normal Duty	D-Lock Ball Bearing	211 Series	Cast Iron