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 3804-2RS angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	212 Series	Cast Iron
380 mm x 480 mm x 75 mm ISO N3876 cylindrical roller bearings	Medium Duty	Setscrew Ball Bearing	206 Series	Cast Iron
30 mm x 72 mm x 30,2 mm ISO 63306-2RS deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	204 Series	Cast Iron
90 mm x 160 mm x 30 mm ISO NF218 cylindrical roller bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
160 mm x 270 mm x 86 mm ISO NJ3132 cylindrical roller bearings	Medium Duty	Crossville, TN - DC	0.1 LB	782475285570
190 mm x 320 mm x 104 mm ISO NN3138 cylindrical roller bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
5 mm x 14 mm x 5 mm ISO F605ZZ deep groove ball bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Zinc
1180 mm x 1540 mm x 206 mm ISO NUP29/1180 cylindrical roller bearings	Intermediate Duty	Eccentric Collar Ball Bearing	204 Series	Cast Iron
60 mm x 150 mm x 35 mm ISO NJ412 cylindrical roller bearings	Normal Duty	Eccentric Collar Ball Bearing	209 Series	Cast Iron
ISO 7206 BDF angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
500 mm x 620 mm x 90 mm ISO NJ38/500 cylindrical roller bearings	Intermediate Duty	Setscrew Ball Bearing	204 Series	Zinc
ISO 7004 CDF angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	210 Series	Cast Iron