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
70 mm x 100 mm x 16 mm ISO 61914 deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
39,688 mm x 76,2 mm x 25,654 mm ISO 2789/2720 tapered roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron
3 mm x 10 mm x 4 mm ISO F623ZZ deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	208 Series	Cast Iron
180 mm x 300 mm x 118 mm ISO 24136W33 spherical roller bearings	Normal Duty	Crossville, TN - DC	0.07 LB	782475957897
12 mm x 15,4 mm x 16 mm ISO SAL 12 plain bearings	Intermediate Duty	Eccentric Collar Ball Bearing	206 Series	Zinc
630 mm x 1150 mm x 230 mm ISO NUP12/630 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
1,984 mm x 6,35 mm x 3,571 mm ISO FR1-4ZZ deep groove ball bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
420 mm x 560 mm x 65 mm ISO NUP1984 cylindrical roller bearings	Intermediate Duty	Setscrew Ball Bearing	204 Series	Zinc
140 mm x 300 mm x 102 mm ISO NUP2328 cylindrical roller bearings	Normal Duty	Eccentric Collar Ball Bearing	207 Series	Cast Iron
ISO 52412 thrust ball bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron
ISO 81122 thrust roller bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
1320 mm x 1600 mm x 122 mm ISO NUP18/1320 cylindrical roller bearings	Normal Duty	D-Lock Ball Bearing	210 Series	Cast Iron