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 K65x70x20 needle roller bearings	Normal Duty	Setscrew Ball Bearing	210 Series	Cast Iron
340 mm x 620 mm x 165 mm ISO NUP2268 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
5 mm x 11 mm x 3 mm ISO FL618/5 deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
3,175 mm x 7,938 mm x 2,779 mm ISO R2-5 deep groove ball bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Cast Iron
120 mm x 215 mm x 76 mm ISO 23224 KCW33+AH3224 spherical roller bearings	Intermediate Duty	Setscrew Ball Bearing	204 Series	Cast Iron
160 mm x 240 mm x 145 mm ISO NNU6032 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
320 mm x 580 mm x 92 mm ISO NU264 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
60 mm x 95 mm x 18 mm ISO NU1012 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	214 Series	Cast Iron
41,275 mm x 76,2 mm x 17,384 mm ISO 11162/11300 tapered roller bearings	Intermediate Duty	Setscrew Ball Bearing	207 Series	Zinc
25 mm x 62 mm x 25,4 mm ISO 63305 ZZ deep groove ball bearings	Intermediate Duty	Setscrew Ball Bearing	209 Series	Cast Iron
ISO K48x54x19 needle roller bearings	Normal Duty	Grip Tight Ball Bearing	207 Series	Stainless Steel
130 mm x 280 mm x 93 mm ISO NUP2326 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	211 Series	Cast Iron