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 K14X19X10 needle roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
ISO 7201 ADB angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
800 mm x 1150 mm x 155 mm ISO NUP10/800 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
596,9 mm x 685,8 mm x 31,75 mm ISO 680235/680270 tapered roller bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
ISO 3304 angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
100 mm x 145 mm x 22,5 mm ISO JP10049/10 tapered roller bearings	Normal Duty	Setscrew Ball Bearing	208 Series	Ductile Iron
85 mm x 180 mm x 41 mm ISO 6317 deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	211 Series	Cast Iron
560 mm x 1030 mm x 365 mm ISO 232/560 KCW33+AH32/560 spherical roller bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
35 mm x 92 mm x 49,2 mm ISO UCFCX07 bearing units	Normal Duty	Setscrew Ball Bearing	210 Series	Cast Iron
55 mm x 72 mm x 9 mm ISO 61811 ZZ deep groove ball bearings	Medium Duty	Setscrew Ball Bearing	211 Series	Cast Iron
400 mm x 600 mm x 148 mm ISO NJ3080 cylindrical roller bearings	307 Series	Expansion	2 Bolt Pillow Block	Grease Seal (Taper)
ISO BK1512 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron