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
170 mm x 280 mm x 88 mm ISO 23134 KCW33+H3134 spherical roller bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
85 mm x 150 mm x 28 mm ISO 20217 KC+H217 spherical roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron
15 mm x 24 mm x 5 mm ISO 61802 ZZ deep groove ball bearings	Intermediate Duty	Setscrew Ball Bearing	207 Series	Zinc
160 mm x 290 mm x 80 mm ISO 22232 KW33 spherical roller bearings	Normal Duty	Setscrew Ball Bearing	203 Series	Zinc
ISO 3303 angular contact ball bearings	Normal Duty	Grip Tight Ball Bearing	207 Series	Cast Iron
530 mm x 780 mm x 185 mm ISO 230/530 KCW33+AH30/530 spherical roller bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Zinc
240 mm x 500 mm x 95 mm ISO NH348 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
6 mm x 15 mm x 5 mm ISO F696-2RS deep groove ball bearings	WIDE SLOT	15.0000 in	2 X 2 X 3/16	502
20 mm x 55 mm x 14,3 mm ISO GE20AW plain bearings	Intermediate Duty	Setscrew Ball Bearing	204 Series	Zinc
100 mm x 215 mm x 47 mm ISO 7320 C angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	208 Series	Cast Iron
ISO 7236 CDB angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
100 mm x 180 mm x 46 mm ISO NF2220 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron