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
62,738 mm x 101,6 mm x 25,4 mm ISO 28995/28920 tapered roller bearings	Normal Duty	Grip Tight Ball Bearing	212 Series	Cast Iron
50 mm x 90 mm x 20 mm ISO 20210 KC+H210 spherical roller bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Zinc
292,1 mm x 393,7 mm x 50,8 mm ISO 84115/84155 tapered roller bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Zinc
65 mm x 100 mm x 18 mm ISO NUP1013 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
180 mm x 380 mm x 126 mm ISO N2336 cylindrical roller bearings	111 Series	Expansion	2 Bolt Pillow Block	Grease Seal (Taper)
30 mm x 55 mm x 13 mm ISO 7006 A angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	208 Series	Cast Iron
380 mm x 560 mm x 82 mm ISO 7076 A angular contact ball bearings	Intermediate Duty	Setscrew Ball Bearing	205 Series	Zinc
1320 mm x 1600 mm x 122 mm ISO NU18/1320 cylindrical roller bearings	Normal Duty	Setscrew Ball Bearing	203 Series	Zinc
16,993 mm x 47 mm x 14,381 mm ISO 05066/05185 tapered roller bearings	Normal Duty	Setscrew Ball Bearing	206 Series	Cast Iron
3 mm x 6 mm x 2 mm ISO MF63 deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	204 Series	Cast Iron
ISO 234426 thrust ball bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
240 mm x 340 mm x 140 mm ISO GE 240 ES-2RS plain bearings	Normal Duty	Eccentric Collar Ball Bearing	205 Series	Cast Iron