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 234411 thrust ball bearings	Medium Duty	Setscrew Ball Bearing	211 Series	Cast Iron
ISO 53309 thrust ball bearings	Normal Duty	Grip Tight Ball Bearing	209 Series	Cast Iron
280 mm x 500 mm x 130 mm ISO 22256W33 spherical roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron
ISO 52411 thrust ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
70 mm x 90 mm x 10 mm ISO 61814 ZZ deep groove ball bearings	Normal Duty	Setscrew Ball Bearing	207 Series	Cast Iron
ISO KZK30X37X16 needle roller bearings	Intermediate Duty	Eccentric Collar Ball Bearing	207 Series	Cast Iron
ISO K14X20X17 needle roller bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
1000 mm x 1220 mm x 128 mm ISO NF28/1000 cylindrical roller bearings	Normal Duty	Grip Tight Ball Bearing	216 Series	Cast Iron
85,725 mm x 142,138 mm x 42,862 mm ISO HM617049/10 tapered roller bearings	Intermediate Duty	Setscrew Ball Bearing	206 Series	Zinc
ISO 7217 ADB angular contact ball bearings	Normal Duty	Setscrew Ball Bearing	209 Series	Cast Iron
180 mm x 320 mm x 112 mm ISO NJ3236 cylindrical roller bearings	Normal Duty	D-Lock Ball Bearing	204 Series	Cast Iron
44,45 mm x 95,25 mm x 28,575 mm ISO 33885/33822 tapered roller bearings	Normal Duty	Setscrew Ball Bearing	205 Series	Cast Iron