ISO Bearings

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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.

Toyana NJ2952 cylindrical roller bearings

+10 to +22 SAE 841
MIL-B-5687C Type I C Bronze

Toyana 7314 A-UX angular contact ball bearings

Steel 1.8125 in
3.5000 in Complete Assembly D2

Toyana K42x47x27 needle roller bearings

5000 5 in
Four-Bolt Base 13.0000 in

Toyana UCFL208 bearing units

30,5 mm 1,5 mm
20 32 mm

Toyana NJ10/800 cylindrical roller bearings

Standard Steel
Cylindrical Bore 37

Toyana NNCL4838 V cylindrical roller bearings

31328-DF 4 mm
0,83 NKE

Toyana 6024 ZZ deep groove ball bearings

Concentric Collar 3461 lb

Toyana L433749/10 tapered roller bearings

1.1250 in Two-Bolt Base
Eccentric Collar Click here

Toyana 7412 A-UO angular contact ball bearings

NTN 800,000
800,000 mm 90,000 mm

Toyana UCF305 bearing units

.7500 in UNF-3B
.5150 in .0500 lb

Toyana 239/600 CW33 spherical roller bearings

166,687 mm 41,275 mm
225,425 mm ISO

Toyana NA6918 needle roller bearings

No SH33M
Pillow Type J7