Bearing ISO codes

Question 1

6XXX

Answer 1

Single row deep groove ball bearing, or Conrad

Question 2

0XXX

Answer 2

Double row angular contact ball bearing

Question 3

1XXX

Answer 3

double row self aligning ball bearing

Question 4

2XXX

Answer 4

spherical roller bearing

Question 5

3XXX

Answer 5

Tapered roller bearing

Question 6

4XXX

Answer 6

Double row deep groove ball bearing

Question 7

5XXX

Answer 7

Ball thrust bearing

Question 8

7XXX

Answer 8

Single row angular contact bearing

Question 9

8XXX

Answer 9

Cylindrical roller thrust bearing

Question 10

NXXX

Answer 10

Single row cylindrical roller radial load bearing

Question 11

NNUXXX

Answer 11

Double row cylindrical roller bearing

Question 12

QJXXX

Answer 12

Four point angular contact bearing

Question 13

X0XX

Answer 13

Series 00 Ultra Light

Question 14

X1XX

Answer 14

Series 100 Extra Light

Question 15

X2XX

Answer 15

Series 200 Light

Question 16

X3XX

Answer 16

Series 300 Medium

Question 17

X4XX

Answer 17

Series 400 Medium

Question 18

XX00

Answer 18

10mm Bore

Question 19

XX01

Answer 19

12mm Bore

Question 20

XX02

Answer 20

15mm Bore

Question 21

XX03

Answer 21

17mm Bore

Question 22

XX04

Answer 22

20mm Bore

Note: From 20-480mm multiply the last two digits of bearing number by 5 to get the bore

Question 23

XX05

Answer 23

25mm Bore

Note: From 20-480mm multiply the last two digits of bearing number by 5 to get the bore

Question 24

XX30

Answer 24

150mm Bore

Note: From 20-480mm multiply the last two digits of bearing number by 5 to get the bore

Question 25

XX500

Answer 25

500mm bore Note: Above 480mm bore size is directly included

Question 26

XXXXK

Answer 26

tapered bore, 1:12 taper

Question 27

XXXXK30

Answer 27

tapered bore, 1:30 taper

Question 28

XXXX Z

Answer 28

Shielded bearing

Question 29

XXXX RS

Answer 29

Rubbing seal

Question 30

XXXX 2RS

Answer 30

Rubbing seals, both sides

Question 31

XXXX P2

Answer 31

Small tolerance

Question 32

XXXX P6

Answer 32

Large tolerance

Question 33

XXXX C1

Answer 33

Smallest clearance Used only when freedom from all vibration is required Note: No mark indicates normal clearance

Question 34

XXXX C2

Answer 34

Less than normal clearance Used when a normal bearing would allow too much deflection in the shaft Note: No mark indicates normal clearance

Question 35

XXXX C3

Answer 35

More than normal clearance Used where running temperature on a normal bearing would eliminate all clearance Note: No mark indicates normal clearance

Question 36

XXXX C4

Answer 36

More clearance than C3 Used when there are press fits on both rings Note: No mark indicates normal clearance

Question 37

XXXX C5

Answer 37

More clearance than C4 Used when there are press fits in both rings, as well as a rise in temperature Note: No mark indicates normal clearance

Question 38

XX3

Answer 38

3mm bore Note: under 10mm, bearing bore is directly written

Question 39

XX8

Answer 39

8mm bore Note: under 10mm, bearing bore is directly written