This document appears to be a catalog listing various part numbers, sizes, and specifications. It includes the following information: 1. Lists part numbers for ball bearing types SN, SD, SG, and their variations in various size ranges from 20-450mm. 2. Provides specifications for each bearing type and size range, including things like inner and outer diameter, seals, shields, recommended grease. 3. Gives manufacturer or brand names for some specific part numbers.

2. NSK CAT.No.128
SN5 SN6SN30
SN31
SN2C SN3C
4 SD2C
SD3C
SN 5B
SN 6B
SN 30B
SN 31B
SN 2B
SN 3B
SN 2BC
SN 3BC
SN 5
SN 6
SN 30
SN 31
SN 2
SN 3
SN 2C
SN 3C
SD 30S
SD 31S
SD 5
SD 6
SD 2
V C
SD 3
SG 5
SD31TS
SD32TS
SD 2C
SD 3C

3. SN5 SN6
20~55 mm
(1)
( ) ( ) ( )
(1)
R 1/8

4. ( x )
(3)
(2) 1/2
0
(3) ZF

5. SN 31 SN 5 SN 6
60~100 mm
(1)
( ) ( ) ( )
(1)
1. SN616 SN519 R 1/8 SN617 SN520 SN3122 R 1/4
2. SN620 SN622

6. ( x )
(2) 1/2
0
(3) ZF
(3)

7. SN 30 SN 31 SN 5 SN 6
110~140 mm
(1)
( ) ( ) ( )
(1)
1. R 1/4
2. SN524 SN624 SN3126 SN3028

8. ( x )
(2
) 1/2
0
(3
) ZF
(3)

9. SD 30S SD 31S SD 5 SD 6
150~260 mm
(1)
1. R 1/4 R 3/8
2. P
(1)

10. (2) ZF
( ) ( ) ( )
(2)

11. SD 30S SD 31S SD 5
280~450 mm
(1)
1. R 1/4 R 3/8
2.
(1)

12. ( ) ( ) ( )
(2) ZF
(2)

13. SG 5 SG 5-0
50~180 mm
2 4
(1)
1. SG518 R 1/8 SG520 R 1/4
2. SG520
(1)

14. (2) 1/2
(3) ZF
( x )
(3)

15. SN 2 C SN 3 C
25~55 mm
(1)
R 1/8
( ) ( )
(1)

16. ( x )
(2) 1/2 0
(3) ZF

17. SN 2 C SN 3 C
60~90 mm
( ) ( )
(1)
SN316C SN218C R 1/8 SN317C R 1/4
(1)

18. ( x )
(2) 1/2
0
(3) ZF

19. SN 2 C SN 3 C
95~160 mm
( ) ( )
(1)
1. SN219C R 1/8 SN319C SN220C R 1/4
2. SN320C SN224C
(1)

20. ( x )
(2) 1/2
0
(3) ZF

21. SD 2 C SD 3 C
170~320 mm
(1)
(1)
1. R 1/4 R 3/8
2.

22. (2) ZF
( ) ( ) ( )