Part Numbering System
The Part Numbering System is composed of the part number and specification.
Minebea has created its own part numbering system called the "NMB part numbering system". The JIS numbering system is based on the system defined in the JIS1513.
NMB Part Numbering
| Bearing Part Number |
| Basic Bearing Number |
| Ring & Ball Material |
Bearing Series |
Size Ref. |
| Details 3. Materials |
- |
- |
| DD |
R- |
1560 |
- No Code
- SUJ2 or equivalent bearing steel
- DD
- Martensitic stainless steel
- CE
- Raceway Ring :
SUJ2 or equivalent bearing steel
Ball :
Ceramic
|
Radial ball bearing (metric)
| R-(RF-) |
Thick type (flanged) |
| L-(LF-) |
Thin Type (flanged) |
| A- |
Ultra Thin Type |
| RNR- |
Thick type with external retaining ring |
| LNR- |
Thin Type with external retaining ring |
Radial ball bearing (Inch)
| RI- |
General Inch type |
| (R-) |
* Used for some of the Inch type |
| RIF- |
Flanged type |
Thrust ball bearing
T-
Special Type
| ZB- |
Direct bearing |
| AS- |
Special shape type |
|
The size Ref. is created from the dimensions of Outside Diamter and Bore.
e.g.) Meter size
e.g.) Inch Size
| 418 |
OD 4/16 Inch
Bore 1/8 Inch |
X Internal design synbols
If it is different from the basic, this comes after basic symbols.
e.g.) 1560X2
OD 15mm
Bore 6mm
Internal design X2 type
|
| Bearing Part Number |
| Basic Bearing Suffix |
| Enclosure |
Noise grade/Special Feature |
Retainer |
| Details 4. Shields, Seals |
- |
Details 5. Retainer |
| ZZ |
MT |
R |
| No Code |
Open |
| Z |
Shield (with Snap ring) |
| H |
Shield |
| K |
Shield |
| S |
Rubber Seal, non-contact |
| D |
Rubber seal, Contact |
Indicate same code twice when both sides are to be enclosed.
e.g.) ZZ,DD
|
MT Extremely noise sensitive application (motor)
SD Special Design
| W |
Wider width compared to the standard |
| Y |
Thinner width compared to the standard |
|
R Ribbon Retainer (steel)
H Crown Retainer (Steel)
MN plastic retainer
(Polyamide /
Reinforcing agent Is used)
* There are more plastic retainer materials.
|
| Bearing Spec |
| Precision Grade |
Clearance |
Lubricant Type |
Grease Fill Quantity |
Details
7. Tolerances and Grades |
Details
9. Internal Clearance |
Details
18. Lubricants |
Details 18. Lubricants |
| P0 |
P25 |
LY121 |
L |
|
Meter Dimensional series
| P0 |
JIS Grade 0 |
| P5 |
JIS Grade 5 |
Inch Dimensional series
|
Radial Clearance
| P13 |
2.5μm ~ 7.5μm |
| P24 |
5.0μm ~ 10.0μm |
| P25 |
5.0μm ~ 12.5μm |
| P58 |
12.5μm ~ 20.0μm |
* Indication Method
upper and lower limits in radial direction are converted to Inch.
e.g.) radial clearance
If RP is 5.0μm ~ 12.5μm, 0.0002 ~ 0.0005 inch is the converted RP. P25
|
Lubricant Types
| LO |
Oil |
| LG |
Grease |
| LY |
Grease or Oil |
| LD |
No lubrication |
|
| No Code |
Standard Fill Amount |
| |
25% ~ 35% |
| X |
5% ~ 10% |
| L |
10% ~ 15% |
| T |
15% ~ 20% |
| H |
40% ~ 50% |
| J |
50% ~ 60% |
Note 1
Fill amount is indicated in percentage of the internal void volume
Note 2
For certain sized miniature bearings, there are cases where the amount has to be corrected
|
NMB part number (example1)
NMB part number (example 2)
JIS Part Number
| Bearing Part Number |
| Basic Bearing Number |
| Ring & Ball Material |
Bearing Series |
Bore Ref. |
| Details 3. Materials |
- |
- |
| Indication e.g.) No Code |
60 |
8 |
- No Code
- SUJ2 or equivalent bearing steel
- CE
- Raceway Ring :
SUJ2 or equivalent bearing steel
Ball : Ceramic
|
67
68
69
60
62
63
64
|
Sinlge row deep groove ball bearing |
|
5 Bore
6 Bore |
5mm
6mm |
| ： |
|
00 Bore
01 Bore |
10mm
12mm |
|
| Bearing Part Number |
| Basic Bearing Suffix |
| Retainer |
Enclosure |
Special Feature |
| Details 5. Retainer |
Details 4. Shields, Seals |
- |
| No Code |
ZZ |
NR |
|
No Code Ribbon Retainer
MN Plastic Retainer
(Polyamide
Reinforcing agent Is used.)
* There are more different materials of plastics.
|
| S |
Rubber Seal, non-contact |
| D |
Rubber Seal, Contact |
Indicate same code twice when both sides are to be enclosed.
e.g.) ZZ,DD
|
SD Special Design Spec
NR External Retaining Ring
Type
|
| Bearing Spec |
| Clearance |
Noise Grade |
Precision Grade |
Lubricant Type |
Grease Fill Quantity |
Details
9. Internal Clearance |
- |
Details
7. Tolerances and Grades |
Details
18. Lubricants |
Details
18. Lubricants |
| M3 |
MT |
P5 |
LY121 |
L |
Radial Clearance
M2
M3
M4
M5 |
3μm ~ 8μm
5μm ~ 10μm
8μm ~ 13μm
13μm ~ 20μm |
|
MT
Extremely noise sensitive application (motor)
SM general
|
No Code
JIS Grade 0
P5
JIS Grade 5
|
Lubricant Types
LO
LG |
Oil
Grease |
| LY |
Grease or Oil |
| LD |
No lubrication |
|
No Code
Standard Fill Amount
25% ~ 35%
X
L
T
H
J |
5% ~ 10%
10% ~ 15%
15% ~ 20%
40% ~ 50%
50% ~ 60% |
Note 1 percentage of void volume
|
JIS Part Number
|
