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Miniature & Small ball bearings -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
1560 OD 15mm
Bore 6mm
e.g.) Inch Size
418 OD 4/16 Inch
Bore 1/8 Inch
XInternal 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
MTExtremely noise sensitive application (motor)
SDSpecial Design
W Wider width compared to the standard
Y Thinner width compared to the standard
RRibbon Retainer (steel)
HCrown Retainer (Steel)
MNplastic 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
JIS Grade 5
A3  ABEC 3P
A5  ABEC 5P
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 CodeStandard 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号 Special Feature
Details 5. Retainer Details 4. Shields, Seals -
No Code ZZ NR
No CodeRibbon Retainer
MN Plastic Retainer
(Polyamide Reinforcing agent Is used.)

* There are more different materials of plastics.

No Code Open
Z 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
SDSpecial Design Spec
NRExternal 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
MTExtremely noise sensitive application (motor)
SMgeneral
No CodeJIS Grade 0
P5JIS Grade 5
Lubricant Types
LO
LG
Oil
Grease
LY Grease or Oil
LD No lubrication
No CodeStandard 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

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