Precison Bearing
Engineering
Information
Numbering System
1. NMB Numbering
2. JIS Numbering
Component
1. Terminology
2. Retainers
3. Shields/Seals
Accuracy
Measurement
Load Ratings & Life
1. Basic Life
2. Dynamic Load Rating
3. Equivalent Load Factor
4. Static Load Ratng
Internal Clearance
Noise
Preload
1. Purpose
2. Optimum
3. Preload & Stiffness
Interference Fitting
1. On a Shaft
2. Into a Housing
Torque
Lubrication
Materials
1. Rings & Balls
2. Composition
Form Name
Input Name
URL ID
num Number
MyForm
Ebox
Part Numbering System
(Please place the mouse cursor over each column to show part numbering details.)
Ball Bearing - NMB Part Numbering System
BEARING PART NUMBER
BEARING SPEC.
BASIC BEARING NUMBER
BASIC BEARING SUFFIX
DIMENSIONAL
ACCURACY
SPEC.
LUBRICANT SPEC.
1
2
3
4
5
6
7
8
9
10
RING & BALL MATERIAL
BEARING
SERIES
SIZE REF.
ENCLOSURE
SPECIAL FEATURE / NOISE GRADE
RETAINER
PRECISION
GRADE
CLEARANCE
LUBRICANT
TYPE
LUBRICANT FILL QTY.
DD
R-
1560
ZZ
MT
R
P0
P25
LY121
L
No Code
SUJ2 or equivalent (e.g. AISI52100)
DD
NMB developed stainless steel
KK
NMB developed high carbon chromium steel
Radial Ball Bearing
Thrust Series
Metric Series
Inch Series
T-
R-Thick Section
RI-
L-Thin Section
RIF-Flanged
Special Series
A-Extra Thin Section
ZB-
RF-Flanged Thick Section
AS-
LF-Flanged Thin Section
RO-
AF-Flanged Extra Thin Section
NR-Snap Ring on Outer Ring O.D.
The Size Ref. is created from the dimensions of the Bore and Outside Diameter. e.g.
R-1560
O.D. 15mm; Bore 6.0mm
RI-418
O.D. is the numerator of 4/16"
Bore 1/8"
X
Code of bearing internal design
Z
Removable shield, snap ring type
H
Non-removable shield, stamped type
S
Rubber seal, non-contact
D
Rubber seal, contact
K
Non-removable shield, stamped type
Indicate same code twice
when both sides are to be enclosed.
W
Wider width than standard
Y
Thinner width than standard
SD
Special design
No code
Standard noise grade
MT
Extremely noise sensitive application
GT
Hard Disk Drive spindle motors
R
Steel Ribbon Type
H
Steel Crown Type
MN
Molded Nylon Crown Type
JIS Grade;
P0
JIS Grade 0
P5
JIS Grade 5
ABMA Grade;
A3
ABEC 3P
A5
ABEC 5P
PXX
Radial Clearance
Denotes the upper and lower limits of the radial clearance in 0.0001".
(Example)
When the clearance is 5µm -12.5µm, it is 0.0002"-0.0005" and mentioned as P25.
LO
Oil
LG
Grease
LY
Oil or Grease
LD
No Lubricant
No Code
25vol% - 35vol%
X
5vol% - 10vol%
L
10vol% - 15vol%
T
15vol% - 20vol%
H
40vol% - 50vol%
J
50vol% - 60vol%
F
100vol%
Note :Some miniature size bearings have a slightly adjusted grease quantity than above.
Ball Bearing - JIS Part Numbering System
BEARING PART NUMBER
BEARING SPEC.
BASIC BEARING
NUMBER
BASIC BEARING SUFFIX
1
2
3
4
5
6
7
8
9
10
11
12
RING & BALL MATERIAL
BEARING SERIES
BORE SIZE
RETAINER
ENCLOSURE
SPECIAL DESIGN
SPECIAL
FEATURE
CLEARANCE
NOISE
GRADE
PRECISION
GRADE
LUBRICANT TYPE
LUBRICANT FILL QTY.
60
8
ZZ
M3
MT
LY121
H
No Code
SUJ2 or equivalent (e.g. AISI 52100)
KK
NMB developed high carbon chromium steel.
60
62
63
Single row deep groove ball bearing
5
Bore
=
5mm
6
Bore
=
6mm
·
·
·
·
00
Bore
=
10mm
No Code
Steel Ribbon Type
MN
Molded Nylon Crown Type
Z
Non-removable shield, stamped type
S
Rubber seal, non-contact
D
Rubber seal, contact
Indicate same code twice
when both sides are to be enclosed.
NR
Snap Ring on Outer Ring O.D.
SD
Special Design
Radial Clearance
M2
3µm - 8µm
M3
5µm - 10µm
M4
8µm - 13µm
M5
13µm - 20µm
SM
Standard noise grade
MT
Extremely noise sensitive application
JIS Grade;
No Code
JIS Grade 0
P5
JIS Grade 5
ABMA Grade;
A3
ABEC 3P
A5
ABEC 5P
LO
Oil
LG
Grease
LY
Oil or Grease
LD
No Lubricant
No Code
25vol% - 35vol%
X
5vol% - 10vol%
L
10vol% - 15vol%
T
15vol% - 20vol%
H
40vol% - 50vol%
J
50vol% - 60vol%
F
100vol%
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