| SS= AISI stainless steel (440C)
No Code= Chrome alloy steel (52100)
SE= AISI stainless steel rings (440C) with ceramic balls
DD™= NMB 400 Series martensitic stainless steel
S= 400 Series martensitic stainless steel (Std. Ref.)
DS™= 400 Series high performance stainless steel and 440C balls
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RI, R, L= Radial
RIF, RF, LF= Flanged Radial
F= Flanged, Tapered O.D.
MBRI, MBR, MBL= Inner ring relieved and separable
MBRIF, MBRF, MBLF= Inner ring relieved and separable, flanged outer ring
MDRI, MDR, MDL= Inner ring relieved and non-separable
MDRIF, MDRF, MDLF= Inner ring relieved and non-separable, flanged outer ring
MERI, MER, MEL= Outer ring relieved and non-separable
MERIF, MERF, MELF= Outer ring relieved, flanged and non-separable
MBF= Inner ring relieved and separable, outer ring flanged and O.D. tapered
MDF= Inner ring relieved and non-separable, outer ring flanged and O.D. tapered
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Inch Series
First one or two digits indicates O.D. in 16ths of an inch. The following two or three digits indicate the bore size in a fraction of an inch, the first digit being the numerator and the second or the second and third digits being the denominator.
Metric Series
First two digits indicate O.D. in mm. Second two digits indicate I.D. in mm.
X= (following basic size) Indicates special internal design, assigned in numerical sequence, i.e. X1, X2, etc. |
Enclosures
Z= Single metallic shield-removable
ZZ= Double metallic shield-removable
ZO= Single shield on side opposite flange
D= Single rubber seal
DD= Double rubber seal
2RS= Two rubber seals
D1= Single Viton® seal
DD1= Double Viton® seal
L= Single glass-reinforced PTFE seal
LL= Double glass-reinforced PTFE seal
LO= Single seal on side opposite flange
LZ= Glass reinforced PTFE seal and shield with seal on flange side
ZL= Shield and glass reinforced PTFE seal with shield on flange side
H= Single metallic shield non-removable
HH= Double metallic shield non-removable
K= Single metallic shield non-removable
KK= Double metallic shield non-removable
S= Single rubber seal, non-contact
SS= Double rubber seal, non-contact |
Extended Inner Ring
EE= Both sides
E= One side
Special External Dimension
A_ _ = Larger than standard O.D.
A= Semi-standard, larger width and O.D. bearing
A_ _ _ _= Larger O.D. than standard and special width
W= Wider than standard width
Y= Narrower than standard width
N= Larger or smaller bore than standard
Special Design
SD= Special design bearing |
MC= Premium ball & race finish for specific applications
MT= Noiseless motor quality
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CR= Ribbon PTFE coated
F= Full ball complement
H= Crown, land piloted
J= Crown, acetal
KB= Crown phenolic, paper base
KC= Crown phenolic, linen base
KF= Crown phenolic, linen, non keyhole type, outer land piloting
KG= Crown phenolic, paper base, outer land piloted
KM= Full type, phenolic, linen base
KN= Full type, phenolic, paper base
M4= Full type, polyimide
M5= Crown, polyimide
R= Ribbon, land piloted
RD= Ribbon, ball piloted
SF= Composite metal polymer retainer "silver"
T1= Crown, specialty material
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A1= ABEC 1*
A3= ABEC 3, 3P
A5= ABEC 5, 5P, 5T
A7= ABEC 7, 7P, 7T
A9= ABEC 9, 9P
Note: Selected ABEC 9 tolerances are available on all sizes. Please consult NPB.
* A1 miniature and instrument bearings of both the metric and inch configurations meet the tolerances of ABMA Standard 20 for ABEC 1 metric series bearings |
P= Followed by two, three, or four numbers indicates the radial play limits in ten thousandths of an inch. Example: P25 indicates radial play of .0002” to .0005”. |
T= Followed by a number that indicates maximum starting torque in hundreds of mg. mm. Example: T15 indicates a maximum starting torque of 1500 mg. mm.
RT= Followed by a number that indicates maximum running torque in hundreds of mg. mm. Example: RT15 indicates a maximum running torque of 1500 mg. mm.
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Lubricant letter codes are followed by a number to indicate specific type
BC= Following lubricant code indicates barrier coating
LB= Mixture of oil and solvent
LD= Dry, no lubricant
LF= Dry film
LG= Greases
LM= Mixture of oil and grease
LO= Oils
LY= Expanded list of oils and greases
Grease Plate Code (follows lubricant code)
GPL= Light
GPM= Medium
GPH= Heavy
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