145 Jordan Road, Troy NY, 12180
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Ball Bearing Nomenclature
PACAMOR KUBAR BEARINGS offers a range of retainer designs and materials including, but not limited to Crown, Ribbon, heat and moisture resistant Phenolic, and Torlon (polyamide-imide). In addition to selecting the right retainer for your miniature and instrument bearing application, dissimilar materials can prevent component welding and extend the life of the bearing in a variety of applications.
To this end, we offer standard 400C stainless steel or optional ceramic balls or titanium carbide coated 440C stainless steel balls in our miniature and instrument bearing designs.
PACAMOR KUBAR BEARINGS precision miniature and instrument bearings are available with up to ABEC 9 tolerances (as defined by the American Bearing Manufacturers' Association) with an optional flanged outer ring.
|Special Feature||Material||Type||Style||Retainer||Basic Size||Closure|
X = special feature or change in standard dimension to basic bearing number
A = tapered O.D.
S = AISI44OC stainless steel
F = flanged bearing No Symbol = straight O.D.
R symbol is to be used for all miniature and instrument bearings to signify single row.
Standard retainer could be either one piece crown or two piece ribbon type. When Blank = manufacturer's standard B = Two Piece Ribbon PH = Phenolic Crown Retainer
See basic bearing numbers listed
|Z = Single shield||LL = Double glass-reinforced Teflon seal|
|ZZ = Double shield||RS = Single rubber seal|
|Z1 = Shield on flanged side||2RS = Double rubber seal|
|Z2 = Shield opposite flanged side||V = Single non contact seal|
|T = Single Teflon seal||VV = Double non contact seal|
|TT = Double Teflon seal||UZ = Single shielded narrow width bearings|
|L = Single glass-reinforced Teflon seal||No designation = open bearing.|
|Ring Feature||Radial Play||ABEC Tolerance||Functional Test||Lubrication||Coding / Duplex||Package|
EE = extended inner rings
NR = snap ring on bearing O.D.
Symbol K followed by number indicates radial play in tenths of thousands of an inch.
K25 = 0.0002 to 0.0005
K58 = 0.0005 to 0.0008
A1 = ABEC 1
A3 = ABEC 3
A5 = ABEC 5P
A7 = ABEC 7P
A9 = ABEC 9P
Selected ABEC9 tolerances are available upon request
ST followed by number indicates starting torque in hundreds of MG-MM
E.M.Q. = Electric Motor Quality
|LD = Dry bearings / no lubrication|
|Standard Oil L245X, MIL-L-6085||GP = Indicates grease plate|
|Standard Grease ROYCO27, MIL-G-23827||BC = Indicates barrier coating|
|Alternate lubes available upon request.|
|Tolerance||0.0001 Increment Coding (Standard), In||0.000050 Increment Coding, In|
|Nominal to -0.000050, In||1||A|
|-0.000050 to -0.000100, In||B|
|-0.000100 to -0.000150, In||2||C|
|-0.000150 to -0.000200, In||D|
|-0.000200 to -0.000250, In||3||E|
|-0.000250 to -0.000300, In||F|
|Graded Bore and OD||ZD||XZD|
|Graded Bore Only||ZB||XZB|
|Graded OD Only||ZO||XZO|
|DB = Back to Back Pairing||DT = Tandem Pairing|
|DF = Face to Face Pairing||DU = Universal Pairing|
The following symbols indicate various types available:
Blank = Vial packaging
P = Individual pill packaging
B symbol = Individual box
M symbol = Individual pack per mil-p-197