Reali-Slim® Bearings Identification and Part Numbering System
Kaydon Bearings marks Reali-Slim
bearings with an (8) or (9) digit part
number for complete identification.
Positions 1-8 identify materials, size,
type, and precision. Position 9
(optional) identifies non-standard
internal fit.
Position

1

2

3

4

5

The examples shown are some of the
most popular options for Reali-Slim
bearings. For custom solutions and
additional information, please refer to
Kaydon Catalog 300.
Positions 1-5 are explained on this
page; Positions 6-9 on the other side.
6

7

8

9

Example

K

G

1

2

0

X

P

0

L

Description

Material

Series

Size

Size

Size

Type

Separator

Precision

Internal Fit

Position 2 – Series Standard Cross Section
Open Bearings

Position 1 – Material
Races/Balls

AA

Seals, Shields

D – AISI 52100 Steel

with One shield

E – AISI 52100 Steel

with Two shields

H – AISI 52100 Steel

with Two seals—Nitrile rubber

K – AISI 52100 Steel

with Two seals and
ENDURAKOTE® plating

M – M-50 Steel

with No seals or shields

N – AISI 52100 Steel

with No seals and
ENDURAKOTE® plating

P – ISI 17-4PH Steel
A
*Ceramic Balls

No shields or seals

Q – AISI 52100 Steel

w
ith No shields or seals*

S – ISI 440C
A
Stainless Steel

with No seals or shields

V – ISI 440C
A
Stainless Steel

with Two shields

W – ISI 440C
A
Stainless Steel

with Two seals—Nitrile rubber

X – ISI 52100 Steel
A
*Ceramic Balls

No shields or seals

Y – ISI 440C
A
Stainless Steel
*Ceramic Balls

No shields or seals

C

with No seals or shields

L – AISI 52100 Steel

B

with One seal—Nitrile rubber

J – AISI 52100 Steel

A

3⁄16" x 3⁄16"
(*.187 x .187)

1⁄4" x 1⁄4"
(.250 x .250)

D

5⁄16" x 5⁄16"
(.312 x .312)

F

1⁄2" x 1⁄2"
(.500 x .500)

G

3⁄4" x 3⁄4"
(.750 x .750)

1" x 1"
(1.000 x 1.000)

Sealed Bearings
JHA

JA

3⁄8" x 3⁄8"
(.375 x .375)

JB

3⁄16" x 1⁄4" 1⁄4" x 1⁄4"
(.187 x .250) (.250 x .250) 5⁄16" x 5⁄16"
(.312 x .312)

JU

JG

1⁄2" x 3⁄8"
(.500 x .375)

* maller section applies when position 3 is
S
alphabetic—see following explanations of
Positions 3, 4, and 5.

1" x 1"
(1.000 x 1.000)

Z – Other
*See Section 6 of Kaydon Catalog 300.

Position 3, 4 and 5 – Size (Bearing Bore)
Numeric Characters - Nominal bearing bore in inches
multiplied by ten
Alphabetic Characters “A” In Position 3 in combination with “A” in Position 2 denotes .187 x .187 Series
“A” In Position 3 in combination with “H” in Position 2 denotes .187 x .250 Series
Examples - 040 = 4.0" Bore, 120 = 12.0" Bore, 400 = 40.0" Bore
"10" following "AA" in Positions 2 & 3 = .187 x .187 Series with 1.0" Bore
"15" following "HA" in Positions 2 & 3 = .187 x .250 Series with 1.5" Bore

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