KAYDON Reali-Slim thin section bearings are marked for complete identification with an (8) or (9) digit part number. Positions 1-8 identify materials, size, type, and precision. Position 9 (optional) identifies non-standard internal fit.

Position 1: Material

D – AISI 52100 Steel One shield
E – AISI 52100 Steel Two shields
H – AISI 52100 Steel One seal—Nitrile rubber
J – AISI 52100 Steel Two seals—Nitrile rubber
K – AISI 52100 Steel No seals or shields
L – AISI 52100 Steel, AISI 440C stainless steel balls; Two seals and Endurakote® plating
M – M-50 Steel No seals or shields
N – AISI 52100 Steel, AISI 440C stainless steel balls Endurakote plating and No seals
P – AISI 17-4PH Steel Ceramic Balls No shields or seals
Q – AISI 52100 Steel No shields or seals
S – AISI 440C Stainless Steel No seals or shields
V – AISI 440C Stainless Steel Two shields
W – AISI 440C Stainless Steel Two seals—Nitrile rubber
X – AISI 52100 Steel Ceramic Balls No shields or seals
Y – AISI 440C Stainless Steel Ceramic Balls No shields or seals
Z – Other

Position2: Series Standard Cross Section

• AA: 3⁄16" x 3⁄16" (*.187 x .187)
• A: 1⁄4" x 1⁄4" (.250 x .250)
• B: 5⁄16" x 5⁄16" (.312 x .312)
• C: 3⁄8" x 3⁄8" (.375 x .375)
• D: 1⁄2" x 1⁄2" (.500 x .500)
• F: 3⁄4" x 3⁄4" (.750 x .750)
• G: 1" x 1" (1.000 x 1.000)
• JHA: 3⁄16" x 1⁄4" (.187 x .250)
• JA: 1⁄4" x 1⁄4" (.250 x .250)
• JB: 5⁄16" x 5⁄16" (.312 x .312)
• JU: 1⁄2" x 3⁄8" (.500 x .375)
• JG: 1" x 1" (1.000 x 1.000)

Position 3, 4, 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

Position 6 – Bearing Type

A: Angular contact single bearing (not ground for universal duplexing)
B: Angular contact pair—duplexed back to back
C: Radial contact
F: Angular contact pair—duplexed face to face
T: Angular contact pair—duplexed tandem
U: Angular contact single bearing—ground for universal duplexing
X: Four-point contact
Z: Other

Position 7 – Separator - Bearing Type noted

C Non-metallic composite, segmental, “snap-over” type - C, X
D Phenolic laminate, one-piece ring, “snap-over” type - C, X
E Brass, segmental “snap-over” type - C, X
L Nylon one-piece molded ring with “snap-over” pockets - C, X
N Nylon molded strip with “snap-over” pockets - C, X
P Standard one-piece formed ring with “snap-over” pockets- C, X
T Stainless steel, formed ring “snap-over” type - C, X
V Brass, formed ring, “snap-over” pockets - C, X
X PEEK, one-piece molded ring with “snap-over” pockets - C, X

G Nylon one-piece molded ring with circular pockets - A
H Phenolic laminate one-piece machined ring with circular pockets - A
J Nylon molded strip with circular pockets - A
K Phenolic laminate, riveted two-piece ring type - A, C, X
Q PEEK, one-piece molded ring with circular pockets - A
R Standard one-piece formed ring with circular pockets - A
U Stainless steel, formed ring circular pockets type - A
Y Brass, formed ring, circular pockets type - A

M Formed wire strip or segmental cage, “snap-over” pockets - A, C, X
W Formed wire strip or segmental cage, “snap-over” pockets - C, X

F Full complement bearing - A, C, X
S Helical coil spring - C, X
Z Other (toroid ball spacers, spacer slugs, spacer ball or
others available) - A, C, X

Position 8 – Precision

0 Kaydon Precision Class 1 per ABEC 1F
1 Kaydon Precision Class 1 with Class 4 Runouts
2 Kaydon Precision Class 1 with Class 6 Runouts
3 Kaydon Precision Class 3 per ABEC 3F
4 Kaydon Precision Class 4 per ABEC 5F
6 Kaydon Precision Class 6 per ABEC 7F
8 Other

Position 9 – Bearing Internal Fit

A .0000" to .0005" Clearance
B .0000" to .0010" Clearance
C .0005" to .0010" Clearance
D .0005" to .0015" Clearance
E .0010" to .0020" Clearance
F .0015" to .0025" Clearance
G .0020" to .0030" Clearance
H .0030" to .0040" Clearance
I .0040" to .0050" Clearance
J .0050" to .0060" Clearance
K .0000" to .0005" Preload
L .0000" to .0010" Preload
M .0005" to .0010" Preload
N .0005" to .0015" Preload
P .0010" to .0020" Preload
Q .0010" to .0015" Preload
R .0015" to .0025" Preload
S .0020" to .0030" Preload
Z Other clearance or preload not specified above