Aetna bearing part number system

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How to read AETNA ball and roller bearing numbers:

Numbers indicate bearing size.
Prefix letters indicate inner race type.
Suffix letters indicate outer race type.

EXAMPLE: K1205PR
Two lip inner ring. Basic Bearing size. Cylindrical outer ring with two roller retainment rings. Steel cage when the cage retains the rollers in the outer ring if the inner ring is removed.

EXAMPLE: KX1205PR
Two lip inner ring. Inside diameter smaller than standard. Basic bearing size. Cylindrical outer ring with two roller retainment rings. Steel cage when the cage retains the rollers in the outer ring if the inner ring is removed.

Part number system

Prefix	Suffix	Definition
.	B	BRONZE CAGE WHEN THE CAGE RETAINS THE ROLLERS IN THE OUTER RING IF THE INNER RING IS REMOVED.
.	K	TWO LIP OUTER RING.
.	L	CYLINDRICAL OUTER RING (NO LIPS).
.	M	ONE LIP OUTER RING.
.	N	ONE LIP OUTER RING WITH ONE ROLLER RETAINMENT RING.
.	P	CYLINDRICAL OUTER RING WITH TWO ROLLER RETAINMENT RINGS.
.	R	STEEL CAGE WHEN THE CAGE RETAINS THE ROLLERS IN THE OUTER RING IF THE OUTER RING IS REMOVED.
.	T	NON-STANDARD OUTER RING WIDTH.
.	U	NON-STANDARD FILLET RADII ON OUTER RING.
.	X	OUTSIDE DIAMETER SMALLER THAN STANDARD.
.	Y	THIS LETTER IS SUED AS A SPARE FOR TH POSSIBILITY OF HAVING TWO SIZES UNDER STANDARD SIZE IN ONE NUMBER OR VICE VERSA.
.	Z	OUTSIDE DIAMETER LARGER THAN STANDARD.
A	.	SPECIAL.
AG	.	SPECIAL AGRICULTURAL BEARING.
B	.	ONE DIRECTION BALL THRUST BEARING, FLAT SEAT, FLAT RACEWAY,BRONZE RETAINER, INCH STANDARD, LIGHT SERIES.
B	.	BRONZE CAGE WHEN THE CAGE RETAINS THE ROLLERS IN THE INNER RING IF THE OUTER RING IS REMOVED.
C	.	ONE DIRECTION BALL THRUST BEARING WITH FLAT SEAT, FLAT RACEWAY, PRESSED STEEL RETAINER, INCH STANDARD, LIGHT SERIES.
E	.	ONE DIRECTION BANDED BALL THRUST BEARING WITH FLAT SEAT, GROOVED RACEWAY AND FULL COMPLEMENT OF BALLS, INCH STANDARD, MEDIUM SERIES.
F	.	ONE DIRECTION BALL THRUST BEARING WITH FLAT SEAT, GROOVED RACEWAY, PRESSED STEEL RETAINER, INCH STANDARD, LIGHT SERIES.
G	.	ONE DIRECTION BALL THRUST BEARING WITH FLAT SEAT, GROOVED RACEWAY, PRESSED TEEL RETAINER, INCH STANDARD MEDIUM SERIES.
K	.	TWO LIP INNER RING.
L	.	CYLINDRICAL INNER RING (NO LIPS).
M	.	ONE LIP INNER RING.
N	.	ONE LIP INNER RING WITH ONE ROLLER RETAINMENT RING.
P	.	CYLINDRICAL INNER RING WITH TWO ROLLER RETAINMENT RINGS.
R	.	ONE PIECE, CHANNEL TYPE, BALL RETAINER.
R	.	STEEL CAGE WHEN THE CAGE RETAINS THE ROLLERS IN THE INNER RING IF THE OUTER RING IS REMOVED.
T	.	NON-STANDARD INNER RING WIDTH.
U	.	NON-STANDARD FILLET RADII ON INNER RING.
W	.	PLAIN THRUST WASHER.
X	.	BORE SMALLER THAN STANDARD.
Z	.	BORE LARGER THAN STANDARD.

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