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Technical Data Sheet
PartsTable / COMPONENT / 520203
520203 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The BEARING,ROLLER,CYLINDRICAL is a the manufacturer industrial component. Key specifications include material: STEEL OUTER RING, bore_shape: STRAIGHT, usage_design: EXTERNAL, bore_diameter: 55.0 MILLIMETERS NOMINAL MM, overall_width: 21.0 MILLIMETERS NOMINAL MM, surface_finish: GROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-155-6565, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
520203
NSN: 3110-00-155-6565
FSC: 3110
CAGE: R1120 — SATAIR A/S (DNK)
SPECIFICATIONS
materialSTEEL OUTER RING
bore_shapeSTRAIGHT
ring_styleE
usage_designEXTERNAL
bore_diameter55.0 MILLIMETERS NOMINAL MM
overall_width21.0 MILLIMETERS NOMINAL MM
surface_finishGROUND
inside_diameter0.111 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
major_thickness0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN
locating_featureONE DIRECTION
style_designatorSINGLE ROW, ONE-DIRECTION LOCATING, TWO LIP INNER RING, ONE LIP OUTER RING, SEPARABLE
casehardening_indicatorNOT CASEHARDENED
NSN3110-00-155-6565
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 520203 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL INNER RING
•
BORE SHAPE: STRAIGHT
•
STANDARD TOLERANCE DESIGNATION: RBEC NO.1
•
STYLE DESIGNATOR: SINGLE ROW, ONE-DIRECTION LOCATING, TWO LIP INNER RING, ONE LIP OUTER RING, SEPARABLE
•
INTERNAL FIT-UP DESIGNATION: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL INNER RING
BORE SHAPESTRAIGHT
STANDARD TOLERANCE DESIGNATIONRBEC NO.1
MATERIALSTEEL ROLLER
MATERIALSTEEL OUTER RING
STYLE DESIGNATORSINGLE ROW, ONE-DIRECTION LOCATING, TWO LIP INNER RING, ONE LIP OUTER RING, SEPARABLE
OVERALL WIDTH21.0 MILLIMETERS NOMINAL MM
INTERNAL FIT-UP DESIGNATIONSTANDARD
OVERALL OUTSIDE DIAMETER100.0 MILLIMETERS NOMINAL MM
SURFACE FINISHGROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 33
MU1306DLInterchangeable
interchangeable cross-reference
interchangeable
710420-19Interchangeable
interchangeable cross-reference
interchangeable
AA55598-07JC0Interchangeable
interchangeable cross-reference
interchangeable
690706Interchangeable
interchangeable cross-reference
interchangeable
BU1307LInterchangeable
interchangeable cross-reference
interchangeable
NF307Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520203?
520203 is a BEARING,ROLLER,CYLINDRICAL.
What parts can replace 520203?
There are 33 known substitutes for 520203: MU1306DL, 710420-19, AA55598-07JC0 and 30 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 520203?
520203 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-155-6565. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026