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Technical Data Sheet
PartsTable / COMPONENT / 903521
903521 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

BACKUP PLATE AND PANEL ASSEMBLY,. Key specifications include end_item_identification: USED ON LGL-D 2.000 IN PUMP IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-757-5460, 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
903521
NSN: 3120-00-757-5460
FSC: 3120
CAGE: 28968 — CIRCOR INSTRUMENTATION TECHNOLOGIES, INC. DBA HOKE GYROLOK (USA)
SPECIFICATIONS
end_item_identificationUSED ON LGL-D 2.000 IN PUMP IN
NSN3120-00-757-5460
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 903521 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FLANGE OUTSIDE DIAMETER: 1.1780 INCHES MINIMUM AND 1.1980 INCHES MAXIMUM IN
•
CORNER SHAPE: SQUARE OUTSIDE LEFT CORNER
•
STYLE DESIGNATOR: SOLID, EXTERNAL FLANGE ONE END
•
MATERIAL: PLASTIC INNER LAYER
TECHNICAL CHARACTERISTICS (FLIS)
FLANGE OUTSIDE DIAMETER1.1780 INCHES MINIMUM AND 1.1980 INCHES MAXIMUM IN
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE LEFT FLANGE BODY CORNER
CORNER SHAPESQUARE INSIDE LEFT CORNER
MATERIALPLASTIC INNER LAYER
CORNER SHAPESQUARE INSIDE RIGHT CORNER
SURFACE TREATMENTANODIZE EXTERNAL CYLINDRICAL SURFACE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
90352Interchangeable
interchangeable cross-reference
interchangeable
2309584-2Interchangeable
interchangeable cross-reference
interchangeable
903521Interchangeable
interchangeable cross-reference
interchangeable
8148650Interchangeable
interchangeable cross-reference
interchangeable
17290 ITEM 10Interchangeable
interchangeable cross-reference
interchangeable
90241Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 903521?
903521 is a BACKUP PLATE AND PANEL ASSEMBLY,.
What parts can replace 903521?
There are 7 known substitutes for 903521: 90352, 2309584-2, 903521 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 903521?
903521 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-757-5460. 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