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Technical Data Sheet
PartsTable / COMPONENT / 521902
521902 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARESQUARE, seal_width: 0.422 INCHES MINIMUM AND 0.422 INCHES MINIMUM AND 0.454 INCHES MAXIMUM0.454 INCHES MAXIMUM IN, temp_rating: -65.0 FAHRENHEIT AND -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT225.0 FAHRENHEIT DEGF, outside_diameter: 3.756 INCHES NOMINAL3.756 INCHES NOMINAL IN, surface_treatment: PLASTIC CASEPLASTIC CASE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-503-5950, 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
521902
NSN: 5330-00-503-5950
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARESQUARE
seal_width0.422 INCHES MINIMUM AND 0.422 INCHES MINIMUM AND 0.454 INCHES MAXIMUM0.454 INCHES MAXIMUM IN
temp_rating-65.0 FAHRENHEIT AND -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT225.0 FAHRENHEIT DEGF
outside_diameter3.756 INCHES NOMINAL3.756 INCHES NOMINAL IN
surface_treatmentPLASTIC CASEPLASTIC CASE
housing_bore_diameter3.736 INCHES MINIMUM AND 3.736 INCHES MINIMUM AND 3.766 INCHES MAXIMUM3.766 INCHES MAXIMUM IN
sealing_element_styleANGULARANGULAR
accommodated_shaft_diameter2.875 INCHES NOMINAL2.875 INCHES NOMINAL IN
material_document_and_classification429945 FSCM 80201 MFR REF SINGLE MATERIAL RESPONSE SEALING ELEMENT429945 FSCM 80201 MFR REF SINGLE MATERIAL RESPONSE SEALING ELEMENT
accommodated_shaft_maximum_rated_speed3600 FEET PER MINUTE3600 FEET PER MINUTE FT
NSN5330-00-503-5950
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 521902 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CASE STYLE: SQUARESQUARE
•
ACCOMMODATED SHAFT DIAMETER: 2.875 INCHES NOMINAL2.875 INCHES NOMINAL IN
•
SEAL WIDTH: 0.422 INCHES MINIMUM AND 0.422 INCHES MINIMUM AND 0.454 INCHES MAXIMUM0.454 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 3.756 INCHES NOMINAL3.756 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULARANGULAR
•
TEMP RATING: -65.0 FAHRENHEIT AND -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT225.0 FAHRENHEIT DEGF
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 3600 FEET PER MINUTE3600 FEET PER MINUTE FT
•
SURFACE TREATMENT: PLASTIC CASEPLASTIC CASE
TECHNICAL CHARACTERISTICS (FLIS)
CASE STYLESQUARESQUARE
ACCOMMODATED SHAFT DIAMETER2.875 INCHES NOMINAL2.875 INCHES NOMINAL IN
SEAL WIDTH0.422 INCHES MINIMUM AND 0.422 INCHES MINIMUM AND 0.454 INCHES MAXIMUM0.454 INCHES MAXIMUM IN
OUTSIDE DIAMETER3.756 INCHES NOMINAL3.756 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULARANGULAR
TEMP RATING-65.0 FAHRENHEIT AND -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT225.0 FAHRENHEIT DEGF
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3600 FEET PER MINUTE3600 FEET PER MINUTE FT
SURFACE TREATMENTPLASTIC CASEPLASTIC CASE
HOUSING BORE DIAMETER3.736 INCHES MINIMUM AND 3.736 INCHES MINIMUM AND 3.766 INCHES MAXIMUM3.766 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
W00Interchangeable
interchangeable cross-reference
interchangeable
3-1LPC58Interchangeable
interchangeable cross-reference
interchangeable
28686Interchangeable
interchangeable cross-reference
interchangeable
0286860007Interchangeable
interchangeable cross-reference
interchangeable
0286980002Interchangeable
interchangeable cross-reference
interchangeable
28698Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 521902?
521902 is a SEAL,PLAIN ENCASED.
What parts can replace 521902?
There are 8 known substitutes for 521902: W00, 3-1LPC58, 28686 and 5 more. Substitute compatibility should be verified for your specific system.
Is 521902 still available?
521902 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026