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Technical Data Sheet
PartsTable / COMPONENT / 663043R91
663043R91 ✓ 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: LEATHER SEALING ELEMENT A, case_style: SQUARE, seal_width: 0.625 INCHES NOMINAL IN, temp_rating: -65.0 CELSIUS AND 200.0 CELSIUS DEGC, attachment_method: CEMENTED, housing_bore_diameter: 5.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-891-6680, 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
663043R91
NSN: 5330-00-891-6680
FSC: 5330
CAGE: 89346 — NAVISTAR INTL CORP TRUCK BR OHIO PLANT (USA)
SPECIFICATIONS
materialLEATHER SEALING ELEMENT A
case_styleSQUARE
seal_width0.625 INCHES NOMINAL IN
temp_rating-65.0 CELSIUS AND 200.0 CELSIUS DEGC
attachment_methodCEMENTED
housing_bore_diameter5.125 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter3.875 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed3000 FEET PER MINUTE FT
NSN5330-00-891-6680
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 663043R91 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
•
SEAL WIDTH: 0.625 INCHES NOMINAL IN
•
MATERIAL: LEATHER SEALING ELEMENT A
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 3000 FEET PER MINUTE FT
•
SEALING ELEMENT STYLE: ANGULAR
•
HOUSING BORE DIAMETER: 5.125 INCHES NOMINAL IN
•
ACCOMMODATED SHAFT DIAMETER: 3.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SEAL WIDTH0.625 INCHES NOMINAL IN
MATERIALLEATHER SEALING ELEMENT A
CASE STYLESQUARE
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3000 FEET PER MINUTE FT
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER5.125 INCHES NOMINAL IN
MATERIALWOOL SEALING ELEMENT B
ACCOMMODATED SHAFT DIAMETER3.875 INCHES NOMINAL IN
TEMP RATING-65.0 CELSIUS AND 200.0 CELSIUS DEGC
ATTACHMENT METHODCEMENTED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
SM-D-698229Interchangeable
interchangeable cross-reference
interchangeable
455-547Interchangeable
interchangeable cross-reference
interchangeable
6024Interchangeable
interchangeable cross-reference
interchangeable
MS90725-5Interchangeable
interchangeable cross-reference
interchangeable
1-4-20X5-8Interchangeable
interchangeable cross-reference
interchangeable
495AXInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 663043R91?
663043R91 is a SEAL,PLAIN ENCASED.
What parts can replace 663043R91?
There are 13 known substitutes for 663043R91: SM-D-698229, 455-547, 6024 and 10 more. Substitute compatibility should be verified for your specific system.
Is 663043R91 still available?
663043R91 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