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Technical Data Sheet
PartsTable / COMPONENT / 643431
643431 ✓ 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 POLARITY SWITCH ASSEMBLY is a the manufacturer industrial component. Key specifications include end_item_identification: AIRCRAFT MODEL S-3A A. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-291-7462, 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
643431
NSN: 5330-00-291-7462
FSC: 5330
CAGE: 58275 — SASCO INC CANADIAN DIV
SPECIFICATIONS
end_item_identificationAIRCRAFT MODEL S-3A A
NSN5330-00-291-7462
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 643431 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
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
MATERIAL: CORK OVERALL
•
STYLE DESIGNATOR: OVAL
•
APERTURE LENGTH: 11.938 INCHES NOMINAL IN
•
APERTURE WIDTH: 3.000 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.125 INCHES NOMINAL IN
•
BEARING SURFACE WIDTH: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
MATERIALCORK OVERALL
STYLE DESIGNATOROVAL
APERTURE LENGTH11.938 INCHES NOMINAL IN
APERTURE WIDTH3.000 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.125 INCHES NOMINAL IN
BEARING SURFACE WIDTH0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
37970Interchangeable
interchangeable cross-reference
interchangeable
GGG-C-755Interchangeable
interchangeable cross-reference
interchangeable
B364Interchangeable
interchangeable cross-reference
interchangeable
717-001614Interchangeable
interchangeable cross-reference
interchangeable
1964CInterchangeable
interchangeable cross-reference
interchangeable
NR36-113Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 643431?
643431 is a POLARITY SWITCH ASSEMBLY.
What parts can replace 643431?
There are 18 known substitutes for 643431: 37970, GGG-C-755, B364 and 15 more. Substitute compatibility should be verified for your specific system.
Is 643431 still available?
643431 is currently cancelled.
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Last verified: July 2026