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Technical Data Sheet
PartsTable / COMPONENT / ST9M621-437
ST9M621-437 ✓ 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

PLUG,PROTECTIVE,DUST AND MOISTUR. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-837-9912, 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
ST9M621-437
NSN: 5340-00-837-9912
FSC: 5340
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
Part NumberST9M621-437
NSN5340-00-837-9912
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST9M621-437 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
353243Interchangeable
interchangeable cross-reference
interchangeable
353403Interchangeable
interchangeable cross-reference
interchangeable
2633Interchangeable
interchangeable cross-reference
interchangeable
FYG5R0KInterchangeable
interchangeable cross-reference
interchangeable
0813-0006Interchangeable
interchangeable cross-reference
interchangeable
77C718087P003Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST9M621-437?
ST9M621-437 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace ST9M621-437?
There are 18 known substitutes for ST9M621-437: 353243, 353403, 2633 and 15 more. Substitute compatibility should be verified for your specific system.
Is ST9M621-437 still available?
ST9M621-437 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