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Technical Data Sheet
PartsTable / COMPONENT / 09-21749
09-21749 ✓ 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 BOOT,DUST AND MOISTURE SEAL is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-737-2351, 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
09-21749
NSN: 5340-00-737-2351
FSC: 5340
CAGE: 16662 — LIFT PARTS MFG CO INC DIV OF ECHLIN MFG CO THE (USA)
SPECIFICATIONS
Part Number09-21749
NSN5340-00-737-2351
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 09-21749 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 20
21749Interchangeable
interchangeable cross-reference
interchangeable
8640279P1Interchangeable
interchangeable cross-reference
interchangeable
1X2492Interchangeable
interchangeable cross-reference
interchangeable
5133-75Interchangeable
interchangeable cross-reference
interchangeable
E21A80-2STSCInterchangeable
interchangeable cross-reference
interchangeable
P48A19-80Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 09-21749?
09-21749 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace 09-21749?
There are 20 known substitutes for 09-21749: 21749, 8640279P1, 1X2492 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 09-21749?
09-21749 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-737-2351. 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