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Technical Data Sheet
PartsTable / COMPONENT / 21820 FN 55
21820 FN 55 ✓ 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 RETAINER,PACKING is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-171-5885, 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
21820 FN 55
NSN: 5330-00-171-5885
FSC: 5330
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
Part Number21820 FN 55
NSN5330-00-171-5885
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21820 FN 55 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 28
411267Interchangeable
interchangeable cross-reference
interchangeable
S37X12Interchangeable
interchangeable cross-reference
interchangeable
P115Interchangeable
interchangeable cross-reference
interchangeable
219404Interchangeable
interchangeable cross-reference
interchangeable
39256CInterchangeable
interchangeable cross-reference
interchangeable
PC212PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21820 FN 55?
21820 FN 55 is a RETAINER,PACKING.
What parts can replace 21820 FN 55?
There are 28 known substitutes for 21820 FN 55: 411267, S37X12, P115 and 25 more. Substitute compatibility should be verified for your specific system.
Is 21820 FN 55 still available?
21820 FN 55 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