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Technical Data Sheet
PartsTable / COMPONENT / 255721PC55
255721PC55 ✓ 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 5330-00-171-6768, 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
255721PC55
NSN: 5330-00-171-6768
FSC: 5330
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
Part Number255721PC55
NSN5330-00-171-6768
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 255721PC55 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 27
845-1889834PC92Interchangeable
interchangeable cross-reference
interchangeable
845-1889836PC92Interchangeable
interchangeable cross-reference
interchangeable
2640-085PC92Interchangeable
interchangeable cross-reference
interchangeable
576-4801-1505293REVAPC24Interchangeable
interchangeable cross-reference
interchangeable
2216LS-334Interchangeable
interchangeable cross-reference
interchangeable
563-6800-932097ALT4PC20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 255721PC55?
255721PC55 is a RETAINER,PACKING.
What parts can replace 255721PC55?
There are 27 known substitutes for 255721PC55: 845-1889834PC92, 845-1889836PC92, 2640-085PC92 and 24 more. Substitute compatibility should be verified for your specific system.
Is 255721PC55 still available?
255721PC55 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