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Technical Data Sheet
PartsTable / O-RING / 5278-11
5278-11 ✓ 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 REACTOR is a the manufacturer industrial component. Key specifications include body_width: 5.310 INCHES NOMINAL IN, body_height: 9.120 INCHES NOMINAL IN, body_length: 10.690 INCHES NOMINAL IN, rating_method: ELECTRICAL SINGLE COMPONENT SINGLE WINDING, inclosure_type: HERMETICALLY SEALED, inductance_type: FIXED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-196-5368, 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
5278-11
NSN: 5331-00-196-5368
FSC: 5331 — O-RING
CAGE: 0KDP7 — KIDDE-FENWAL, LLC (USA)
SPECIFICATIONS
body_width5.310 INCHES NOMINAL IN
body_height9.120 INCHES NOMINAL IN
body_length10.690 INCHES NOMINAL IN
rating_methodELECTRICAL SINGLE COMPONENT SINGLE WINDING
inclosure_typeHERMETICALLY SEALED
inductance_typeFIXED
mounting_methodFLANGE AND UNTHREADED HOLE(S) SINGLE GROUP
winding_quantity1 SINGLE COMPONENT
inductance_rating105.00 MILLIHENRIES MAXIMUM SINGLE COMPONENT SINGLE WINDING
reliability_indicatorNOT ESTABLISHED
winding_operating_current10.1 AMPERES DC MAXIMUM SINGLE COMPONENT SINGLE WINDING
mounting_facility_quantity4 SINGLE GROUP
NSN5331-00-196-5368
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5278-11 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 26
5-09301Interchangeable
interchangeable cross-reference
interchangeable
3918K1Interchangeable
interchangeable cross-reference
interchangeable
143931Interchangeable
interchangeable cross-reference
interchangeable
EAB1707Interchangeable
interchangeable cross-reference
interchangeable
5458Interchangeable
interchangeable cross-reference
interchangeable
67174Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5278-11?
5278-11 is a REACTOR.
What parts can replace 5278-11?
There are 26 known substitutes for 5278-11: 5-09301, 3918K1, 143931 and 23 more. Substitute compatibility should be verified for your specific system.
Is 5278-11 still available?
5278-11 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