PartsTable
Technical Data Sheet
PartsTable / O-RING / 4539FREV2PC66
4539FREV2PC66 ✓ 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 O-RING is a the manufacturer industrial component. 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
4539FREV2PC66
NSN: 5331-00-196-5368
FSC: 5331 — O-RING
CAGE: 04537 — ATWOOD & MORRILL CO., INC. DBA WEIR VALVES AND CONTROLS USA (USA)
SPECIFICATIONS
Part Number4539FREV2PC66
NSN5331-00-196-5368
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4539FREV2PC66 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 25
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 4539FREV2PC66?
4539FREV2PC66 is a O-RING.
What parts can replace 4539FREV2PC66?
There are 25 known substitutes for 4539FREV2PC66: 5-09301, 3918K1, 143931 and 22 more. Substitute compatibility should be verified for your specific system.
Is 4539FREV2PC66 still available?
4539FREV2PC66 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