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2311051 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2311051: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER, special_features: 4.625 IN. OD IN, center_hole_diameter: 4.250 INCHES NOMINAL IN, end_item_identification: ENGINE, DIESEL P/N 16-251-B PORT ONBOARD 210 FT WMEC MMA COAST GUARD VESSELS FT.

This part is cataloged in the U.S. Government catalog under NSN 5331-01-385-3579, 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
2311051
NSN: 5331-01-385-3579
FSC: 5331 — O-ring
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialRUBBER
special_features4.625 IN. OD IN
center_hole_diameter4.250 INCHES NOMINAL IN
end_item_identificationENGINE, DIESEL P/N 16-251-B PORT ONBOARD 210 FT WMEC MMA COAST GUARD VESSELS FT
NSN5331-01-385-3579
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2311051 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
KEY FEATURES
•
CENTER HOLE DIAMETER: 4.250 INCHES NOMINAL IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
SPECIAL FEATURES4.625 IN. OD IN
CENTER HOLE DIAMETER4.250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONENGINE, DIESEL P/N 16-251-B PORT ONBOARD 210 FT WMEC MMA COAST GUARD VESSELS FT
MATERIALRUBBER
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2311051?
2311051 is a O-RING.
What is the NSN for 2311051?
2311051 is cataloged in the U.S. Government catalog under NSN 5331-01-385-3579. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.