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270-1820 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

270-1820: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER, outside_diameter: 5.14 INCHES NOMINAL IN, special_features: COLOR IS LIGHT BLUE;SERVICE TEMPERATURE OF MINUS 40.0 DEGREE TO POSITIVE 150.0 DEGREE CELCIUS, center_hole_diameter: 4.73 INCHES NOMINAL IN, cross-sectional_diameter: 0.21 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-727-6941, 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
270-1820
NSN: 5331-01-727-6941
FSC: 5331 — O-ring
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialRUBBER
outside_diameter5.14 INCHES NOMINAL IN
special_featuresCOLOR IS LIGHT BLUE;SERVICE TEMPERATURE OF MINUS 40.0 DEGREE TO POSITIVE 150.0 DEGREE CELCIUS
center_hole_diameter4.73 INCHES NOMINAL IN
cross-sectional_diameter0.21 INCHES NOMINAL IN
NSN5331-01-727-6941
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 270-1820 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
•
OUTSIDE DIAMETER: 5.14 INCHES NOMINAL IN
•
COLOR: BLUE
•
CENTER HOLE DIAMETER: 4.73 INCHES NOMINAL IN
•
MATERIAL: RUBBER
•
CROSS-SECTIONAL DIAMETER: 0.21 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER5.14 INCHES NOMINAL IN
COLORBLUE
SPECIAL FEATURESCOLOR IS LIGHT BLUE;SERVICE TEMPERATURE OF MINUS 40.0 DEGREE TO POSITIVE 150.0 DEGREE CELCIUS
CENTER HOLE DIAMETER4.73 INCHES NOMINAL IN
MATERIALRUBBER
CROSS-SECTIONAL DIAMETER0.21 INCHES NOMINAL IN
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 270-1820?
270-1820 is a O-RING.
What is the NSN for 270-1820?
270-1820 is cataloged in the U.S. Government catalog under NSN 5331-01-727-6941. 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.