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2121754 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2121754: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include corner_shape: CHAMFERED ALL CORNERS, flange_width: 0.250 INCHES NOMINAL IN, overall_length: 1.271 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN, surface_finish: 125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY, special_features: REFER TO DRAWING FOR ADDITIONAL DETAILS, style_designator: SOLID, EXTERNAL FLANGE ONE END. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-255-6273, 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
2121754
NSN: 5331-00-255-6273
NIINs: 002556273, 015947176
FSC: 5331 — O-ring
CAGE: 23892 — LOCKHEED MARTIN SERVICES, LLC (USA)
SPECIFICATIONS
corner_shapeCHAMFERED ALL CORNERS
flange_width0.250 INCHES NOMINAL IN
overall_length1.271 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN
surface_finish125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
special_featuresREFER TO DRAWING FOR ADDITIONAL DETAILS
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter3.1496 INCHES MINIMUM AND 3.1503 INCHES MAXIMUM IN
body_outside_diameter3.623 INCHES MINIMUM AND 3.624 INCHES MAXIMUM IN
flange_outside_diameter4.625 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyRETAINER,BEARING
NSN5331-00-255-6273
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2121754 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
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 2.229 INCHES MINIMUM AND 2.249 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
CENTER HOLE DIAMETER2.229 INCHES MINIMUM AND 2.249 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2121754?
2121754 is a O-RING.
What is the NSN for 2121754?
2121754 is cataloged in the U.S. Government catalog under NSN 5331-00-255-6273. 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.