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221261 — LINER,EXHAUST DUCT,AIRCRAFT GAS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

221261: LINER,EXHAUST DUCT,AIRCRAFT GAS.

LINER,EXHAUST DUCT,AIRCRAFT GAS. Key specifications include shape: STRAIGHT, material: STEEL CORROSION RESISTING AND PLASTIC POLYTETRAFLUOROETHYLENE OVERALL, special_features: C/O PASSIVE ASPIRATOR; 20 GAGE; HEMOSTATIC ERASER; USED IN TREATING RETINAL BLEEDING, features_provided: STERILE, disposition_after_initial_use: DISPOSABLE. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-220-6148, 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
221261
NSN: 5331-01-220-6148
NIINs: 012206148, 012345052, 013876012
FSC: 5331 — O-ring
CAGE: 77873 — ROCKFORD POWERTRAIN INC DIV POWERTRAIN ROCKFORD, INC. (USA)
SPECIFICATIONS
shapeSTRAIGHT
materialSTEEL CORROSION RESISTING AND PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
special_featuresC/O PASSIVE ASPIRATOR; 20 GAGE; HEMOSTATIC ERASER; USED IN TREATING RETINAL BLEEDING
features_providedSTERILE
disposition_after_initial_useDISPOSABLE
NSN5331-01-220-6148
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 221261 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: 5.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CENTER HOLE DIAMETER5.000 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
2AT287Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2-762-596-21261Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 221261?
221261 is a LINER,EXHAUST DUCT,AIRCRAFT GAS.
What parts can replace 221261?
There are 2 known substitutes for 221261: 2AT287, 2-762-596-21261. Substitute compatibility should be verified for your specific system.
What is the NSN for 221261?
221261 is cataloged in the U.S. Government catalog under NSN 5331-01-220-6148. 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.