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661976 — FORMER,AIRCRAFT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

661976: FORMER,AIRCRAFT.

The FORMER,AIRCRAFT is a the manufacturer industrial component. Key specifications include aircraft_mission_design_series: KC-135. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-413-0856, 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
661976
NSN: 5340-00-413-0856
NIINs: 004130856, 012013154
FSC: 5340 — Hardware, Commercial
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
aircraft_mission_design_seriesKC-135
NSN5340-00-413-0856
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 661976 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
•
STYLE DESIGNATOR: DOUBLE ANGLE
•
MATERIAL: STEEL COMP 410
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORDOUBLE ANGLE
END ITEM IDENTIFICATIONTF-30 AIRCRAFT ENGINE
MATERIALSTEEL COMP 410
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 661976?
661976 is a FORMER,AIRCRAFT.
What is the NSN for 661976?
661976 is cataloged in the U.S. Government catalog under NSN 5340-00-413-0856. 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.