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210991 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

SEAL,AIR,AIRCRAFT GAS TURBINE EN. Key specifications include material: MICA OVERALL, overall_height: 0.017 INCHES NOMINAL IN, overall_length: 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN, inside_diameter: 0.275 INCHES NOMINAL IN, outside_diameter: 0.568 INCHES NOMINAL IN, style_designator: ROUND, FLAT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2840-00-031-6349, 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
210991
NSN: 2840-00-031-6349
FSC: 2840
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialMICA OVERALL
overall_height0.017 INCHES NOMINAL IN
overall_length0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
inside_diameter0.275 INCHES NOMINAL IN
outside_diameter0.568 INCHES NOMINAL IN
style_designatorROUND, FLAT
end_item_identificationACFT ENG J57
engine_section_locationCOMPRESSOR
criticality_code_justificationAGAV
NSN2840-00-031-6349
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SEAL,AIR,AIRCRAFT GAS TURBINE EN TITLE COMPONENT PN 210991 MFR SEAL,AIR,AIRCRAFT GAS
KEY FEATURES
•
MATERIAL: GRAPHITE OVERALL
•
CRITICALITY CODE JUSTIFICATION: AGAV
•
ENGINE SECTION LOCATION: COMPRESSOR
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONACFT ENG J57
OVERALL LENGTH0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
MATERIALGRAPHITE OVERALL
CRITICALITY CODE JUSTIFICATIONAGAV
ENGINE SECTION LOCATIONCOMPRESSOR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
210998Interchangeable
interchangeable cross-reference
interchangeable
7956938-507Interchangeable
interchangeable cross-reference
interchangeable
21099-1Interchangeable
interchangeable cross-reference
interchangeable
304A104Interchangeable
interchangeable cross-reference
interchangeable
21099Interchangeable
interchangeable cross-reference
interchangeable
261158Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 210991?
210991 is a SEAL,AIR,AIRCRAFT GAS TURBINE EN.
What parts can replace 210991?
There are 6 known substitutes for 210991: 210998, 7956938-507, 21099-1 and 3 more. Substitute compatibility should be verified for your specific system.
Is 210991 still available?
210991 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026