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181563 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

181563: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 OVERALL, outside_diameter: 20.875 INCHES MINIMUM AND 20.880 INCHES MAXIMUM IN, style_designator: CIRCULAR, aperture_diameter: 20.621 INCHES MINIMUM AND 20.644 INCHES MAXIMUM IN, fsc_application_data: ENGINE,AIRCRAFT,JET, cross-sectional_thickness: 0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-641-8174, 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
181563
NSN: 5330-00-641-8174
NIINs: 006418174, 013917349
FSC: 5330 — Packing and Gasket Materials
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OVERALL
outside_diameter20.875 INCHES MINIMUM AND 20.880 INCHES MAXIMUM IN
style_designatorCIRCULAR
aperture_diameter20.621 INCHES MINIMUM AND 20.644 INCHES MAXIMUM IN
fsc_application_dataENGINE,AIRCRAFT,JET
cross-sectional_thickness0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
cross-sectional_shape_styleHOLLOW
material_document_and_classificationAMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-641-8174
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 181563 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
•
FSC APPLICATION DATA: ENGINE,AIRCRAFT,JET
•
CROSS-SECTIONAL THICKNESS: 0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: HOLLOW
•
OUTSIDE DIAMETER: 20.875 INCHES MINIMUM AND 20.880 INCHES MAXIMUM IN
•
APERTURE DIAMETER: 20.621 INCHES MINIMUM AND 20.644 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 321 OVERALL
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATAENGINE,AIRCRAFT,JET
CROSS-SECTIONAL THICKNESS0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLEHOLLOW
OUTSIDE DIAMETER20.875 INCHES MINIMUM AND 20.880 INCHES MAXIMUM IN
APERTURE DIAMETER20.621 INCHES MINIMUM AND 20.644 INCHES MAXIMUM IN
MATERIALSTEEL COMP 321 OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
20875-7-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
EON-020875-07-03-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 181563?
181563 is a GASKET.
What parts can replace 181563?
There are 2 known substitutes for 181563: 20875-7-3, EON-020875-07-03-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 181563?
181563 is cataloged in the U.S. Government catalog under NSN 5330-00-641-8174. 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.