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S8P491 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

S8P491: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include overall_width: 2.528 INCHES NOMINAL IN, overall_length: 2.528 INCHES NOMINAL IN, aperture_diameter: 1.380 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN, surface_treatment: ANODIZE OVERALL, gage_ring_thickness: 0.076 INCHES MINIMUM AND 0.084 INCHES MAXIMUM IN, fsc_application_data: FUEL LINES,FABRICATED,AIRFRAME. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-819-4571, 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
S8P491
NSN: 5330-00-819-4571
FSC: 5330 — Packing and Gasket Materials
CAGE: SW461 — HUTCHINSON SEAL DE MEXICO STILLMAN SEAL DIVISION DIV STILLMAN SEAL,JPR,ESPA (MEX)
SPECIFICATIONS
overall_width2.528 INCHES NOMINAL IN
overall_length2.528 INCHES NOMINAL IN
aperture_diameter1.380 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN
surface_treatmentANODIZE OVERALL
gage_ring_thickness0.076 INCHES MINIMUM AND 0.084 INCHES MAXIMUM IN
fsc_application_dataFUEL LINES,FABRICATED,AIRFRAME
outside_corner_radius0.350 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
cross-sectional_thickness0.116 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
cross-sectional_shape_styleMETAL AND SYNTHETIC RUBBER
surface_treatment_document_and_classificationMIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
outside_edge_to_bolt_hole_center_distance_along_width0.380 INCHES NOMINAL IN
outside_edge_to_bolt_hole_center_distance_along_length0.380 INCHES NOMINAL IN
NSN5330-00-819-4571
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S8P491 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: FUEL LINES,FABRICATED,AIRFRAME
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.116 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
•
GAGE RING THICKNESS: 0.076 INCHES MINIMUM AND 0.084 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: METAL AND SYNTHETIC RUBBER
•
APERTURE DIAMETER: 1.380 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATAFUEL LINES,FABRICATED,AIRFRAME
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CROSS-SECTIONAL THICKNESS0.116 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
GAGE RING THICKNESS0.076 INCHES MINIMUM AND 0.084 INCHES MAXIMUM IN
OVERALL LENGTH2.528 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEMETAL AND SYNTHETIC RUBBER
OVERALL WIDTH2.528 INCHES NOMINAL IN
APERTURE DIAMETER1.380 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH1.768 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
SURFACE TREATMENTANODIZE OVERALL
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 2
32-58070-27Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
124156Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S8P491?
S8P491 is a GASKET.
What parts can replace S8P491?
There are 2 known substitutes for S8P491: 32-58070-27, 124156. Substitute compatibility should be verified for your specific system.
What is the NSN for S8P491?
S8P491 is cataloged in the U.S. Government catalog under NSN 5330-00-819-4571. 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.