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268559-20-A — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

268559-20-A: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: CELLULOSE OR FIBER NONASBESTOS OVERALL, hole_diameter: 0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 3.531 INCHES NOMINAL IN, overall_length: 4.625 INCHES NOMINAL IN, special_features: ONE 0.625 IN. BOLT HOLE 2.313 IN.

LENGTH 2.750 IN. WIDTH IN, style_designator: NON-CIRCULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-304-4472, 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
268559-20-A
NSN: 5330-01-304-4472
FSC: 5330 — Packing and Gasket Materials
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialCELLULOSE OR FIBER NONASBESTOS OVERALL
hole_diameter0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width3.531 INCHES NOMINAL IN
overall_length4.625 INCHES NOMINAL IN
special_featuresONE 0.625 IN. BOLT HOLE 2.313 IN. LENGTH 2.750 IN. WIDTH IN
style_designatorNON-CIRCULAR
bolt_hole_quantity4
cross-sectional_thickness0.015 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-P-20085 MIL SPEC ALL MATERIAL RESPONSES OVERALL
outside_edge_to_bolt_hole_center_distance_along_width0.438 INCHES NOMINAL IN
outside_edge_to_bolt_hole_center_distance_along_length0.438 INCHES NOMINAL IN
NSN5330-01-304-4472
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 268559-20-A 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
•
CROSS-SECTIONAL THICKNESS: 0.015 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NON-CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-P-20085 MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
BOLT HOLE QUANTITY: 4
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH: 3.750 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.015 INCHES NOMINAL IN
STYLE DESIGNATORNON-CIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-P-20085 MIL SPEC ALL MATERIAL RESPONSES OVERALL
OVERALL LENGTH4.625 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH3.531 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH3.750 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
SPECIAL FEATURESONE 0.625 IN. BOLT HOLE 2.313 IN. LENGTH 2.750 IN. WIDTH IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH2.637 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
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 1
268559PC20Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 268559-20-A?
268559-20-A is a GASKET.
What parts can replace 268559-20-A?
There is 1 known substitute for 268559-20-A: 268559PC20. Substitute compatibility should be verified for your specific system.
What is the NSN for 268559-20-A?
268559-20-A is cataloged in the U.S. Government catalog under NSN 5330-01-304-4472. 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.