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S31018-2 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

S31018-2: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYPROPYLENE OVERALL, outside_diameter: 0.594 INCHES MINIMUM AND 0.599 INCHES MAXIMUM IN, style_designator: CIRCULAR, aperture_diameter: 0.438 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN, cross-sectional_thickness: 0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN, cross-sectional_shape_style: SOLID SINGLE OR COMPOSITION. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-491-5490, 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
S31018-2
NSN: 5330-00-491-5490
FSC: 5330 — Packing and Gasket Materials
CAGE: 81412 — TREADWELL CORPORATION (DELAWARE) DBA TREADWELL CORP (USA)
SPECIFICATIONS
materialPLASTIC POLYPROPYLENE OVERALL
outside_diameter0.594 INCHES MINIMUM AND 0.599 INCHES MAXIMUM IN
style_designatorCIRCULAR
aperture_diameter0.438 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
cross-sectional_thickness0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
NSN5330-00-491-5490
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S31018-2 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: 0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
STYLE DESIGNATOR: CIRCULAR
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
OUTSIDE DIAMETER: 0.594 INCHES MINIMUM AND 0.599 INCHES MAXIMUM IN
•
APERTURE DIAMETER: 0.438 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
•
MATERIAL: PLASTIC POLYPROPYLENE OVERALL
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
CRITICALITY CODE JUSTIFICATIONZZZY
STYLE DESIGNATORCIRCULAR
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OUTSIDE DIAMETER0.594 INCHES MINIMUM AND 0.599 INCHES MAXIMUM IN
APERTURE DIAMETER0.438 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
MATERIALPLASTIC POLYPROPYLENE OVERALL
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
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 3
S31018-2CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
21-19566MKACPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
21-19566MKAReference document
Same NSN cross-reference
Reference document — Secondary reference
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 S31018-2?
S31018-2 is a GASKET.
What parts can replace S31018-2?
There are 3 known substitutes for S31018-2: S31018-2CP, 21-19566MKACP, 21-19566MKA. Substitute compatibility should be verified for your specific system.
What is the NSN for S31018-2?
S31018-2 is cataloged in the U.S. Government catalog under NSN 5330-00-491-5490. 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.