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Technical Data Sheet
PartsTable / COMPONENT / K-20-3218
K-20-3218 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The GASKET is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-STYRENE CLASS SBR OVERALL, temp_rating: -20.0 FAHRENHEIT AND 130.0 FAHRENHEIT DEGF, hole_diameter: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, hardness_rating: 40.0 SHORE DUROMETER A MINIMUM AND 50.0 SHORE DUROMETER A MAXIMUM OVERALL, outside_diameter: 7.000 INCHES NOMINAL IN, style_designator: CIRCULAR. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-044-5241, 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
K-20-3218
NSN: 5330-01-044-5241
FSC: 5330
CAGE: 88371 — CONNOR ENGINEERING CORP (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
temp_rating-20.0 FAHRENHEIT AND 130.0 FAHRENHEIT DEGF
hole_diameter0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
hardness_rating40.0 SHORE DUROMETER A MINIMUM AND 50.0 SHORE DUROMETER A MAXIMUM OVERALL
outside_diameter7.000 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter4.500 INCHES NOMINAL IN
bolt_hole_quantity8
bolt_circle_diameter5.750 INCHES NOMINAL IN
cross-sectional_thickness0.125 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-R-900 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-044-5241
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: K-20-3218 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
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL: RUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
•
TEMP RATING: -20.0 FAHRENHEIT AND 130.0 FAHRENHEIT DEGF
•
BOLT CIRCLE DIAMETER: 5.750 INCHES NOMINAL IN
•
HARDNESS RATING: 40.0 SHORE DUROMETER A MINIMUM AND 50.0 SHORE DUROMETER A MAXIMUM OVERALL
•
OUTSIDE DIAMETER: 7.000 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-900 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
HOLE DIAMETER: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCIRCULAR
MATERIALRUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
TEMP RATING-20.0 FAHRENHEIT AND 130.0 FAHRENHEIT DEGF
BOLT CIRCLE DIAMETER5.750 INCHES NOMINAL IN
HARDNESS RATING40.0 SHORE DUROMETER A MINIMUM AND 50.0 SHORE DUROMETER A MAXIMUM OVERALL
OUTSIDE DIAMETER7.000 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-900 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
HOLE DIAMETER0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
BOLT HOLE QUANTITY8
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
1472-4Interchangeable
interchangeable cross-reference
interchangeable
31688G4Interchangeable
interchangeable cross-reference
interchangeable
1472-3PORTInterchangeable
interchangeable cross-reference
interchangeable
05114-88702Interchangeable
interchangeable cross-reference
interchangeable
ANSI B74.18Interchangeable
interchangeable cross-reference
interchangeable
686-390-0020Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K-20-3218?
K-20-3218 is a GASKET.
What parts can replace K-20-3218?
There are 10 known substitutes for K-20-3218: 1472-4, 31688G4, 1472-3PORT and 7 more. Substitute compatibility should be verified for your specific system.
Is K-20-3218 still available?
K-20-3218 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026