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Technical Data Sheet
Y400K340 ✓ 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 hole_diameter: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 2.938 INCHES NOMINAL IN, overall_length: 6.812 INCHES NOMINAL IN, cross-sectional_thickness: 0.031 INCHES NOMINAL IN, cross-sectional_shape_style: SOLID SINGLE OR COMPOSITION, material_document_and_classification: MIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-384-8422, 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
Y400K340
NSN: 5330-00-384-8422
FSC: 5330
CAGE: 63728 — SEALCRAFT CORPORATION (USA)
SPECIFICATIONS
hole_diameter0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width2.938 INCHES NOMINAL IN
overall_length6.812 INCHES NOMINAL IN
cross-sectional_thickness0.031 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
NSN5330-00-384-8422
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: Y400K340 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
HOLE DIAMETER: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL LENGTH6.812 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
HOLE DIAMETER0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
OVERALL WIDTH2.938 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
25659Interchangeable
interchangeable cross-reference
interchangeable
D47254-163Interchangeable
interchangeable cross-reference
interchangeable
12Z7001-2179Interchangeable
interchangeable cross-reference
interchangeable
660-4Interchangeable
interchangeable cross-reference
interchangeable
Y400K34Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Y400K340?
Y400K340 is a GASKET.
What parts can replace Y400K340?
There are 5 known substitutes for Y400K340: 25659, D47254-163, 12Z7001-2179 and 2 more. Substitute compatibility should be verified for your specific system.
Is Y400K340 still available?
Y400K340 is currently cancelled.
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