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PartsTable / COMPONENT / Y400K21
Y400K21 ✓ 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: 1.688 INCHES NOMINAL IN, aperture_width: 0.938 INCHES NOMINAL IN, overall_length: 3.312 INCHES NOMINAL IN, aperture_length: 1.750 INCHES NOMINAL IN, inside_corner_radius: 0.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-384-8403, 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
Y400K21
NSN: 5330-00-384-8403
FSC: 5330
CAGE: 63728 — SEALCRAFT CORPORATION (USA)
SPECIFICATIONS
hole_diameter0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width1.688 INCHES NOMINAL IN
aperture_width0.938 INCHES NOMINAL IN
overall_length3.312 INCHES NOMINAL IN
aperture_length1.750 INCHES NOMINAL IN
inside_corner_radius0.125 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
NSN5330-00-384-8403
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: Y400K21 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
•
APERTURE LENGTH: 1.750 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 0.125 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
APERTURE WIDTH: 0.938 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
APERTURE LENGTH1.750 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
OVERALL WIDTH1.688 INCHES NOMINAL IN
INSIDE CORNER RADIUS0.125 INCHES NOMINAL IN
OVERALL LENGTH3.312 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,NO. +3444-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
APERTURE WIDTH0.938 INCHES NOMINAL IN
HOLE DIAMETER0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
5636Interchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/168Interchangeable
interchangeable cross-reference
interchangeable
DMS84114BInterchangeable
interchangeable cross-reference
interchangeable
Z159005636Interchangeable
interchangeable cross-reference
interchangeable
24771Interchangeable
interchangeable cross-reference
interchangeable
618111-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Y400K21?
Y400K21 is a GASKET.
What parts can replace Y400K21?
There are 19 known substitutes for Y400K21: 5636, MIL-E-1/168, DMS84114B and 16 more. Substitute compatibility should be verified for your specific system.
Is Y400K21 still available?
Y400K21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026