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Technical Data Sheet
PartsTable / COMPONENT / 21556919
21556919 ✓ 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: OIL OVERALL, outside_diameter: 0.375 INCHES NOMINAL IN, special_features: MATERIAL: OIL CASTOR OVERALL, style_designator: CIRCULAR, aperture_diameter: 0.193 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, cross-sectional_thickness: 0.062 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-274-8473, 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
21556919
NSN: 5330-00-274-8473
FSC: 5330
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialOIL OVERALL
outside_diameter0.375 INCHES NOMINAL IN
special_featuresMATERIAL: OIL CASTOR OVERALL
style_designatorCIRCULAR
aperture_diameter0.193 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
cross-sectional_thickness0.062 INCHES NOMINAL IN
cross-sectional_shape_styleRECTANGULAR METAL
material_document_and_classificationMIL-L-18331 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-274-8473
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21556919 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
•
OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR METAL
•
CROSS-SECTIONAL THICKNESS: 0.062 INCHES NOMINAL IN
•
MATERIAL: OIL OVERALL
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-L-18331 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
APERTURE DIAMETER: 0.193 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR METAL
CROSS-SECTIONAL THICKNESS0.062 INCHES NOMINAL IN
MATERIALOIL OVERALL
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-18331 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SPECIAL FEATURESMATERIAL: OIL CASTOR OVERALL
APERTURE DIAMETER0.193 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
M76-25606Interchangeable
interchangeable cross-reference
interchangeable
A05219Interchangeable
interchangeable cross-reference
interchangeable
70A3210212-480Interchangeable
interchangeable cross-reference
interchangeable
SKX-231Interchangeable
interchangeable cross-reference
interchangeable
2Z7585-111Interchangeable
interchangeable cross-reference
interchangeable
400-436Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21556919?
21556919 is a GASKET.
What parts can replace 21556919?
There are 24 known substitutes for 21556919: M76-25606, A05219, 70A3210212-480 and 21 more. Substitute compatibility should be verified for your specific system.
Is 21556919 still available?
21556919 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026