PartsTable
Technical Data Sheet
PartsTable / O-RING / MIL-G-21569B
MIL-G-21569B ✓ 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 SYNTHETIC OVERALL, hardness_rating: 65.0 SHORE DUROMETER A NOMINAL OVERALL, outside_diameter: 5.125 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 4.625 INCHES NOMINAL IN, elongation_percentage: 250 MAXIMUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-291-5079, 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
MIL-G-21569B
NSN: 5331-00-291-5079
FSC: 5331 — O-RING
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
hardness_rating65.0 SHORE DUROMETER A NOMINAL OVERALL
outside_diameter5.125 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter4.625 INCHES NOMINAL IN
elongation_percentage250 MAXIMUM
cross-sectional_thickness0.062 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
NSN5331-00-291-5079
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-G-21569B 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
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
CENTER HOLE DIAMETER: 5.216 INCHES MINIMUM AND 5.262 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
TEMP RATING: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
•
ELONGATION PERCENTAGE: 331 MAXIMUM
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
CENTER HOLE DIAMETER5.216 INCHES MINIMUM AND 5.262 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TEMP RATING-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
ELONGATION PERCENTAGE331 MAXIMUM
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
MIL-G-21569BInterchangeable
interchangeable cross-reference
interchangeable
104503Interchangeable
interchangeable cross-reference
interchangeable
149121Interchangeable
interchangeable cross-reference
interchangeable
2-050S604-70Interchangeable
interchangeable cross-reference
interchangeable
AS568-050Interchangeable
interchangeable cross-reference
interchangeable
MIL-G-21569Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-G-21569B?
MIL-G-21569B is a GASKET.
What parts can replace MIL-G-21569B?
There are 12 known substitutes for MIL-G-21569B: MIL-G-21569B, 104503, 149121 and 9 more. Substitute compatibility should be verified for your specific system.
Is MIL-G-21569B still available?
MIL-G-21569B 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