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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-5521
MIL-DTL-5521 ✓ 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: LEATHER OVERALL, special_features: PERIPHERAL DIAMETER: 4.359 IN. MIN.

AND 4.391 IN. MAX. IN, center_hole_diameter: 0.183 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN, cross-sectional_height: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-058-2830, 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-DTL-5521
NSN: 5330-00-058-2830
FSC: 5330
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialLEATHER OVERALL
special_featuresPERIPHERAL DIAMETER: 4.359 IN. MIN. AND 4.391 IN. MAX. IN
center_hole_diameter0.183 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
cross-sectional_height0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
NSN5330-00-058-2830
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-DTL-5521 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 HEIGHT: 0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.254 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: LEATHER CATTLEHIDE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYRETAINER,PACKING
CROSS-SECTIONAL HEIGHT0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.254 INCHES NOMINAL IN
END ITEM IDENTIFICATIONW/S: AIRCRAFT, STRATOFORTRESS B-52; TA-4J AIRCRAFT
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALLEATHER CATTLEHIDE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
582813Interchangeable
interchangeable cross-reference
interchangeable
MILR5521Interchangeable
interchangeable cross-reference
interchangeable
582838Interchangeable
interchangeable cross-reference
interchangeable
582868Interchangeable
interchangeable cross-reference
interchangeable
22-14Interchangeable
interchangeable cross-reference
interchangeable
2216LSInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-5521?
MIL-DTL-5521 is a GASKET.
What parts can replace MIL-DTL-5521?
There are 26 known substitutes for MIL-DTL-5521: 582813, MILR5521, 582838 and 23 more. Substitute compatibility should be verified for your specific system.
Is MIL-DTL-5521 still available?
MIL-DTL-5521 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