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Technical Data Sheet
PartsTable / COMPONENT / MIL-W-5521B
MIL-W-5521B ✓ 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 RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: LEATHER CATTLEHIDE OVERALL, peripheral_diameter: 0.868 INCHES MINIMUM AND 0.882 INCHES MAXIMUM IN, center_hole_diameter: 0.674 INCHES MINIMUM AND 0.716 INCHES MAXIMUM IN, cross-sectional_height: 0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN, cross-sectional_shape_style: SQUARE/RECTANGULAR, material_document_and_classification: MIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-171-6768, 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-W-5521B
NSN: 5330-00-171-6768
FSC: 5330
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialLEATHER CATTLEHIDE OVERALL
peripheral_diameter0.868 INCHES MINIMUM AND 0.882 INCHES MAXIMUM IN
center_hole_diameter0.674 INCHES MINIMUM AND 0.716 INCHES MAXIMUM IN
cross-sectional_height0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-171-6768
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-W-5521B 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
845-1889834PC92Interchangeable
interchangeable cross-reference
interchangeable
845-1889836PC92Interchangeable
interchangeable cross-reference
interchangeable
2640-085PC92Interchangeable
interchangeable cross-reference
interchangeable
576-4801-1505293REVAPC24Interchangeable
interchangeable cross-reference
interchangeable
2216LS-334Interchangeable
interchangeable cross-reference
interchangeable
563-6800-932097ALT4PC20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-W-5521B?
MIL-W-5521B is a RETAINER,PACKING.
What parts can replace MIL-W-5521B?
There are 28 known substitutes for MIL-W-5521B: 845-1889834PC92, 845-1889836PC92, 2640-085PC92 and 25 more. Substitute compatibility should be verified for your specific system.
Is MIL-W-5521B still available?
MIL-W-5521B 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