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Technical Data Sheet
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A21503 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A21503: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include end_item_identification: USNS HENRY J. KAISER CLASS TAO.

This part is cataloged in the U.S. Government catalog under NSN 5330-00-574-0878, 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
A21503
NSN: 5330-00-574-0878
NIINs: 005740878, 014394242
FSC: 5330 — Packing and Gasket Materials
CAGE: 01379 — EMERSON PROCESS MANAGEMENT VALVE AUTOMATION, INC. (USA)
SPECIFICATIONS
end_item_identificationUSNS HENRY J. KAISER CLASS TAO
NSN5330-00-574-0878
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A21503 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 THICKNESS: 0.006 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 9.000 INCHES NOMINAL IN
•
APERTURE DIAMETER: 6.562 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 7.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.006 INCHES NOMINAL IN
OUTSIDE DIAMETER9.000 INCHES NOMINAL IN
APERTURE DIAMETER6.562 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER7.750 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 3
A021503Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
EB182382PC93Reference document
Same NSN cross-reference
Reference document — Secondary reference
A021503-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A21503?
A21503 is a GASKET.
What parts can replace A21503?
There are 3 known substitutes for A21503: A021503, EB182382PC93, A021503-2. Substitute compatibility should be verified for your specific system.
What is the NSN for A21503?
A21503 is cataloged in the U.S. Government catalog under NSN 5330-00-574-0878. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.