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H643-6503-1 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

H643-6503-1: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER ETHYLENE-PROPYLENE CLASS EPM, center_hole_diameter: 3.975 INCHES NOMINAL IN, cross-sectional_height: 0.210 INCHES NOMINAL IN, material_document_and_classification: MIL-R-83485,TYPE-1 MIL SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-498-8922, 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
H643-6503-1
NSN: 5331-01-498-8922
FSC: 5331 — O-ring
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialRUBBER ETHYLENE-PROPYLENE CLASS EPM
center_hole_diameter3.975 INCHES NOMINAL IN
cross-sectional_height0.210 INCHES NOMINAL IN
material_document_and_classificationMIL-R-83485,TYPE-1 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5331-01-498-8922
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: H643-6503-1 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: 0.210 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-83485,TYPE-1 MIL SPEC SINGLE MATERIAL RESPONSE
•
CENTER HOLE DIAMETER: 3.975 INCHES NOMINAL IN
•
MATERIAL: RUBBER ETHYLENE-PROPYLENE CLASS EPM
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.210 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-83485,TYPE-1 MIL SPEC SINGLE MATERIAL RESPONSE
CENTER HOLE DIAMETER3.975 INCHES NOMINAL IN
MATERIALRUBBER ETHYLENE-PROPYLENE CLASS EPM
SUBSTITUTES & CROSS-REFERENCES 2
M83485/1-345Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
M83485-345Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H643-6503-1?
H643-6503-1 is a O-RING.
What parts can replace H643-6503-1?
There are 2 known substitutes for H643-6503-1: M83485/1-345, M83485-345. Substitute compatibility should be verified for your specific system.
What is the NSN for H643-6503-1?
H643-6503-1 is cataloged in the U.S. Government catalog under NSN 5331-01-498-8922. 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.