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6511203 — SEAL PLUG

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6511203: SEAL PLUG.

The SEAL PLUG is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, overall_length: 2.500 INCHES NOMINAL IN, overall_diameter: 1.000 INCHES NOMINAL IN, special_features: 1.500 COURSE DIAMOND KNURL; THREADED 9/16-18 UNF THROUGH.. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-516-8261, 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
6511203
NSN: 5330-01-516-8261
FSC: 5330 — Packing and Gasket Materials
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
overall_length2.500 INCHES NOMINAL IN
overall_diameter1.000 INCHES NOMINAL IN
special_features1.500 COURSE DIAMOND KNURL; THREADED 9/16-18 UNF THROUGH.
NSN5330-01-516-8261
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6511203 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
•
OVERALL DIAMETER: 1.000 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.000 INCHES NOMINAL IN
OVERALL LENGTH2.500 INCHES NOMINAL IN
SPECIAL FEATURES1.500 COURSE DIAMOND KNURL; THREADED 9/16-18 UNF THROUGH.
MATERIALSTEEL CORROSION RESISTING
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 1
C70866-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 6511203?
6511203 is a SEAL PLUG.
What parts can replace 6511203?
There is 1 known substitute for 6511203: C70866-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 6511203?
6511203 is cataloged in the U.S. Government catalog under NSN 5330-01-516-8261. 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.