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GC503A3 ✓ 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 CLAMP,INSTRUMENT MOUNTING is a the manufacturer industrial component. Key specifications include width: 0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN, material: ALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061, material_document_and_classification: QQ-A-250/4 OR 11 FED SPEC ALL MATERIAL RESPONSES. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-600-1777, 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
GC503A3
NSN: 5340-00-600-1777
FSC: 5340
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
width0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
materialALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061
material_document_and_classificationQQ-A-250/4 OR 11 FED SPEC ALL MATERIAL RESPONSES
NSN5340-00-600-1777
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: GC503A3 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/4 OR 11 FED SPEC ALL MATERIAL RESPONSES
•
WIDTH: 0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
•
MATERIAL: ALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/4 OR 11 FED SPEC ALL MATERIAL RESPONSES
WIDTH0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
MATERIALALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
E48KL08Upgraded Successor
successor cross-reference
successor
18112Upgraded Successor
successor cross-reference
successor
5261758Interchangeable
interchangeable cross-reference
interchangeable
3549JInterchangeable
interchangeable cross-reference
interchangeable
JT10866Interchangeable
interchangeable cross-reference
interchangeable
10300BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GC503A3?
GC503A3 is a CLAMP,INSTRUMENT MOUNTING.
What parts can replace GC503A3?
There are 13 known substitutes for GC503A3: E48KL08, 18112, 5261758 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GC503A3?
GC503A3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-600-1777. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026