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Technical Data Sheet
ST7M278-100 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, outside_diameter: 1.249 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 0.958 INCHES NOMINAL IN, material_document_and_classification: AMS 5596 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-049-7385, 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
ST7M278-100
NSN: 5330-01-049-7385
FSC: 5330
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
outside_diameter1.249 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter0.958 INCHES NOMINAL IN
material_document_and_classificationAMS 5596 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-049-7385
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST7M278-100 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
STYLE DESIGNATOR: CIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5596 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER: 1.249 INCHES NOMINAL IN
APERTURE DIAMETER: 0.958 INCHES NOMINAL IN
MATERIAL: NICKEL ALLOY 718 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5596 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.249 INCHES NOMINAL IN
APERTURE DIAMETER0.958 INCHES NOMINAL IN
MATERIALNICKEL ALLOY 718 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
A3475Interchangeable
interchangeable cross-reference
interchangeable
32813-3.0IN PC10 NON-ASBESTOSInterchangeable
interchangeable cross-reference
interchangeable
10119588Interchangeable
Same NIIN cross-reference
interchangeable
AS1895/7-100Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS1895Interchangeable
Same NIIN cross-reference
interchangeable
C7884-100Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST7M278-100?
ST7M278-100 is a GASKET.
What parts can replace ST7M278-100?
There are 6 known substitutes for ST7M278-100: A3475, 32813-3.0IN PC10 NON-ASBESTOS, 10119588 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST7M278-100?
ST7M278-100 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-049-7385. This indicates validated use in U.S. government and defense supply chains.
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