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Technical Data Sheet
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261643 ✓ 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: STEEL COMP 321 OVERALL, outside_diameter: 3.125 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 2.923 INCHES MINIMUM AND 2.952 INCHES MAXIMUM IN, precious_material: SILVER, surface_treatment: SILVER OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-864-7157, 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
261643
NSN: 5330-00-864-7157
FSC: 5330
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OVERALL
outside_diameter3.125 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter2.923 INCHES MINIMUM AND 2.952 INCHES MAXIMUM IN
precious_materialSILVER
surface_treatmentSILVER OVERALL
cross-sectional_thickness0.089 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
cross-sectional_shape_styleHOLLOW
precious_material_and_locationEXTERNAL SURFACES SILVER
material_document_and_classificationAMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationAMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5330-00-864-7157
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 261643 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL COMP 321 OVERALL
•
SURFACE TREATMENT: SILVER OVERALL
•
PRECIOUS MATERIAL AND LOCATION: EXTERNAL SURFACES SILVER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.089 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CIRCULAR
•
APERTURE DIAMETER: 2.923 INCHES MINIMUM AND 2.952 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 321 OVERALL
SURFACE TREATMENTSILVER OVERALL
PRECIOUS MATERIAL AND LOCATIONEXTERNAL SURFACES SILVER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5570 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL THICKNESS0.089 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
STYLE DESIGNATORCIRCULAR
APERTURE DIAMETER2.923 INCHES MINIMUM AND 2.952 INCHES MAXIMUM IN
OUTSIDE DIAMETER3.125 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEHOLLOW
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
MS9375-051Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS9375Interchangeable
interchangeable cross-reference
interchangeable
MS9375-029Interchangeable
interchangeable cross-reference
interchangeable
MS9375-027Interchangeable
interchangeable cross-reference
interchangeable
D83C99Interchangeable
interchangeable cross-reference
interchangeable
318139Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 261643?
261643 is a GASKET.
What parts can replace 261643?
There are 16 known substitutes for 261643: MS9375-051, SAE-AS9375, MS9375-029 and 13 more. Substitute compatibility should be verified for your specific system.
Is 261643 still available?
261643 is currently cancelled.
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Last verified: July 2026