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Technical Data Sheet
PartsTable / COMPONENT / 202578
202578 ✓ 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 ADAPTER ASSEMBLY,VALVE is a the manufacturer industrial component. Key specifications include material: ASBESTOS AND RUBBER CHLOROPRENE CLASS CR OVERALL, hole_diameter: 0.343 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 4.320 INCHES NOMINAL IN, special_features: EXT.PSU 90/264VAC VAC, style_designator: CIRCULAR, aperture_diameter: 3.240 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-459-9825, 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
202578
NSN: 5330-00-459-9825
FSC: 5330
CAGE: 61208 — TWIN DISC, INCORPORATED DBA TWIN DISC MID-ATLANTIC (USA)
SPECIFICATIONS
materialASBESTOS AND RUBBER CHLOROPRENE CLASS CR OVERALL
hole_diameter0.343 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter4.320 INCHES NOMINAL IN
special_featuresEXT.PSU 90/264VAC VAC
style_designatorCIRCULAR
aperture_diameter3.240 INCHES NOMINAL IN
bolt_hole_quantity8
bolt_circle_diameter3.745 INCHES MINIMUM AND 3.755 INCHES MAXIMUM IN
end_item_identificationSWITCH, TANK
cross-sectional_thickness0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-G-12803,+1151-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
NSN5330-00-459-9825
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 202578 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
STYLE DESIGNATOR: CIRCULAR
•
BOLT CIRCLE DIAMETER: 3.745 INCHES MINIMUM AND 3.755 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 4.320 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 8
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-12803,+1151-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
HOLE DIAMETER: 0.343 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
CROSS-SECTIONAL THICKNESS: 0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
STYLE DESIGNATORCIRCULAR
BOLT CIRCLE DIAMETER3.745 INCHES MINIMUM AND 3.755 INCHES MAXIMUM IN
OUTSIDE DIAMETER4.320 INCHES NOMINAL IN
BOLT HOLE QUANTITY8
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,+1151-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
HOLE DIAMETER0.343 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
CROSS-SECTIONAL THICKNESS0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
MATERIALASBESTOS AND RUBBER CHLOROPRENE CLASS CR OVERALL
APERTURE DIAMETER3.240 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
202578Interchangeable
interchangeable cross-reference
interchangeable
103563Interchangeable
interchangeable cross-reference
interchangeable
103563 ITEM NO 6Interchangeable
interchangeable cross-reference
interchangeable
D37010Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 202578?
202578 is a ADAPTER ASSEMBLY,VALVE.
What parts can replace 202578?
There are 4 known substitutes for 202578: 202578, 103563, 103563 ITEM NO 6 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 202578?
202578 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-459-9825. 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