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Technical Data Sheet
PartsTable / O-RING / 3-6581 REF 5
3-6581 REF 5 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, outside_diameter: 0.375 INCHES NOMINAL IN, center_hole_diameter: 0.239 INCHES NOMINAL IN, cross-sectional_height: 0.070 INCHES NOMINAL IN, end_item_identification: WHISTLE, SHIP. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-598-7202, 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
3-6581 REF 5
NSN: 5331-01-598-7202
FSC: 5331 — O-RING
CAGE: 75214 — KAHLENBERG INDUSTRIES, INC. DBA KAHLENBERG INDUSTRIES INC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
outside_diameter0.375 INCHES NOMINAL IN
center_hole_diameter0.239 INCHES NOMINAL IN
cross-sectional_height0.070 INCHES NOMINAL IN
end_item_identificationWHISTLE, SHIP
NSN5331-01-598-7202
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3-6581 REF 5 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
•
CENTER HOLE DIAMETER: 0.239 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
CROSS-SECTIONAL HEIGHT: 0.070 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.239 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
END ITEM IDENTIFICATIONWHISTLE, SHIP
CROSS-SECTIONAL HEIGHT0.070 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
781626-4Interchangeable
interchangeable cross-reference
interchangeable
8917-4Interchangeable
interchangeable cross-reference
interchangeable
M215-GInterchangeable
interchangeable cross-reference
interchangeable
32164Interchangeable
interchangeable cross-reference
interchangeable
D-3216PC4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3-6581 REF 5?
3-6581 REF 5 is a O-RING.
What parts can replace 3-6581 REF 5?
There are 5 known substitutes for 3-6581 REF 5: 781626-4, 8917-4, M215-G and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3-6581 REF 5?
3-6581 REF 5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-598-7202. 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