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W 3778-4 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

W 3778-4: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE NITRILE, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 4.880 INCHES NOMINAL IN, cross-sectional_height: 0.250 INCHES NOMINAL IN, end_item_identification: 01-622-0440. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-662-2389, 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
W 3778-4
NSN: 5331-01-662-2389
FSC: 5331 — O-ring
CAGE: 79218 — WATEROUS COMPANY (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE NITRILE
hardness_rating70.0 SHORE DUROMETER A NOMINAL
center_hole_diameter4.880 INCHES NOMINAL IN
cross-sectional_height0.250 INCHES NOMINAL IN
end_item_identification01-622-0440
NSN5331-01-662-2389
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: W 3778-4 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 HEIGHT: 0.250 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
CENTER HOLE DIAMETER: 4.880 INCHES NOMINAL IN
•
MATERIAL: RUBBER BUTADIENE NITRILE
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.250 INCHES NOMINAL IN
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
CENTER HOLE DIAMETER4.880 INCHES NOMINAL IN
END ITEM IDENTIFICATION01-622-0440
MATERIALRUBBER BUTADIENE NITRILE
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES 1
4260808Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is W 3778-4?
W 3778-4 is a O-RING.
What parts can replace W 3778-4?
There is 1 known substitute for W 3778-4: 4260808. Substitute compatibility should be verified for your specific system.
What is the NSN for W 3778-4?
W 3778-4 is cataloged in the U.S. Government catalog under NSN 5331-01-662-2389. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.