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Technical Data Sheet
PartsTable / COMPONENT / 40781A
40781A ✓ 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. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-388-7671, 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
40781A
NSN: 5330-00-388-7671
FSC: 5330
CAGE: 50309 — JOHN REINER & CO. INC. (USA)
SPECIFICATIONS
Part Number40781A
NSN5330-00-388-7671
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 40781A 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
4078-1Interchangeable
interchangeable cross-reference
interchangeable
4501-257Interchangeable
interchangeable cross-reference
interchangeable
68B418000-257Interchangeable
interchangeable cross-reference
interchangeable
4131192Interchangeable
interchangeable cross-reference
interchangeable
M61785Interchangeable
interchangeable cross-reference
interchangeable
60012Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40781A?
40781A is a GASKET.
What parts can replace 40781A?
There are 9 known substitutes for 40781A: 4078-1, 4501-257, 68B418000-257 and 6 more. Substitute compatibility should be verified for your specific system.
Is 40781A still available?
40781A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026