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Technical Data Sheet
420743 ✓ Verified by PartsTable
Legrand · 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 PACKING is a Legrand industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-303-0424, 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
420743
NSN: 5330-00-303-0424
FSC: 5330
CAGE: 03670 — TYCO FIRE PRODUCTS LP (USA)
SPECIFICATIONS
Part Number420743
ManufacturerLegrand
NSN5330-00-303-0424
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 420743 MFR: Legrand ⚠ 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 11
43264-3Interchangeable
interchangeable cross-reference
interchangeable
43264Interchangeable
interchangeable cross-reference
interchangeable
43264PT3Interchangeable
interchangeable cross-reference
interchangeable
292-4782G1Interchangeable
interchangeable cross-reference
interchangeable
RYG9166331Interchangeable
interchangeable cross-reference
interchangeable
9166331Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 420743?
420743 is a PACKING manufactured by Legrand.
What parts can replace 420743?
There are 11 known substitutes for 420743: 43264-3, 43264, 43264PT3 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 420743?
420743 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-303-0424. This indicates validated use in U.S. government and defense supply chains.
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