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476859 ✓ 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 SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_height: 0.375 INCHES NOMINAL IN, style_designator: PLAIN, seat_angle_in_deg: 25.000 NOMINAL, surface_treatment: PASSIVATE OVERALL, body_inside_diameter: 1.021 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 5340-00-434-5527, 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
476859
NSN: 5340-00-434-5527
FSC: 5340
CAGE: 82877 — ROTRON INCORPORATED (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_height0.375 INCHES NOMINAL IN
style_designatorPLAIN
seat_angle_in_deg25.000 NOMINAL
surface_treatmentPASSIVATE OVERALL
body_inside_diameter1.021 INCHES NOMINAL IN
body_outside_diameter1.668 INCHES NOMINAL IN
seating_surface_shapeANGULAR
NSN5340-00-434-5527
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 476859 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 5
159023Interchangeable
interchangeable cross-reference
interchangeable
5021-30Interchangeable
interchangeable cross-reference
interchangeable
5050312Interchangeable
interchangeable cross-reference
interchangeable
BTL65626AInterchangeable
interchangeable cross-reference
interchangeable
476859Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 476859?
476859 is a SEAT,VALVE.
What parts can replace 476859?
There are 5 known substitutes for 476859: 159023, 5021-30, 5050312 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 476859?
476859 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-434-5527. 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