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R18478 ✓ 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. Key specifications include material: PAPER OVERALL, hole_diameter: 0.531 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 9.125 INCHES NOMINAL IN, aperture_diameter: 7.375 INCHES NOMINAL IN, bolt_circle_diameter: 8.125 INCHES NOMINAL IN, cross-sectional_thickness: 0.005 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 5330-00-163-2452, 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
R18478
NSN: 5330-00-163-2452
FSC: 5330
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialPAPER OVERALL
hole_diameter0.531 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter9.125 INCHES NOMINAL IN
aperture_diameter7.375 INCHES NOMINAL IN
bolt_circle_diameter8.125 INCHES NOMINAL IN
peripheral_flat_quantity2
cross-sectional_thickness0.005 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
gasket_center_to_flat_distance4.063 INCHES NOMINAL IN
NSN5330-00-163-2452
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: R18478 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
MATERIAL: PAPER OVERALL
•
OUTSIDE DIAMETER: 9.125 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.531 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
BOLT CIRCLE DIAMETER: 8.125 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.005 INCHES NOMINAL IN
•
PERIPHERAL FLAT QUANTITY: 2
•
APERTURE DIAMETER: 7.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
MATERIALPAPER OVERALL
OUTSIDE DIAMETER9.125 INCHES NOMINAL IN
HOLE DIAMETER0.531 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
BOLT CIRCLE DIAMETER8.125 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.005 INCHES NOMINAL IN
PERIPHERAL FLAT QUANTITY2
APERTURE DIAMETER7.375 INCHES NOMINAL IN
GASKET CENTER TO FLAT DISTANCE4.063 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
18-478Interchangeable
interchangeable cross-reference
interchangeable
OP1860Interchangeable
interchangeable cross-reference
interchangeable
LMC3012Interchangeable
interchangeable cross-reference
interchangeable
40182Interchangeable
interchangeable cross-reference
interchangeable
1203059Interchangeable
interchangeable cross-reference
interchangeable
AND10136-2003Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R18478?
R18478 is a GASKET.
What parts can replace R18478?
There are 9 known substitutes for R18478: 18-478, OP1860, LMC3012 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R18478?
R18478 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-163-2452. 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