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PartsTable / COMPONENT / R18438
R18438 ✓ 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 SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: STEEL CASE, case_style: SQUARE, seal_width: 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN, housing_bore_diameter: 7.500 INCHES NOMINAL IN, sealing_element_style: ANGULAR, accommodated_shaft_diameter: 6.000 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-290-6405, 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
R18438
NSN: 5330-00-290-6405
FSC: 5330
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialSTEEL CASE
case_styleSQUARE
seal_width0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
housing_bore_diameter7.500 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter6.000 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed2000 FEET PER MINUTE FT
NSN5330-00-290-6405
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: R18438 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
•
SEALING ELEMENT STYLE: ANGULAR
•
HOUSING BORE DIAMETER: 7.500 INCHES NOMINAL IN
•
MATERIAL: STEEL CASE
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 2000 FEET PER MINUTE FT
•
ACCOMMODATED SHAFT DIAMETER: 6.000 INCHES NOMINAL IN
•
SEAL WIDTH: 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER7.500 INCHES NOMINAL IN
MATERIALSTEEL CASE
CASE STYLESQUARE
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER6.000 INCHES NOMINAL IN
SEAL WIDTH0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
N32250PCX8708AInterchangeable
interchangeable cross-reference
interchangeable
X8708APC18438Interchangeable
interchangeable cross-reference
interchangeable
32517Interchangeable
interchangeable cross-reference
interchangeable
LVT5211.16-076374Interchangeable
interchangeable cross-reference
interchangeable
5905PL2156074Interchangeable
interchangeable cross-reference
interchangeable
RCR05G821KInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R18438?
R18438 is a SEAL,PLAIN ENCASED.
What parts can replace R18438?
There are 18 known substitutes for R18438: N32250PCX8708A, X8708APC18438, 32517 and 15 more. Substitute compatibility should be verified for your specific system.
Is R18438 still available?
R18438 is currently cancelled.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026