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PartsTable / COMPONENT / 18855A
18855A ✓ 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: WOOL SEALING ELEMENT A, case_style: SQUARE, seal_width: 0.875 INCHES NOMINAL IN, housing_bore_diameter: 4.504 INCHES MINIMUM AND 4.508 INCHES MAXIMUM IN, sealing_element_style: VERTICAL-ANGULAR, end_item_identification: MRAP BUFFALO MK2A2. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-515-4917, 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
18855A
NSN: 5330-00-515-4917
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
materialWOOL SEALING ELEMENT A
case_styleSQUARE
seal_width0.875 INCHES NOMINAL IN
housing_bore_diameter4.504 INCHES MINIMUM AND 4.508 INCHES MAXIMUM IN
sealing_element_styleVERTICAL-ANGULAR
end_item_identificationMRAP BUFFALO MK2A2
accommodated_shaft_diameter3.500 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed2000 FEET PER MINUTE FT
NSN5330-00-515-4917
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 18855A 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
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 2000 FEET PER MINUTE FT
•
HOUSING BORE DIAMETER: 4.504 INCHES MINIMUM AND 4.508 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: VERTICAL-ANGULAR
•
CASE STYLE: SQUARE
•
SEAL WIDTH: 0.875 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC SEALING ELEMENT B
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
HOUSING BORE DIAMETER4.504 INCHES MINIMUM AND 4.508 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
SEALING ELEMENT STYLEVERTICAL-ANGULAR
CASE STYLESQUARE
SEAL WIDTH0.875 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT B
MATERIALWOOL SEALING ELEMENT A
ACCOMMODATED SHAFT DIAMETER3.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
3190141-2Interchangeable
interchangeable cross-reference
interchangeable
876431Interchangeable
interchangeable cross-reference
interchangeable
904J138PC25Interchangeable
interchangeable cross-reference
interchangeable
22466Interchangeable
interchangeable cross-reference
interchangeable
41-599-1Interchangeable
interchangeable cross-reference
interchangeable
1028614-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18855A?
18855A is a SEAL,PLAIN ENCASED.
What parts can replace 18855A?
There are 17 known substitutes for 18855A: 3190141-2, 876431, 904J138PC25 and 14 more. Substitute compatibility should be verified for your specific system.
Is 18855A still available?
18855A 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