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78261 ✓ Verified by PartsTable
Clementoni · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

A truly complete scientific kit to discover the secrets of these powerful two and four-wheeled vehicles.<br>2 dynamic models can be built: a dragster and a roadster, and transmission mechanisms can also be checked.<br>Contains more than 130 interchangeable components including: gearbox, gears, rims, tyres, elastics, bars, brushes, sheaves and pins. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-200-8637, 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
78261
NSN: 5340-00-200-8637
FSC: 5340
CAGE: 00198 — PRATT & WHITNEY CANADA CORP DIV PRATT & WHITNEY CANADA CORP. (CAN)
SPECIFICATIONS
materialPLASTIC
drive_typeSCREW SLOT OR SERRATED
design_typeTHREADED
overall_diameter0.375 INCHES NOMINAL IN
end_item_identificationMRAP BUFFALO MK2A2
thread_size_and_series/type_designator3/8-18 NPT
NSN5340-00-200-8637
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 78261 MFR: Clementoni ⚠ 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
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/8-18 NPT
•
DESIGN TYPE: THREADED
•
MATERIAL: PLASTIC
•
DRIVE TYPE: SCREW SLOT OR SERRATED
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/8-18 NPT
DESIGN TYPETHREADED
MATERIALPLASTIC
DRIVE TYPESCREW SLOT OR SERRATED
OVERALL DIAMETER0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
P42Upgraded Successor
successor cross-reference
successor
7HA953Interchangeable
interchangeable cross-reference
interchangeable
10-44Interchangeable
interchangeable cross-reference
interchangeable
353274Interchangeable
interchangeable cross-reference
interchangeable
10-269Interchangeable
interchangeable cross-reference
interchangeable
61560Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 78261?
78261 is a PLUG,PROTECTIVE,DUST AND MOISTUR manufactured by Clementoni.
What parts can replace 78261?
There are 23 known substitutes for 78261: P42, 7HA953, 10-44 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 78261?
78261 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-200-8637. 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