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5248K66 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5248K66: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: FRICTION, opening_inside_diameter_for_which_designed: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-526-4101, 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
5248K66
NSN: 5340-01-526-4101
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialPLASTIC
design_typeFRICTION
opening_inside_diameter_for_which_designed0.375 INCHES NOMINAL IN
NSN5340-01-526-4101
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5248K66 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
•
DESIGN TYPE: FRICTION
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 0.375 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OPENING INSIDE DIAMETER FOR WHICH DESIGNED0.375 INCHES NOMINAL IN
MATERIALPLASTIC
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
5248K62Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5248K66?
5248K66 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 5248K66?
There is 1 known substitute for 5248K66: 5248K62. Substitute compatibility should be verified for your specific system.
What is the NSN for 5248K66?
5248K66 is cataloged in the U.S. Government catalog under NSN 5340-01-526-4101. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.