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MS90376-20YB — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MS90376-20YB: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: FRICTION, overall_diameter: 1.375 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN, inside_diameter_length: 0.594 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN, material_document_and_classification: MIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE, tube_outside_diameter_for_which_designed: 1.140 INCHES MINIMUM AND 1.160 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-431-3176, 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
MS90376-20YB
NSN: 5340-01-431-3176
FSC: 5340 — Hardware, Commercial
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialPLASTIC
design_typeFRICTION
overall_diameter1.375 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN
inside_diameter_length0.594 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
end_item_identificationW/S:JOINT STARS TARGET RADAR SYSTEM; SEA WOLF CLASS SSN;AIRCRAFT, AWACS, E-3A;SUBMARINE SHIP CONTROL AND NAVIGATION SYSTEMS; SUBMARINE HYDRAULIC SYSTEMS; MULTIPLE LAUNCH ROCKET SYSTEM A
material_document_and_classificationMIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
tube_outside_diameter_for_which_designed1.140 INCHES MINIMUM AND 1.160 INCHES MAXIMUM IN
NSN5340-01-431-3176
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS90376-20YB 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
•
OVERALL DIAMETER: 1.375 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 1.140 INCHES MINIMUM AND 1.160 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: PLASTIC
•
INSIDE DIAMETER LENGTH: 0.594 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER1.375 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED1.140 INCHES MINIMUM AND 1.160 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
END ITEM IDENTIFICATIONW/S:JOINT STARS TARGET RADAR SYSTEM; SEA WOLF CLASS SSN;AIRCRAFT, AWACS, E-3A;SUBMARINE SHIP CONTROL AND NAVIGATION SYSTEMS; SUBMARINE HYDRAULIC SYSTEMS; MULTIPLE LAUNCH ROCKET SYSTEM A
MATERIALPLASTIC
INSIDE DIAMETER LENGTH0.594 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 5
99208278Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SAE-AS85049/138Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
52108 FIND 25Reference document
Same NSN cross-reference
Reference document — Secondary reference
C235A463-20YReference document
Same NSN cross-reference
Reference document — Secondary reference
M85049/138-38CReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS90376-20YB?
MS90376-20YB is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace MS90376-20YB?
There are 5 known substitutes for MS90376-20YB: 99208278, SAE-AS85049/138, 52108 FIND 25 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS90376-20YB?
MS90376-20YB is cataloged in the U.S. Government catalog under NSN 5340-01-431-3176. 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.