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NAS831 ✓ 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

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, POLYETHYLENE (PP), design_type: FRICTION, overall_height: 0.54 INCHES NOMINAL IN, overall_diameter: 1.299 INCHES MINIMUM AND 1.361 INCHES MAXIMUM IN, special_features: CONDUCTIVE; COLOR: BLACK, width_across_flats: 0.025 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-208-1989, 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
NAS831
NSN: 5340-00-208-1989
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeFRICTION
overall_height0.54 INCHES NOMINAL IN
overall_diameter1.299 INCHES MINIMUM AND 1.361 INCHES MAXIMUM IN
special_featuresCONDUCTIVE; COLOR: BLACK
width_across_flats0.025 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
inside_diameter_length0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
end_item_identification2350-01-572-5988 ARMORED RECONNAISSANCE-AIRBORNE ASSAULT
specification/standard_data80205-NAS831 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
round_cap_outside_surface_conditionSMOOTH
material_document_and_classificationMIL-B-81705, TYPE I MIL SPEC SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyCAP, PROTECTIVE
NSN5340-00-208-1989
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS831 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
•
OVERALL DIAMETER: 0.709 INCHES MINIMUM AND 0.771 INCHES MAXIMUM IN
•
INSIDE DIAMETER LENGTH: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: L-P-390, TYPE 1, GRADE 1 FED SPEC SINGLE MATERIAL RESPONSE
•
DESIGN TYPE: FRICTION
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.709 INCHES MINIMUM AND 0.771 INCHES MAXIMUM IN
INSIDE DIAMETER LENGTH0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONL-P-390, TYPE 1, GRADE 1 FED SPEC SINGLE MATERIAL RESPONSE
DESIGN TYPEFRICTION
MATERIALPLASTIC, POLYETHYLENE (PP)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
MS90376-14RUpgraded Successor
successor cross-reference
successor
494115000600Upgraded Successor
successor cross-reference
successor
34310513017Interchangeable
Same NIIN cross-reference
interchangeable
P4021569-03Interchangeable
Same NIIN cross-reference
interchangeable
MS90376-8RInterchangeable
Same NIIN cross-reference
interchangeable
MS25178-8Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS831?
NAS831 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace NAS831?
There are 7 known substitutes for NAS831: MS90376-14R, 494115000600, 34310513017 and 4 more. Substitute compatibility should be verified for your specific system.
Is NAS831 still available?
NAS831 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026