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NAS831 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

NAS831: CAP,PROTECTIVE,DUST AND MOISTURE.

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 U.S.

Government catalog 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
NIINs: 002081989, 002118188, 004935835, 011516159, 014340880, 015158196, 015293897, 015489945, 015489960, 015510866, 015556602, 015556603, 015556604, 015556605, 015556607, 015556608, 015557635, 016026833, 016458439, 016606401, 016699995
FSC: 5340 — Hardware, Commercial
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
•
DESIGN TYPE: FRICTION
•
OVERALL DIAMETER: 0.709 INCHES MINIMUM AND 0.771 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
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
•
INSIDE DIAMETER LENGTH: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER0.709 INCHES MINIMUM AND 0.771 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
MATERIALPLASTIC, POLYETHYLENE (PP)
INSIDE DIAMETER LENGTH0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 5
34310513017Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
P4021569-03Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS90376-8RReference document
Same NSN cross-reference
Reference document — Secondary reference
MS25178-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
NAS831-8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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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 5 known substitutes for NAS831: 34310513017, P4021569-03, MS90376-8R and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS831?
NAS831 is cataloged in the U.S. Government catalog under NSN 5340-00-208-1989. This indicates validated use in U.S. government and defense supply chains.
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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.