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NAS840 ✓ 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

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: ALUMINUM ALLOY, drive_type: SERRATED, design_type: THREADED, thread_class: 2A A, overall_diameter: 1.430 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN, features_provided: SHOULDER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-016-7383, 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
NAS840
NSN: 5340-01-016-7383
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
drive_typeSERRATED
design_typeTHREADED
thread_class2A A
overall_diameter1.430 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN
features_providedSHOULDER
surface_treatmentCHROMATE
material_document_and_classificationQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator0.750-14 NPT
NSN5340-01-016-7383
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS840 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
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.375-18 NPT
•
OVERALL DIAMETER: 0.437 INCHES NOMINAL IN
•
DESIGN TYPE: THREADED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC, POLYETHYLENE (PP)
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.375-18 NPT
OVERALL DIAMETER0.437 INCHES NOMINAL IN
DESIGN TYPETHREADED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
M5501/5-4Upgraded Successor
successor cross-reference
successor
MIL-C-5501/5Upgraded Successor
successor cross-reference
successor
M5501/5-2Upgraded Successor
successor cross-reference
successor
MILC5501TYPE5CLASSASIZE1-8Upgraded Successor
successor cross-reference
successor
M5501/5-R8Upgraded Successor
successor cross-reference
successor
M5501/5-6Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS840?
NAS840 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace NAS840?
There are 16 known substitutes for NAS840: M5501/5-4, MIL-C-5501/5, M5501/5-2 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS840?
NAS840 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-016-7383. 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