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Technical Data Sheet
PartsTable / COMPONENT / NAS817-2
NAS817-2 ✓ 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: ALUMINUM, design_type: THREADED, thread_class: 1B, overall_diameter: 0.438 INCHES NOMINAL IN, surface_treatment: ANODIZE, inside_diameter_length: 0.563 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-682-2112, 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
NAS817-2
NSN: 5340-00-682-2112
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialALUMINUM
design_typeTHREADED
thread_class1B
overall_diameter0.438 INCHES NOMINAL IN
surface_treatmentANODIZE
inside_diameter_length0.563 INCHES NOMINAL IN
round_cap_outside_surface_conditionSERRATED
thread_size_and_series/type_designator5/16-24 UNIFIED NATIONAL COARSE (UNC)
NSN5340-00-682-2112
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS817-2 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: 0.438 INCHES NOMINAL IN
•
THREAD CLASS: 1B
•
ROUND CAP OUTSIDE SURFACE CONDITION: SERRATED
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 5/16-24 UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: ANODIZE
•
DESIGN TYPE: THREADED
•
MATERIAL: ALUMINUM
•
INSIDE DIAMETER LENGTH: 0.563 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.438 INCHES NOMINAL IN
THREAD CLASS1B
ROUND CAP OUTSIDE SURFACE CONDITIONSERRATED
THREAD SIZE AND SERIES/TYPE DESIGNATOR5/16-24 UNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTANODIZE
DESIGN TYPETHREADED
MATERIALALUMINUM
INSIDE DIAMETER LENGTH0.563 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
252143Upgraded Successor
successor cross-reference
successor
YC6-2SUpgraded Successor
successor cross-reference
successor
C2Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS817-2?
NAS817-2 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace NAS817-2?
There are 3 known substitutes for NAS817-2: 252143, YC6-2S, C2. Substitute compatibility should be verified for your specific system.
Is NAS817-2 still available?
NAS817-2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026