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Technical Data Sheet
PartsTable / COMPONENT / NAS817-3
NAS817-3 ✓ 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 design_type: THREADED, thread_class: 2B, overall_diameter: 0.406 INCHES NOMINAL IN, inside_diameter_length: 0.260 INCHES NOMINAL IN, round_cap_outside_surface_condition: KNURLED, thread_size_and_series/type_designator: 0.375-24 UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-158-1313, 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
NAS817-3
NSN: 5340-00-158-1313
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
design_typeTHREADED
thread_class2B
overall_diameter0.406 INCHES NOMINAL IN
inside_diameter_length0.260 INCHES NOMINAL IN
round_cap_outside_surface_conditionKNURLED
thread_size_and_series/type_designator0.375-24 UNF
NSN5340-00-158-1313
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS817-3 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
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.375-24 UNF
•
DESIGN TYPE: THREADED
•
THREAD CLASS: 2B
•
INSIDE DIAMETER LENGTH: 0.260 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.406 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: KNURLED
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.375-24 UNF
DESIGN TYPETHREADED
THREAD CLASS2B
INSIDE DIAMETER LENGTH0.260 INCHES NOMINAL IN
OVERALL DIAMETER0.406 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONKNURLED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
126HUpgraded Successor
successor cross-reference
successor
KC17Upgraded Successor
successor cross-reference
successor
SR4-136Upgraded Successor
successor cross-reference
successor
927Upgraded Successor
successor cross-reference
successor
TC-3Upgraded Successor
successor cross-reference
successor
C-3Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS817-3?
NAS817-3 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace NAS817-3?
There are 10 known substitutes for NAS817-3: 126H, KC17, SR4-136 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS817-3?
NAS817-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-158-1313. 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