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Technical Data Sheet
PartsTable / COMPONENT / NAS816-4
NAS816-4 ✓ 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-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: PLASTIC, length_under_shoulder: 0.813 INCHES NOMINAL IN, open_end_inside_diameter: 0.356 INCHES NOMINAL IN, closed_end_overall_diameter: 0.427 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-514-2777, 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
NAS816-4
NSN: 5340-00-514-2777
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialPLASTIC
length_under_shoulder0.813 INCHES NOMINAL IN
open_end_inside_diameter0.356 INCHES NOMINAL IN
closed_end_overall_diameter0.427 INCHES NOMINAL IN
NSN5340-00-514-2777
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS816-4 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
•
CLOSED END OVERALL DIAMETER: 0.427 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.813 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 0.356 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS (FLIS)
CLOSED END OVERALL DIAMETER0.427 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.813 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER0.356 INCHES NOMINAL IN
MATERIALPLASTIC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
10-644-8-2Upgraded Successor
successor cross-reference
successor
917955-7Upgraded Successor
successor cross-reference
successor
4Upgraded Successor
successor cross-reference
successor
WW4Interchangeable
interchangeable cross-reference
interchangeable
10117383Interchangeable
Same NIIN cross-reference
interchangeable
NAS816-42Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS816-4?
NAS816-4 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace NAS816-4?
There are 7 known substitutes for NAS816-4: 10-644-8-2, 917955-7, 4 and 4 more. Substitute compatibility should be verified for your specific system.
Is NAS816-4 still available?
NAS816-4 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