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323-54A ✓ 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: PLASTIC, drive_type: SCREW SLOT, design_type: THREADED, thread_class: 3A A, overall_diameter: 0.813 INCHES NOMINAL IN, features_provided: SHOULDER. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7234, 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
323-54A
NSN: 5340-00-290-7234
FSC: 5340
CAGE: 56705 — DONALLCO INC (USA)
SPECIFICATIONS
materialPLASTIC
drive_typeSCREW SLOT
design_typeTHREADED
thread_class3A A
overall_diameter0.813 INCHES NOMINAL IN
features_providedSHOULDER
thread_size_and_series/type_designator9/16-18 UNF
NSN5340-00-290-7234
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 323-54A 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
•
FEATURES PROVIDED: SHOULDER
•
THREAD CLASS: 3A A
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 9/16-18 UNF
•
DRIVE TYPE: SCREW SLOT
•
DESIGN TYPE: THREADED
•
MATERIAL: PLASTIC
•
OVERALL DIAMETER: 0.813 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDSHOULDER
THREAD CLASS3A A
THREAD SIZE AND SERIES/TYPE DESIGNATOR9/16-18 UNF
DRIVE TYPESCREW SLOT
DESIGN TYPETHREADED
MATERIALPLASTIC
OVERALL DIAMETER0.813 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
MILC52078Upgraded Successor
successor cross-reference
successor
RU51089Upgraded Successor
successor cross-reference
successor
28901-17Upgraded Successor
successor cross-reference
successor
21Upgraded Successor
successor cross-reference
successor
MIL-C-5501Upgraded Successor
successor cross-reference
successor
57AUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 323-54A?
323-54A is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace 323-54A?
There are 29 known substitutes for 323-54A: MILC52078, RU51089, 28901-17 and 26 more. Substitute compatibility should be verified for your specific system.
Is 323-54A still available?
323-54A 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