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PartsTable / COMPONENT / NAS818-4
NAS818-4 ✓ 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

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: ALUMINUM ALLOY 3003, drive_type: SERRATED, design_type: THREADED, thread_class: 2A A, overall_diameter: 0.580 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN, special_features: SHOULDER 0.220 IN. MIN THK; THD 0.430 IN.

MIN 0.510 IN. MAX LG IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-597-9433, 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
NAS818-4
NSN: 5340-00-597-9433
FSC: 5340
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialALUMINUM ALLOY 3003
drive_typeSERRATED
design_typeTHREADED
thread_class2A A
overall_diameter0.580 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
special_featuresSHOULDER 0.220 IN. MIN THK; THD 0.430 IN. MIN 0.510 IN. MAX LG IN
features_providedSHOULDER
nondefinitive_spec/std_data3 TYPE AND 4 SIZE
material_document_and_classificationQQ-A-250/2, 0 FED SPEC SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator0.4375-20 UNF
NSN5340-00-597-9433
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS818-4 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
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND 4 SIZE
•
MATERIAL DOCUMENT AND CLASSIFICATION: L-P-390, TYPE 1, CLASS L FED SPEC SINGLE MATERIAL RESPONSE
•
DESIGN TYPE: THREADED
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 7/16-20 UNF
•
OVERALL DIAMETER: 0.875 INCHES NOMINAL IN
•
FEATURES PROVIDED: SHOULDER
•
THREAD CLASS: 3A A
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATA3 TYPE AND 4 SIZE
MATERIAL DOCUMENT AND CLASSIFICATIONL-P-390, TYPE 1, CLASS L FED SPEC SINGLE MATERIAL RESPONSE
DESIGN TYPETHREADED
THREAD SIZE AND SERIES/TYPE DESIGNATOR7/16-20 UNF
OVERALL DIAMETER0.875 INCHES NOMINAL IN
FEATURES PROVIDEDSHOULDER
THREAD CLASS3A A
MATERIALPLASTIC, POLYETHYLENE (PP)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
M5501/1-R6Upgraded Successor
successor cross-reference
successor
MILC5501Upgraded Successor
successor cross-reference
successor
MIL-C-5501/1Upgraded Successor
successor cross-reference
successor
M5501/1-R8Upgraded Successor
successor cross-reference
successor
PD60Upgraded Successor
successor cross-reference
successor
25726009-04Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS818-4?
NAS818-4 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace NAS818-4?
There are 22 known substitutes for NAS818-4: M5501/1-R6, MILC5501, MIL-C-5501/1 and 19 more. Substitute compatibility should be verified for your specific system.
Is NAS818-4 still available?
NAS818-4 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