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PartsTable / COMPONENT / 1604-181
1604-181 ✓ 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: PLASTIC, design_type: THREADED, overall_diameter: 0.938 INCHES NOMINAL IN, inside_diameter_length: 0.438 INCHES NOMINAL IN, round_cap_outside_surface_condition: RIBBED, thread_size_and_series/type_designator: 3/4-16 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 5340-00-297-2406, 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
1604-181
NSN: 5340-00-297-2406
FSC: 5340
CAGE: 79555 — PENNWALT CORP S S WHITE DIV (USA)
SPECIFICATIONS
materialPLASTIC
design_typeTHREADED
overall_diameter0.938 INCHES NOMINAL IN
inside_diameter_length0.438 INCHES NOMINAL IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator3/4-16 UNF
NSN5340-00-297-2406
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1604-181 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: 3/4-16 UNF
•
MATERIAL: PLASTIC
•
OVERALL DIAMETER: 0.938 INCHES NOMINAL IN
•
INSIDE DIAMETER LENGTH: 0.438 INCHES NOMINAL IN
•
DESIGN TYPE: THREADED
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/4-16 UNF
MATERIALPLASTIC
OVERALL DIAMETER0.938 INCHES NOMINAL IN
INSIDE DIAMETER LENGTH0.438 INCHES NOMINAL IN
DESIGN TYPETHREADED
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
5309Interchangeable
interchangeable cross-reference
interchangeable
5309FInterchangeable
interchangeable cross-reference
interchangeable
4B4728Interchangeable
interchangeable cross-reference
interchangeable
M181Interchangeable
interchangeable cross-reference
interchangeable
SAE-J512Interchangeable
interchangeable cross-reference
interchangeable
453B120Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1604-181?
1604-181 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 1604-181?
There are 11 known substitutes for 1604-181: 5309, 5309F, 4B4728 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1604-181?
1604-181 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-297-2406. 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