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189939 — PRINTED CIRCUIT BOARD

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

189939: PRINTED CIRCUIT BOARD.

The PRINTED CIRCUIT BOARD is a the manufacturer industrial component. Key specifications include material: PLASTIC, design_type: THREADED, overall_diameter: 0.937 INCHES NOMINAL IN, inside_diameter_length: 0.500 INCHES NOMINAL IN, end_item_identification: 3431-01-498-4423, round_cap_outside_surface_condition: RIBBED. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-158-9418, 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
189939
NSN: 5340-00-158-9418
NIINs: 001589418, 015081072
FSC: 5340 — Hardware, Commercial
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialPLASTIC
design_typeTHREADED
overall_diameter0.937 INCHES NOMINAL IN
inside_diameter_length0.500 INCHES NOMINAL IN
end_item_identification3431-01-498-4423
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator3/4-20 UNEF
part_name_assigned_by_controlling_agencyCIRCUIT CARD PC7
tube_outside_diameter_for_which_designed0.562 INCHES NOMINAL IN
NSN5340-00-158-9418
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 189939 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
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 0.937 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.562 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/4-20 UNEF
•
INSIDE DIAMETER LENGTH: 0.500 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.937 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.562 INCHES NOMINAL IN
MATERIALPLASTIC
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/4-20 UNEF
INSIDE DIAMETER LENGTH0.500 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
SUBSTITUTES & CROSS-REFERENCES 2
194-507-9101Reference document
Same NSN cross-reference
Reference document — Secondary reference
1604-183YReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 189939?
189939 is a PRINTED CIRCUIT BOARD.
What parts can replace 189939?
There are 2 known substitutes for 189939: 194-507-9101, 1604-183Y. Substitute compatibility should be verified for your specific system.
What is the NSN for 189939?
189939 is cataloged in the U.S. Government catalog under NSN 5340-00-158-9418. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.