PartsTable
Technical Data Sheet
U4-4 ✓ Verified by PartsTable
· HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The SEMICONDUCTOR DEVICE,DIODE is a the manufacturer industrial component. Key specifications include material: SILICON SEMICONDUCTOR, seat_angle: 45.0 DEGREES ALL ENDS, thread_class: 2B ALL ENDS, overall_length: 0.540 INCHES MAXIMUM IN, connection_type: THREADED INTERNAL TUBE ALL ENDS, mounting_method: TERMINAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-702-6596, 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
U4-4
NSN: 4730-00-702-6596
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialSILICON SEMICONDUCTOR
seat_angle45.0 DEGREES ALL ENDS
thread_class2B ALL ENDS
overall_length0.540 INCHES MAXIMUM IN
connection_typeTHREADED INTERNAL TUBE ALL ENDS
mounting_methodTERMINAL
terminal_length1.000 INCHES MINIMUM IN
connection_styleFLARED (TUBE) ALL ENDS
overall_diameter0.380 INCHES MAXIMUM IN
style_designatorRIGID, LONG CENTER WRENCHING FACILITY
features_providedHERMETICALLY SEALED CASE
surface_treatmentZINC OVERALL
NSN4730-00-702-6596
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: U4-4 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
MATERIAL: COPPER ALLOY OR STEEL OR IRON OVERALL
SPECIFICATION/STANDARD DATA: 81343 J513 FIGURE 8 NATIONAL STD/SPEC
FURNISHED ITEMS AND QUANTITY: 2 FLAT WASHER
SURFACE TREATMENT: ZINC OVERALL
THREAD SERIES DESIGNATOR: UNF ALL ENDS
CONNECTION TYPE: THREADED INTERNAL TUBE ALL ENDS
SEAT ANGLE: 45.0 DEGREES ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEFLARED (TUBE) ALL ENDS
MATERIALCOPPER ALLOY OR STEEL OR IRON OVERALL
SPECIFICATION/STANDARD DATA81343 J513 FIGURE 8 NATIONAL STD/SPEC
FURNISHED ITEMS AND QUANTITY2 FLAT WASHER
SURFACE TREATMENTZINC OVERALL
THREAD SERIES DESIGNATORUNF ALL ENDS
CONNECTION TYPETHREADED INTERNAL TUBE ALL ENDS
SEAT ANGLE45.0 DEGREES ALL ENDS
NOMINAL OVERALL LENGTH1.000 INCHES IN
STYLE DESIGNATORRIGID, LONG CENTER WRENCHING FACILITY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
44814Interchangeable
interchangeable cross-reference
interchangeable
DM-651Interchangeable
interchangeable cross-reference
interchangeable
A-385Interchangeable
interchangeable cross-reference
interchangeable
91ELD0001Interchangeable
interchangeable cross-reference
interchangeable
A-603-15647Interchangeable
interchangeable cross-reference
interchangeable
2052763Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is U4-4?
U4-4 is a SEMICONDUCTOR DEVICE,DIODE.
What parts can replace U4-4?
There are 21 known substitutes for U4-4: 44814, DM-651, A-385 and 18 more. Substitute compatibility should be verified for your specific system.
Is U4-4 still available?
U4-4 is currently cancelled.
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