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Technical Data Sheet
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156D3 ✓ 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 TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.500 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5451, 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
156D3
NSN: 4730-00-278-5451
FSC: 4730
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.500 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
length_to_shoulder0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
width_across_flats0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
nominal_thread_size0.438 INCHES IN
smallest_inside_diameter0.316 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
thread_quantity_per_inch20
NSN4730-00-278-5451
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 156D3 · 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
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
THREAD SERIES: UNF
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626,CP 21 OR 22 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
WIDTH ACROSS FLATS: 0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
•
NUT HEIGHT: 0.500 INCHES NOMINAL IN
•
LENGTH TO SHOULDER: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
THREAD SERIESUNF
NOMINAL THREAD SIZE0.438 INCHES IN
MATERIALCOPPER ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626,CP 21 OR 22 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
WIDTH ACROSS FLATS0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
NUT HEIGHT0.500 INCHES NOMINAL IN
LENGTH TO SHOULDER0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH20
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
306-67-4MInterchangeable
interchangeable cross-reference
interchangeable
PC9F36GInterchangeable
interchangeable cross-reference
interchangeable
6191Interchangeable
interchangeable cross-reference
interchangeable
E10711Interchangeable
interchangeable cross-reference
interchangeable
5940PL1333504Interchangeable
interchangeable cross-reference
interchangeable
3522 500 22745Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 156D3?
156D3 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace 156D3?
There are 23 known substitutes for 156D3: 306-67-4M, PC9F36G, 6191 and 20 more. Substitute compatibility should be verified for your specific system.
Is 156D3 still available?
156D3 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