PartsTable
Technical Data Sheet
B3738 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thread_size: 5/16-24, thread_class: 2A A, overall_length: 0.469 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, FLARE, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-359-9013, 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
B3738
NSN: 4730-00-359-9013
FSC: 4730
CAGE: 70925 — BIJUR LUBRICATING CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thread_size5/16-24
thread_class2A A
overall_length0.469 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg45.00
width_across_flats0.375 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.156 INCHES NOMINAL IN
screw_thread_series_designatorUNF
tube_outside_diameter_for_which_designed0.156 INCHES NOMINAL IN
NSN4730-00-359-9013
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B3738 · 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
THREAD SIZE: 5/16-24
CASEHARDENING INDICATOR: NOT CASEHARDENED
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
SEAT ANGLE IN DEG: 45.00
MATERIAL: COPPER ALLOY
SCREW THREAD SERIES DESIGNATOR: UNF
SMALLEST INSIDE DIAMETER: 0.156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SIZE5/16-24
CASEHARDENING INDICATORNOT CASEHARDENED
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
SEAT ANGLE IN DEG45.00
MATERIALCOPPER ALLOY
SCREW THREAD SERIES DESIGNATORUNF
SMALLEST INSIDE DIAMETER0.156 INCHES NOMINAL IN
OVERALL LENGTH0.469 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
450188Interchangeable
interchangeable cross-reference
interchangeable
F4E-30-CCBC-03NMInterchangeable
interchangeable cross-reference
interchangeable
668959Interchangeable
interchangeable cross-reference
interchangeable
5906Interchangeable
interchangeable cross-reference
interchangeable
2095544Interchangeable
interchangeable cross-reference
interchangeable
12600954-017Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B3738?
B3738 is a INVERTED NUT,TUBE COUPLING.
What parts can replace B3738?
There are 15 known substitutes for B3738: 450188, F4E-30-CCBC-03NM, 668959 and 12 more. Substitute compatibility should be verified for your specific system.
Is B3738 still available?
B3738 is currently cancelled.
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