PartsTable
Technical Data Sheet
PartsTable / COMPONENT / B9243A1
B9243A1 ✓ 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: 1/2-20, thread_class: 2A A, overall_length: 0.641 INCHES NOMINAL IN, special_features: FURNISHED W/BRASS COMPRESSION SLEEVE PRESS FIT IN NUT, style_designator: INVERTED NUT, TUBE, FLARE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-374-8144, 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
B9243A1
NSN: 4730-00-374-8144
FSC: 4730
CAGE: 57526 — FORD MOTOR COMPANY (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thread_size1/2-20
thread_class2A A
overall_length0.641 INCHES NOMINAL IN
special_featuresFURNISHED W/BRASS COMPRESSION SLEEVE PRESS FIT IN NUT
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
fabrication_methodBAR STOCK, MACHINED
width_across_flats0.500 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
screw_thread_series_designatorUNF
NSN4730-00-374-8144
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B9243A1 · 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
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
SCREW THREAD SERIES DESIGNATOR: UNF
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
SMALLEST INSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
CASEHARDENING INDICATORNOT CASEHARDENED
SCREW THREAD SERIES DESIGNATORUNF
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
SPECIAL FEATURESFURNISHED W/BRASS COMPRESSION SLEEVE PRESS FIT IN NUT
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
SMALLEST INSIDE DIAMETER0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY
THREAD DIRECTIONRIGHT-HAND
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
FABRICATION METHODBAR STOCK, MACHINED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
B0-29052-1Interchangeable
interchangeable cross-reference
interchangeable
503570Interchangeable
interchangeable cross-reference
interchangeable
504396Interchangeable
interchangeable cross-reference
interchangeable
11907Interchangeable
interchangeable cross-reference
interchangeable
215993Interchangeable
interchangeable cross-reference
interchangeable
BB-9225Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy B9243A1?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is B9243A1?
B9243A1 is a INVERTED NUT,TUBE COUPLING.
What parts can replace B9243A1?
There are 12 known substitutes for B9243A1: B0-29052-1, 503570, 504396 and 9 more. Substitute compatibility should be verified for your specific system.
Is B9243A1 still available?
B9243A1 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — B9243A1

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026