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Technical Data Sheet
PartsTable / COMPONENT / 11240409-1
11240409-1 ✓ 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 NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 1.120 INCHES NOMINAL IN, seat_angle: 37.0 DEGREES NOMINAL, thread_class: 2B, thread_series: UN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-947-2975, 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
11240409-1
NSN: 4730-00-947-2975
FSC: 4730
CAGE: 17773 — BALLISTIC MISSILE DEFENSE SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height1.120 INCHES NOMINAL IN
seat_angle37.0 DEGREES NOMINAL
thread_class2B
thread_seriesUN
thread_directionRIGHT-HAND
fabrication_methodMACHINED
length_to_shoulder0.960 INCHES NOMINAL IN
width_across_flats1.500 INCHES NOMINAL IN
nominal_thread_size1.312 INCHES IN
smallest_inside_diameter1.089 INCHES NOMINAL IN
NSN4730-00-947-2975
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 11240409-1 · 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
•
SMALLEST INSIDE DIAMETER: 1.089 INCHES NOMINAL IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 1.000 INCHES IN
•
NONDEFINITIVE SPEC/STD DATA: 15 FIGURE
•
SPECIFICATION/STANDARD DATA: 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
FABRICATION METHOD: MACHINED
•
NUT STYLE: TUBE COUPLING
•
NOMINAL THREAD SIZE: 1.312 INCHES IN
•
LENGTH TO SHOULDER: 0.960 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SMALLEST INSIDE DIAMETER1.089 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER1.000 INCHES IN
NONDEFINITIVE SPEC/STD DATA15 FIGURE
SPECIFICATION/STANDARD DATA81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
FABRICATION METHODMACHINED
NUT STYLETUBE COUPLING
NOMINAL THREAD SIZE1.312 INCHES IN
LENGTH TO SHOULDER0.960 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH12
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
11240409-5Interchangeable
interchangeable cross-reference
interchangeable
3-2149-7Interchangeable
interchangeable cross-reference
interchangeable
A318Interchangeable
interchangeable cross-reference
interchangeable
AN818-20JInterchangeable
interchangeable cross-reference
interchangeable
GN10FA-20Interchangeable
interchangeable cross-reference
interchangeable
811BT5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 11240409-1?
11240409-1 is a NUT,TUBE COUPLING.
What parts can replace 11240409-1?
There are 28 known substitutes for 11240409-1: 11240409-5, 3-2149-7, A318 and 25 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 11240409-1?
11240409-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-947-2975. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026