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AP2109T4 ✓ 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: STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 0.720 INCHES NOMINAL IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 3B, thread_series: UNF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-554-8015, 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
AP2109T4
NSN: 4730-00-554-8015
FSC: 4730
CAGE: 01673 — SPS TECHNOLOGIES, LLC DBA AIRDROME PRECISION COMPONENTS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height0.720 INCHES NOMINAL IN
seat_angle45.00 DEGREES NOMINAL
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
length_to_shoulder0.537 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN
width_across_flats0.562 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
end_item_identification2350-01-031-0586
smallest_inside_diameter0.300 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN
NSN4730-00-554-8015
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AP2109T4 · 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
•
NUT HEIGHT: 0.720 INCHES NOMINAL IN
•
NUT STYLE: TUBE COUPLING
•
LENGTH TO SHOULDER: 0.537 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.562 INCHES NOMINAL IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.720 INCHES NOMINAL IN
NUT STYLETUBE COUPLING
LENGTH TO SHOULDER0.537 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.562 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
SEAT ANGLE45.00 DEGREES NOMINAL
END ITEM IDENTIFICATION2350-01-031-0586
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.438 INCHES IN
THREAD QUANTITY PER INCH20
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
SAE-AS18280Interchangeable
interchangeable cross-reference
interchangeable
MS21921W4Interchangeable
interchangeable cross-reference
interchangeable
MS21921D4Interchangeable
interchangeable cross-reference
interchangeable
AS21921-4DInterchangeable
interchangeable cross-reference
interchangeable
AS18280Interchangeable
interchangeable cross-reference
interchangeable
MS21921-4DInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AP2109T4?
AP2109T4 is a NUT,TUBE COUPLING.
What parts can replace AP2109T4?
There are 10 known substitutes for AP2109T4: SAE-AS18280, MS21921W4, MS21921D4 and 7 more. Substitute compatibility should be verified for your specific system.
Is AP2109T4 still available?
AP2109T4 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