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U543723-1 — COUPLING,BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

U543723-1: COUPLING,BOSS.

The COUPLING,BOSS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061 OVERALL, thread_class: 3B ALL ENDS, connection_type: THREADED INTERNAL BOSS ALL ENDS, connection_style: GASKET SEAL (BOSS) ALL ENDS, special_features: USED IN FLUID SYSTEM, 3/4 INCH PASSAGE; HAS INLET IN SIDE FOR 1/8 INCH NPT IN, style_designator: PLAIN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-494-4573, 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
U543723-1
NSN: 4730-01-494-4573
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 78943 — TRIUMPH THERMAL SYSTEMS, LLC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
thread_class3B ALL ENDS
connection_typeTHREADED INTERNAL BOSS ALL ENDS
connection_styleGASKET SEAL (BOSS) ALL ENDS
special_featuresUSED IN FLUID SYSTEM, 3/4 INCH PASSAGE; HAS INLET IN SIDE FOR 1/8 INCH NPT IN
style_designatorPLAIN
nominal_thread_size1.0625 INCHES ALL ENDS IN
nominal_overall_length3.000 INCHES IN
end_item_identificationAIRCRAFT, B2
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT (UNJ) ALL ENDS
part_name_assigned_by_controlling_agencyPRESSURE TAP ADAPTER
NSN4730-01-494-4573
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: U543723-1 · 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
•
CONNECTION STYLE: GASKET SEAL (BOSS) ALL ENDS
•
NOMINAL OVERALL LENGTH: 3.000 INCHES IN
•
CONNECTION TYPE: THREADED INTERNAL BOSS ALL ENDS
•
STYLE DESIGNATOR: PLAIN
•
NOMINAL THREAD SIZE: 1.0625 INCHES ALL ENDS IN
•
THREAD CLASS: 3B ALL ENDS
TECHNICAL CHARACTERISTICS
CONNECTION STYLEGASKET SEAL (BOSS) ALL ENDS
NOMINAL OVERALL LENGTH3.000 INCHES IN
CONNECTION TYPETHREADED INTERNAL BOSS ALL ENDS
STYLE DESIGNATORPLAIN
NOMINAL THREAD SIZE1.0625 INCHES ALL ENDS IN
SPECIAL FEATURESUSED IN FLUID SYSTEM, 3/4 INCH PASSAGE; HAS INLET IN SIDE FOR 1/8 INCH NPT IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPRESSURE TAP ADAPTER
THREAD CLASS3B ALL ENDS
END ITEM IDENTIFICATIONAIRCRAFT, B2
THREAD QUANTITY PER INCH12 ALL ENDS
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
U543723Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is U543723-1?
U543723-1 is a COUPLING,BOSS.
What parts can replace U543723-1?
There is 1 known substitute for U543723-1: U543723. Substitute compatibility should be verified for your specific system.
What is the NSN for U543723-1?
U543723-1 is cataloged in the U.S. Government catalog under NSN 4730-01-494-4573. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.