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74A586543 — ADAPTER,STRAIGHT,FLANGE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

74A586543: ADAPTER,STRAIGHT,FLANGE TO BOSS.

ADAPTER,STRAIGHT,FLANGE TO BOSS. Key specifications include material: ALUMINUM OVERALL, flange_shape: RECTANGULAR FIRST END, thread_class: 3B AND 3A SECOND END A, nominal_width: 1.250 INCHES FIRST END IN, nominal_length: 1.250 INCHES FIRST END IN, connection_type: FLANGE FIRST END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-348-4317, 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
74A586543
NSN: 4730-01-348-4317
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM OVERALL
flange_shapeRECTANGULAR FIRST END
thread_class3B AND 3A SECOND END A
nominal_width1.250 INCHES FIRST END IN
nominal_length1.250 INCHES FIRST END IN
connection_typeFLANGE FIRST END
nominal_thickness0.200 INCHES FIRST END IN
flange_face_designPLAIN FIRST END
nominal_thread_size0.435 INCHES AND 0.375 INCHES SECOND END IN
nominal_overall_length1.250 INCHES IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) SECOND END
NSN4730-01-348-4317
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 74A586543 · 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
•
FLANGE SHAPE: RECTANGULAR FIRST END
•
FLANGE FACE DESIGN: PLAIN FIRST END
•
NOMINAL LENGTH: 1.250 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 1.250 INCHES IN
•
CONNECTION TYPE: FLANGE FIRST END
•
NOMINAL THREAD SIZE: 0.435 INCHES AND 0.375 INCHES SECOND END IN
•
NOMINAL WIDTH: 1.250 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FLANGE SHAPERECTANGULAR FIRST END
FLANGE FACE DESIGNPLAIN FIRST END
NOMINAL LENGTH1.250 INCHES FIRST END IN
NOMINAL OVERALL LENGTH1.250 INCHES IN
CONNECTION TYPEFLANGE FIRST END
CONNECTION TYPETHREADED INTERNAL BOSS AND THREADED EXTERNAL BOSS SECOND END
NOMINAL THREAD SIZE0.435 INCHES AND 0.375 INCHES SECOND END IN
NOMINAL WIDTH1.250 INCHES FIRST END IN
THREAD CLASS3B AND 3A SECOND END A
MATERIALALUMINUM OVERALL
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 2
10109059Reference document
Same NSN cross-reference
Reference document — Informative reference only
74A586543-2003Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74A586543?
74A586543 is a ADAPTER,STRAIGHT,FLANGE TO BOSS.
What parts can replace 74A586543?
There are 2 known substitutes for 74A586543: 10109059, 74A586543-2003. Substitute compatibility should be verified for your specific system.
What is the NSN for 74A586543?
74A586543 is cataloged in the U.S. Government catalog under NSN 4730-01-348-4317. 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.