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D28812 — TRANSFORMER,AUDIO FREQUENCY

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

D28812: TRANSFORMER,AUDIO FREQUENCY.

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, leg_length: 0.391 INCHES NOMINAL SECOND END IN, seat_angle: 42.0 DEGREES THIRD END, thread_class: 2B ALL ENDS, connection_type: THREADED INTERNAL TUBE SECOND END, connection_style: INVERTED FLARE (TUBE) THIRD END. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-289-5441, 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
D28812
NSN: 4730-00-289-5441
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
leg_length0.391 INCHES NOMINAL SECOND END IN
seat_angle42.0 DEGREES THIRD END
thread_class2B ALL ENDS
connection_typeTHREADED INTERNAL TUBE SECOND END
connection_styleINVERTED FLARE (TUBE) THIRD END
special_features1/8 IN.W BY 5/64 IN.DEEP GROOVE ON THIRD END LOCATED 5/32 IN.FROM END IN
nominal_thread_size0.438 INCHES FIRST END IN
thread_quantity_per_inch24 SECOND END
thread_series_designatorUNS FIRST END
nominal_outside_diameter_tube_accommodated0.438 INCHES ALL ENDS IN
NSN4730-00-289-5441
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: D28812 · 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: INVERTED FLARE (TUBE) FIRST END
•
CONNECTION TYPE: THREADED INTERNAL TUBE SECOND END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.438 INCHES ALL ENDS IN
•
LEG LENGTH: 0.391 INCHES NOMINAL SECOND END IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEINVERTED FLARE (TUBE) FIRST END
CONNECTION STYLEINVERTED FLARE (TUBE) THIRD END
CONNECTION STYLEINVERTED FLARE (TUBE) SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE THIRD END
CONNECTION TYPETHREADED INTERNAL TUBE FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.438 INCHES ALL ENDS IN
LEG LENGTH0.391 INCHES NOMINAL SECOND END IN
NOMINAL THREAD SIZE0.438 INCHES THIRD END IN
NOMINAL THREAD SIZE0.438 INCHES SECOND END IN
SUBSTITUTES & CROSS-REFERENCES 8
138K1Reference document
Same NSN cross-reference
Reference document — Secondary reference
497756Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
7734Reference document
Same NSN cross-reference
Reference document — Secondary reference
F4174Reference document
Same NSN cross-reference
Reference document — Secondary reference
2017608Reference document
Same NSN cross-reference
Reference document — Secondary reference
FC4187HReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D28812?
D28812 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace D28812?
There are 8 known substitutes for D28812: 138K1, 497756, 7734 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D28812?
D28812 is cataloged in the U.S. Government catalog under NSN 4730-00-289-5441. This indicates validated use in U.S. government and defense supply chains.
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