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1660A — TRANSFORMER,RADIO FREQUENCY

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1660A: TRANSFORMER,RADIO FREQUENCY.

The TRANSFORMER,RADIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: STEEL, thickness: 0.250 INCHES NOMINAL IN, overall_length: 0.563 INCHES NOMINAL IN, width_across_flats: 0.750 INCHES NOMINAL IN, male_end_thread_size: 5/8-24, male_end_thread_class: 3A A. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-362-8420, 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
1660A
NSN: 4730-00-362-8420
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 1ML14 — BRINKLEY TECHNOLOGY GROUP LLC DBA HERCULES MANUFACTURING (USA)
SPECIFICATIONS
materialSTEEL
thickness0.250 INCHES NOMINAL IN
overall_length0.563 INCHES NOMINAL IN
width_across_flats0.750 INCHES NOMINAL IN
male_end_thread_size5/8-24
male_end_thread_class3A A
female_end_thread_size5/16-24
male_end_thread_length0.219 INCHES NOMINAL IN
female_end_thread_class2B
female_end_thread_length0.563 INCHES NOMINAL IN
wrenching_facility_shapeHEXAGON
male_end_thread_directionRIGHT-HAND
NSN4730-00-362-8420
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1660A · 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
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
MALE END THREAD SIZE: 5/8-24
•
FEMALE END THREAD LENGTH: 0.563 INCHES NOMINAL IN
•
FEMALE END THREAD CLASS: 2B
•
MALE END THREAD DIRECTION: RIGHT-HAND
•
FEMALE END THREAD SIZE: 5/16-24
•
WRENCHING FACILITY SHAPE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
MALE END THREAD SIZE5/8-24
FEMALE END THREAD LENGTH0.563 INCHES NOMINAL IN
FEMALE END THREAD CLASS2B
OVERALL LENGTH0.563 INCHES NOMINAL IN
MALE END THREAD DIRECTIONRIGHT-HAND
FEMALE END THREAD SIZE5/16-24
WRENCHING FACILITY SHAPEHEXAGON
MALE END SCREW THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FEMALE END SCREW THREAD SERIES DESIGNATORUNF
SUBSTITUTES & CROSS-REFERENCES 5
5163209Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1A9723Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
A163209Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
643503Reference document
Same NSN cross-reference
Reference document — Secondary reference
55199Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 1660A?
1660A is a TRANSFORMER,RADIO FREQUENCY.
What parts can replace 1660A?
There are 5 known substitutes for 1660A: 5163209, 1A9723, A163209 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1660A?
1660A is cataloged in the U.S. Government catalog under NSN 4730-00-362-8420. 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.