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641F1-4 — Technical Data Sheet

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— · 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 COIL,RADIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.937 INCHES NOMINAL IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-189-2729, 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
641F1-4
NSN: 4730-00-189-2729
FSC: 4730
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.937 INCHES NOMINAL IN
seat_angle45.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodFORGED
width_across_flats0.625 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
smallest_inside_diameter0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_quantity_per_inch20
NSN4730-00-189-2729
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 641F1-4 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
SMALLEST INSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES: UNF
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND
SMALLEST INSIDE DIAMETER0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.438 INCHES IN
SEAT ANGLE45.00 DEGREES NOMINAL
THREAD QUANTITY PER INCH20
THREAD SERIESUNF
SMALLEST INSIDE DIAMETER0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
NONDEFINITIVE SPEC/STD DATA36A FIGURE A
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
N4-11InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
N4-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
57A5A5-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A4-40InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
38382InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
E13074InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 641F1-4?
641F1-4 is a COIL,RADIO FREQUENCY.
What parts can replace 641F1-4?
There are 24 known substitutes for 641F1-4: N4-11, N4-4, 57A5A5-4 and 21 more. Substitute compatibility should be verified for your specific system.
Is 641F1-4 still available?
641F1-4 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: October 2026