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41FS — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

41FS: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 377 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.690 INCHES NOMINAL IN, seat_angle: 45.0 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-189-2739, 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
41FS
NSN: 4730-00-189-2739
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30276 — PRIOR DON INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 377 OVERALL
nut_styleTUBE COUPLING
nut_height0.690 INCHES NOMINAL IN
seat_angle45.0 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodFORGED
length_to_shoulder0.500 INCHES NOMINAL IN
width_across_flats0.813 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
smallest_inside_diameter0.380 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
NSN4730-00-189-2739
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 41FS · 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
•
LENGTH TO SHOULDER: 0.500 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.813 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-611 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SEAT ANGLE: 45.0 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
SPECIFICATION/STANDARD DATA: 96906-MS35872 GOVERNMENT STANDARD AND 81343-J513 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.500 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.813 INCHES NOMINAL IN
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-611 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SEAT ANGLE45.0 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.625 INCHES IN
SPECIFICATION/STANDARD DATA96906-MS35872 GOVERNMENT STANDARD AND 81343-J513 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NONDEFINITIVE SPEC/STD DATA36A FIGURE A
NUT HEIGHT0.690 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 9
MS35872-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
L1173Reference document
Same NSN cross-reference
Reference document — Secondary reference
A5052Reference document
Same NSN cross-reference
Reference document — Secondary reference
BM11383-114Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-J513Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
060P04Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 41FS?
41FS is a NUT,TUBE COUPLING.
What parts can replace 41FS?
There are 9 known substitutes for 41FS: MS35872-3, L1173, A5052 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 41FS?
41FS is cataloged in the U.S. Government catalog under NSN 4730-00-189-2739. 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.