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MS51823 — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS51823: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: TUBE COUPLING, nut_height: 0.703 INCHES NOMINAL IN, seat_angle: 40.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-800-4788, 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
MS51823
NSN: 4730-00-800-4788
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleTUBE COUPLING
nut_height0.703 INCHES NOMINAL IN
seat_angle40.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
special_featuresSUPPORTS 1025-01-026-6648;HOWITZER,MED. TOWED 155-MM,M198
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
length_to_shoulder0.537 INCHES NOMINAL IN
width_across_flats0.563 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
NSN4730-00-800-4788
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51823 · 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: 0.537 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.563 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
SEAT ANGLE: 40.00 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
SPECIFICATION/STANDARD DATA: 96906-MS51823 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NONDEFINITIVE SPEC/STD DATA: 31 FIGURE
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.537 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.563 INCHES NOMINAL IN
THREAD SERIESUNF
SEAT ANGLE40.00 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.438 INCHES IN
SPECIFICATION/STANDARD DATA96906-MS51823 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NONDEFINITIVE SPEC/STD DATA31 FIGURE
NUT HEIGHT0.703 INCHES NOMINAL IN
SPECIAL FEATURESSUPPORTS 1025-01-026-6648;HOWITZER,MED. TOWED 155-MM,M198
SUBSTITUTES & CROSS-REFERENCES 5
4BU-SSReference document
Same NSN cross-reference
Reference document — Secondary reference
400200-041Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS51823-3SSSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4730PL0959122Reference document
Same NSN cross-reference
Reference document — Informative reference only
MIL-DTL-18866Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS51823?
MS51823 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51823?
There are 5 known substitutes for MS51823: 4BU-SS, 400200-041, MS51823-3SS and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51823?
MS51823 is cataloged in the U.S. Government catalog under NSN 4730-00-800-4788. 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.