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Technical Data Sheet
PartsTable / COMPONENT / MS51825-6B
MS51825-6B ✓ Verified by PartsTable
— · 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 SLEEVE,CLINCH,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1213 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 12L14, flange_width: 0.116 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN, overall_length: 0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN, style_designator: FLARELESS, seat_angle_in_deg: 40.0, surface_treatment: CADMIUM AND CHROMATE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-463-0686, 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
MS51825-6B
NSN: 4730-00-463-0686
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 1213 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 12L14
flange_width0.116 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
overall_length0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
style_designatorFLARELESS
seat_angle_in_deg40.0
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
end_item_identificationU7M HOWITZER, MEDIUM, TOWED, 155MM (19M APR83) (M198) MM
flange_outside_diameter0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
sleeve_outside_diameter0.584 INCHES MINIMUM AND 0.587 INCHES MAXIMUM IN
specification/standard_data96906-MS51825 GOVERNMENT STANDARD
material_document_and_classificationFED STD 66, COMP 1118 FED STD 3RD MATERIAL RESPONSE OR FED STD 66, COMP 1137 FED STD 4TH MATERIAL RESPONSE OR FED STD 66, COMP 12L14 FED STD 5TH MATERIAL RESPONSE
NSN4730-00-463-0686
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51825-6B · 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
•
FLANGE WIDTH: 0.116 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
•
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.500 INCHES NOMINAL IN
•
FLANGE OUTSIDE DIAMETER: 0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
SLEEVE OUTSIDE DIAMETER: 0.584 INCHES MINIMUM AND 0.587 INCHES MAXIMUM IN
•
SEAT ANGLE IN DEG: 40.0
•
MATERIAL: STEEL COMP 1213 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 12L14
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
FLANGE WIDTH0.116 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.500 INCHES NOMINAL IN
FLANGE OUTSIDE DIAMETER0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
SLEEVE OUTSIDE DIAMETER0.584 INCHES MINIMUM AND 0.587 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONU7M HOWITZER, MEDIUM, TOWED, 155MM (19M APR83) (M198) MM
SEAT ANGLE IN DEG40.0
MATERIALSTEEL COMP 1213 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 12L14
CASEHARDENING INDICATORNOT CASEHARDENED
SURFACE TREATMENTCADMIUM AND CHROMATE
SPECIFICATION/STANDARD DATA96906-MS51825 GOVERNMENT STANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
12220Interchangeable
interchangeable cross-reference
interchangeable
2012-T 20Interchangeable
interchangeable cross-reference
interchangeable
150 20Interchangeable
interchangeable cross-reference
interchangeable
20047Interchangeable
interchangeable cross-reference
interchangeable
110 47/64Interchangeable
interchangeable cross-reference
interchangeable
53147Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51825-6B?
MS51825-6B is a SLEEVE,CLINCH,TUBE FITTING.
What parts can replace MS51825-6B?
There are 22 known substitutes for MS51825-6B: 12220, 2012-T 20, 150 20 and 19 more. Substitute compatibility should be verified for your specific system.
Is MS51825-6B still available?
MS51825-6B 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: July 2026