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Technical Data Sheet
PartsTable / COMPONENT / MS51533B4S
MS51533B4S ✓ 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,FLARED,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, flange_width: 0.140 INCHES NOMINAL IN, overall_length: 0.410 INCHES NOMINAL IN, style_designator: SLEEVE, seat_angle_in_deg: 33.0, surface_treatment: PASSIVATE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-629-0868, 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
MS51533B4S
NSN: 4730-00-629-0868
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
flange_width0.140 INCHES NOMINAL IN
overall_length0.410 INCHES NOMINAL IN
style_designatorSLEEVE
seat_angle_in_deg33.0
surface_treatmentPASSIVATE
casehardening_indicatorCASEHARDENED
flange_outside_diameter0.383 INCHES NOMINAL IN
sleeve_outside_diameter0.328 INCHES NOMINAL IN
metallic_hardness_rating70.0 MINIMUM ROCKWELL B AND 95.0 MAXIMUM ROCKWELL B
nondefinitive_spec/std_data14 FIGURE
specification/standard_data96906-MS51533 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN4730-00-629-0868
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51533B4S · 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
•
CASEHARDENING INDICATOR: CASEHARDENED
•
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE
•
STYLE DESIGNATOR: SLEEVE
•
MATERIAL: STEEL CORROSION RESISTING
•
SLEEVE OUTSIDE DIAMETER: 0.328 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 33.0
•
METALLIC HARDNESS RATING: 70.0 MINIMUM ROCKWELL B AND 95.0 MAXIMUM ROCKWELL B
TECHNICAL CHARACTERISTICS (FLIS)
CASEHARDENING INDICATORCASEHARDENED
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE
STYLE DESIGNATORSLEEVE
MATERIALSTEEL CORROSION RESISTING
SLEEVE OUTSIDE DIAMETER0.328 INCHES NOMINAL IN
SEAT ANGLE IN DEG33.0
METALLIC HARDNESS RATING70.0 MINIMUM ROCKWELL B AND 95.0 MAXIMUM ROCKWELL B
NONDEFINITIVE SPEC/STD DATA14 FIGURE
SPECIFICATION/STANDARD DATA96906-MS51533 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
10231305Interchangeable
interchangeable cross-reference
interchangeable
8194Interchangeable
interchangeable cross-reference
interchangeable
UU-J-390Interchangeable
interchangeable cross-reference
interchangeable
A-A-1964Interchangeable
interchangeable cross-reference
interchangeable
UU-J-390 ST3Interchangeable
interchangeable cross-reference
interchangeable
547823Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51533B4S?
MS51533B4S is a SLEEVE,FLARED,TUBE FITTING.
What parts can replace MS51533B4S?
There are 19 known substitutes for MS51533B4S: 10231305, 8194, UU-J-390 and 16 more. Substitute compatibility should be verified for your specific system.
Is MS51533B4S still available?
MS51533B4S 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