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PartsTable / COMPONENT / MS51520B6
MS51520B6 ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 12L14 AND STEEL COMP 1010 OVERALL, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS SECOND END, connection_style: FLARED W/ GASKET SEAL (BOSS) SECOND END, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-623-9137, 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
MS51520B6
NSN: 4730-00-623-9137
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 12L14 AND STEEL COMP 1010 OVERALL
seat_angle37.0 DEGREES FIRST END
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS SECOND END
connection_styleFLARED W/ GASKET SEAL (BOSS) SECOND END
surface_treatmentZINC OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.562 INCHES CENTER BULKHEAD IN
maximum_operating_temp400.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length2.180 INCHES IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorUNF CENTER BULKHEAD
NSN4730-00-623-9137
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51520B6 · 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 CLASS: 2A CENTER BULKHEAD A
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
NOMINAL OVERALL LENGTH: 2.220 INCHES IN
•
CONNECTION STYLE: FLARED W/ GASKET SEAL (BOSS) SECOND END
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A CENTER BULKHEAD A
END ITEM IDENTIFICATIONNSN 2320-01-304-2277 PLS (PALLETIZED LOADING SYSTEM); FIREFIGHTING TRUCK
THREAD CLASS2A ALL ENDS A
CRITICALITY CODE JUSTIFICATIONFEAT
NOMINAL OVERALL LENGTH2.220 INCHES IN
CONNECTION STYLEFLARED W/ GASKET SEAL (BOSS) SECOND END
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
THREAD SERIES DESIGNATORUNF CENTER BULKHEAD
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
1002552-02Interchangeable
interchangeable cross-reference
interchangeable
16447Interchangeable
interchangeable cross-reference
interchangeable
6-37-104Interchangeable
interchangeable cross-reference
interchangeable
GWTX-WLN-SInterchangeable
Same NIIN cross-reference
interchangeable
2041-6-6SInterchangeable
Same NIIN cross-reference
interchangeable
6-6070601CAInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51520B6?
MS51520B6 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51520B6?
There are 10 known substitutes for MS51520B6: 1002552-02, 16447, 6-37-104 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51520B6?
MS51520B6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-623-9137. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026