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Technical Data Sheet
PartsTable / COMPONENT / MS51525B4Z
MS51525B4Z ✓ 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 CORROSION RESISTING OVERALL, seat_angle: 37.0 DEGREES ALL ENDS, flange_shape: HEXAGON ALL ENDS, thread_class: 2A ALL ENDS A, connection_type: THREADED INTERNAL TUBE ALL ENDS, connection_style: SWIVEL NUT W/ COMPRESSION SLEEVE (TUBE) ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-460-3929, 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
MS51525B4Z
NSN: 4730-01-460-3929
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
seat_angle37.0 DEGREES ALL ENDS
flange_shapeHEXAGON ALL ENDS
thread_class2A ALL ENDS A
connection_typeTHREADED INTERNAL TUBE ALL ENDS
connection_styleSWIVEL NUT W/ COMPRESSION SLEEVE (TUBE) ALL ENDS
nominal_thickness0.172 INCHES ALL ENDS IN
surface_treatmentZINC OVERALL
nominal_thread_size0.438 INCHES ALL ENDS IN
nominal_overall_length1.230 INCHES IN
thread_pitch_diameters+0.3500 TO 0.3700 INCHES ALL ENDS IN
thread_quantity_per_inch20 ALL ENDS
NSN4730-01-460-3929
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51525B4Z · 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 PITCH DIAMETERS: +0.3500 TO 0.3700 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
CONNECTION STYLE: SWIVEL NUT W/ COMPRESSION SLEEVE (TUBE) ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: MS51525 MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
NOMINAL OVERALL LENGTH: 1.230 INCHES IN
•
NOMINAL THICKNESS: 0.172 INCHES ALL ENDS IN
•
CONNECTION TYPE: THREADED INTERNAL TUBE ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
THREAD PITCH DIAMETERS+0.3500 TO 0.3700 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNF ALL ENDS
CONNECTION STYLESWIVEL NUT W/ COMPRESSION SLEEVE (TUBE) ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONMS51525 MIL SPEC ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
NOMINAL OVERALL LENGTH1.230 INCHES IN
NOMINAL THICKNESS0.172 INCHES ALL ENDS IN
CONNECTION TYPETHREADED INTERNAL TUBE ALL ENDS
FLANGE SHAPEHEXAGON ALL ENDS
THREAD QUANTITY PER INCH20 ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
C5315X6X8Interchangeable
interchangeable cross-reference
interchangeable
6-8F5BXSInterchangeable
interchangeable cross-reference
interchangeable
MS51525A6-8Interchangeable
interchangeable cross-reference
interchangeable
10-12F5X-SSInterchangeable
interchangeable cross-reference
interchangeable
MS51525B10-12Interchangeable
interchangeable cross-reference
interchangeable
10-12F5BXSSInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51525B4Z?
MS51525B4Z is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51525B4Z?
There are 16 known substitutes for MS51525B4Z: C5315X6X8, 6-8F5BXS, MS51525A6-8 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51525B4Z?
MS51525B4Z is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-460-3929. 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