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PartsTable / COMPONENT / MS51531B10
MS51531B10 ✓ 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 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.970 INCHES NOMINAL IN, seat_angle: 37.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-897-2043, 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
MS51531B10
NSN: 4730-00-897-2043
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height0.970 INCHES NOMINAL IN
seat_angle37.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE OVERALL
width_across_flats1.000 INCHES NOMINAL IN
nominal_thread_size0.875 INCHES IN
smallest_inside_diameter0.698 INCHES NOMINAL IN
thread_quantity_per_inch16
NSN4730-00-897-2043
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51531B10 · 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: 2B
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 12L14 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD SIZE: 0.875 INCHES IN
•
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
•
NUT STYLE: TUBE COUPLING
•
SEAT ANGLE: 37.00 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
MATERIALSTEEL OVERALL
SURFACE TREATMENTPHOSPHATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 12L14 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD SIZE0.875 INCHES IN
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
NUT STYLETUBE COUPLING
SEAT ANGLE37.00 DEGREES NOMINAL
NUT HEIGHT0.970 INCHES NOMINAL IN
THREAD SERIESUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
A18-10Interchangeable
interchangeable cross-reference
interchangeable
A87Interchangeable
interchangeable cross-reference
interchangeable
2533406-4Interchangeable
interchangeable cross-reference
interchangeable
12-Z-7001-2426Interchangeable
interchangeable cross-reference
interchangeable
8G1390Interchangeable
interchangeable cross-reference
interchangeable
10BTXSInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51531B10?
MS51531B10 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51531B10?
There are 15 known substitutes for MS51531B10: A18-10, A87, 2533406-4 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51531B10?
MS51531B10 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-897-2043. 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