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Technical Data Sheet
PartsTable / COMPONENT / MS51873-57B
MS51873-57B ✓ 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 NIPPLE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, connection_type: THREADED EXTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: LONG, surface_treatment: OXIDE OVERALL, nominal_thread_size: 0.375 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-094-3306, 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
MS51873-57B
NSN: 4730-01-094-3306
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
connection_typeTHREADED EXTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorLONG
surface_treatmentOXIDE OVERALL
nominal_thread_size0.375 INCHES ALL ENDS IN
nominal_overall_length3.000 INCHES IN
thread_series_designatorNPT ALL ENDS
nondefinitive_spec/std_data3 TYPE AND EXTRA-STRONG WEIGHT
specification/standard_data81348-WW-N-351 GOVERNMENT SPECIFICATION AND 96906-MS51873 GOVERNMENT STANDARD
NSN4730-01-094-3306
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51873-57B · 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
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND EXTRA-STRONG WEIGHT
•
NOMINAL OVERALL LENGTH: 3.000 INCHES IN
•
STYLE DESIGNATOR: LONG
•
NOMINAL THREAD SIZE: 0.375 INCHES ALL ENDS IN
•
CONNECTION TYPE: THREADED EXTERNAL PIPE ALL ENDS
•
MATERIAL: STEEL OVERALL
•
SPECIFICATION/STANDARD DATA: 81348-WW-N-351 GOVERNMENT SPECIFICATION AND 96906-MS51873 GOVERNMENT STANDARD
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATA3 TYPE AND EXTRA-STRONG WEIGHT
NOMINAL OVERALL LENGTH3.000 INCHES IN
STYLE DESIGNATORLONG
NOMINAL THREAD SIZE0.375 INCHES ALL ENDS IN
CONNECTION TYPETHREADED EXTERNAL PIPE ALL ENDS
MATERIALSTEEL OVERALL
SPECIFICATION/STANDARD DATA81348-WW-N-351 GOVERNMENT SPECIFICATION AND 96906-MS51873 GOVERNMENT STANDARD
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
SURFACE TREATMENTOXIDE OVERALL
THREAD SERIES DESIGNATORNPT ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
WW-N-351 TY3WTEXTRA-STRONGInterchangeable
interchangeable cross-reference
interchangeable
A733S-199CFBInterchangeable
interchangeable cross-reference
interchangeable
ASTM-A733Interchangeable
interchangeable cross-reference
interchangeable
WWN351TYPE2Interchangeable
interchangeable cross-reference
interchangeable
WW-N-351Interchangeable
interchangeable cross-reference
interchangeable
MS51873-108BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51873-57B?
MS51873-57B is a NIPPLE,PIPE.
What parts can replace MS51873-57B?
There are 16 known substitutes for MS51873-57B: WW-N-351 TY3WTEXTRA-STRONG, A733S-199CFB, ASTM-A733 and 13 more. Substitute compatibility should be verified for your specific system.
Is MS51873-57B still available?
MS51873-57B 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