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PartsTable / COMPONENT / MS51873-97
MS51873-97 ✓ 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

OVEN,ELECTRICAL-ELECTRONIC COMPO. Key specifications include material: STEEL OVERALL, leg_length: 0.370 INCHES NOMINAL ALL ENDS IN, connection_type: THREADED EXTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: CLOSE, surface_treatment: ZINC OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-3560, 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
MS51873-97
NSN: 4730-00-278-3560
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
leg_length0.370 INCHES NOMINAL ALL ENDS IN
connection_typeTHREADED EXTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorCLOSE
surface_treatmentZINC OVERALL
nominal_thread_size0.750 INCHES ALL ENDS IN
nominal_overall_length1.375 INCHES IN
thread_series_designatorNPT ALL ENDS
specification/standard_data81346-ASTM A733 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51873 GOVERNMENT STANDARD
material_document_and_classificationASTM A120 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-278-3560
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51873-97 · 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 SERIES DESIGNATOR: NPT ALL ENDS
•
SURFACE TREATMENT: ZINC OVERALL
•
SPECIFICATION/STANDARD DATA: 81346-ASTM A733 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51873 GOVERNMENT STANDARD
•
LEG LENGTH: 0.370 INCHES NOMINAL ALL ENDS IN
•
CONNECTION TYPE: THREADED EXTERNAL PIPE ALL ENDS
•
NOMINAL THREAD SIZE: 0.750 INCHES ALL ENDS IN
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
STYLE DESIGNATOR: CLOSE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORNPT ALL ENDS
SURFACE TREATMENTZINC OVERALL
SPECIFICATION/STANDARD DATA81346-ASTM A733 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51873 GOVERNMENT STANDARD
LEG LENGTH0.370 INCHES NOMINAL ALL ENDS IN
CONNECTION TYPETHREADED EXTERNAL PIPE ALL ENDS
NOMINAL THREAD SIZE0.750 INCHES ALL ENDS IN
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
STYLE DESIGNATORCLOSE
NOMINAL OVERALL LENGTH1.375 INCHES IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
E59-0003-003Interchangeable
interchangeable cross-reference
interchangeable
11206Interchangeable
interchangeable cross-reference
interchangeable
A48298-87Interchangeable
interchangeable cross-reference
interchangeable
MS28741-5-0080Interchangeable
interchangeable cross-reference
interchangeable
78175Interchangeable
interchangeable cross-reference
interchangeable
2511Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51873-97?
MS51873-97 is a OVEN,ELECTRICAL-ELECTRONIC COMPO.
What parts can replace MS51873-97?
There are 29 known substitutes for MS51873-97: E59-0003-003, 11206, A48298-87 and 26 more. Substitute compatibility should be verified for your specific system.
Is MS51873-97 still available?
MS51873-97 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