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Technical Data Sheet
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1790039 ✓ 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 REDUCER,PIPE is a the manufacturer industrial component. Key specifications include reducer_type: CONCENTRIC, end_item_identification: NSN 4930-01-365-5725-LUBRICATING AND SERVICING UNIT,POWER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-483-1961, 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
1790039
NSN: 4730-01-483-1961
FSC: 4730
CAGE: 0BGA6 — PORTER MANUFACTURING, L.L.C. DBA PORTER MANUFACTURING CORP (USA)
SPECIFICATIONS
reducer_typeCONCENTRIC
end_item_identificationNSN 4930-01-365-5725-LUBRICATING AND SERVICING UNIT,POWER
NSN4730-01-483-1961
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1790039 · 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
•
REDUCER TYPE: CONCENTRIC
TECHNICAL CHARACTERISTICS (FLIS)
REDUCER TYPECONCENTRIC
END ITEM IDENTIFICATIONNSN 4930-01-365-5725-LUBRICATING AND SERVICING UNIT,POWER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
437-60Interchangeable
interchangeable cross-reference
interchangeable
437-6Interchangeable
interchangeable cross-reference
interchangeable
49232700Interchangeable
interchangeable cross-reference
interchangeable
4879K13Interchangeable
interchangeable cross-reference
interchangeable
10503177Interchangeable
interchangeable cross-reference
interchangeable
LL-H36-8345Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1790039?
1790039 is a REDUCER,PIPE.
What parts can replace 1790039?
There are 6 known substitutes for 1790039: 437-60, 437-6, 49232700 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1790039?
1790039 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-483-1961. 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