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B1900-5106 — REDUCER,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

B1900-5106: REDUCER,PIPE.

The REDUCER,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, reducer_type: CONCENTRIC, nominal_thread_size: 0.500 INCHES SECOND END IN, nominal_overall_length: 6.000 INCHES IN, end_item_identification: WATER DISTRIBUTION SYSTEMS., thread_series_designator: NPT SECOND END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-189-4604, 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
B1900-5106
NSN: 4730-01-189-4604
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 37562 — MACLEOD INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
reducer_typeCONCENTRIC
nominal_thread_size0.500 INCHES SECOND END IN
nominal_overall_length6.000 INCHES IN
end_item_identificationWATER DISTRIBUTION SYSTEMS.
thread_series_designatorNPT SECOND END
NSN4730-01-189-4604
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B1900-5106 · 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
•
NOMINAL OVERALL LENGTH: 6.000 INCHES IN
•
NOMINAL THREAD SIZE: 0.500 INCHES SECOND END IN
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES DESIGNATOR: NPT SECOND END
•
REDUCER TYPE: CONCENTRIC
TECHNICAL CHARACTERISTICS
NOMINAL OVERALL LENGTH6.000 INCHES IN
NOMINAL THREAD SIZE0.500 INCHES SECOND END IN
NOMINAL THREAD SIZE0.750 INCHES FIRST END IN
END ITEM IDENTIFICATIONWATER DISTRIBUTION SYSTEMS.
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORNPT SECOND END
THREAD SERIES DESIGNATORUNF FIRST END
REDUCER TYPECONCENTRIC
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B1900-5106?
B1900-5106 is a REDUCER,PIPE.
What is the NSN for B1900-5106?
B1900-5106 is cataloged in the U.S. Government catalog under NSN 4730-01-189-4604. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.