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1551AS676 ✓ 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,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, reducer_type: CONCENTRIC, connection_type: THREADED EXTERNAL PIPE SECOND END, connection_style: PLAIN (PIPE) SECOND END, special_features: CLEAN PER CAJON CO. CA-6, operating_pressure: 7500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-300-4127, 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
1551AS676
NSN: 4730-01-300-4127
FSC: 4730
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
reducer_typeCONCENTRIC
connection_typeTHREADED EXTERNAL PIPE SECOND END
connection_stylePLAIN (PIPE) SECOND END
special_featuresCLEAN PER CAJON CO. CA-6
operating_pressure7500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.375 INCHES FIRST END IN
nominal_overall_length1.430 INCHES IN
media_for_which_designedOXYGEN, LIQUID SINGLE RESPONSE
thread_series_designatorNPT FIRST END
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
reference_number_differentiating_characteristicsSPECIAL CLEAN FOR LOX SERVICE
NSN4730-01-300-4127
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS676 · 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 THREAD SIZE: 0.375 INCHES FIRST END IN
•
CONNECTION STYLE: PLAIN (PIPE) SECOND END
•
THREAD SERIES DESIGNATOR: NPT FIRST END
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND END
•
NOMINAL OVERALL LENGTH: 1.430 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.375 INCHES FIRST END IN
CONNECTION STYLEPLAIN (PIPE) SECOND END
THREAD SERIES DESIGNATORNPT FIRST END
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
CONNECTION STYLEPLAIN (PIPE) FIRST END
NOMINAL THREAD SIZE0.250 INCHES SECOND END IN
NOMINAL OVERALL LENGTH1.430 INCHES IN
THREAD SERIES DESIGNATORNPT SECOND END
MEDIA FOR WHICH DESIGNEDOXYGEN, LIQUID SINGLE RESPONSE
OPERATING PRESSURE7500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
10292996-3Interchangeable
interchangeable cross-reference
interchangeable
ST57D123Interchangeable
interchangeable cross-reference
interchangeable
4-6 FFSSInterchangeable
interchangeable cross-reference
interchangeable
SS-6-HRN-4Interchangeable
Same NIIN cross-reference
interchangeable
1551AS676-5Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1551AS676?
1551AS676 is a REDUCER,TUBE.
What parts can replace 1551AS676?
There are 5 known substitutes for 1551AS676: 10292996-3, ST57D123, 4-6 FFSS and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS676?
1551AS676 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-300-4127. 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