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1551AS657-1 — NIPPLE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1551AS657-1: NIPPLE,PIPE.

The NIPPLE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, connection_type: THREADED EXTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, special_features: E/I 3955-01-281-7747, style_designator: CENTER WRENCHING FACILITY, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-300-9029, 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
1551AS657-1
NSN: 4730-01-300-9029
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
connection_typeTHREADED EXTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
special_featuresE/I 3955-01-281-7747
style_designatorCENTER WRENCHING FACILITY
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.125 INCHES ALL ENDS IN
nominal_overall_length0.968 INCHES IN
thread_series_designatorANPT ALL ENDS
specification/standard_data88044-AN911 GOVERNMENT STANDARD
criticality_code_justificationZZZY
surface_treatment_document_and_classificationQQ-P-35,TYPE1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN4730-01-300-9029
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS657-1 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35,TYPE1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 0.968 INCHES IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
CONNECTION TYPE: THREADED EXTERNAL PIPE ALL ENDS
•
STYLE DESIGNATOR: CENTER WRENCHING FACILITY
•
NOMINAL THREAD SIZE: 0.125 INCHES ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 88044-AN911 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TYPE1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
NOMINAL OVERALL LENGTH0.968 INCHES IN
CRITICALITY CODE JUSTIFICATIONZZZY
CONNECTION TYPETHREADED EXTERNAL PIPE ALL ENDS
STYLE DESIGNATORCENTER WRENCHING FACILITY
NOMINAL THREAD SIZE0.125 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA88044-AN911 GOVERNMENT STANDARD
SPECIAL FEATURESE/I 3955-01-281-7747
SURFACE TREATMENTPASSIVATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
AS4860J04Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
1551AS657Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 1551AS657-1?
1551AS657-1 is a NIPPLE,PIPE.
What parts can replace 1551AS657-1?
There are 2 known substitutes for 1551AS657-1: AS4860J04, 1551AS657. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS657-1?
1551AS657-1 is cataloged in the U.S. Government catalog under NSN 4730-01-300-9029. This indicates validated use in U.S. government and defense supply chains.
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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.