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PartsTable / COMPONENT / 1551AS656-7
1551AS656-7 ✓ 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 BUSHING,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304, style_designator: OUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL), surface_treatment: PASSIVATE, external_thread_size: 0.500-14, internal_thread_size: 0.250-18, end_item_identification: 3655-01-281-7747. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-301-0420, 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
1551AS656-7
NSN: 4730-01-301-0420
FSC: 4730
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 304
style_designatorOUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
surface_treatmentPASSIVATE
external_thread_size0.500-14
internal_thread_size0.250-18
end_item_identification3655-01-281-7747
external_thread_directionRIGHT-HAND
internal_thread_directionRIGHT-HAND
material_document_and_classificationFED STD 66, COMP 304 FED STD SINGLE MATERIAL RESPONSE
external_screw_thread_series_designatorANPT
internal_screw_thread_series_designatorNPT
NSN4730-01-301-0420
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS656-7 · 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
•
EXTERNAL THREAD DIRECTION: RIGHT-HAND
•
INTERNAL SCREW THREAD SERIES DESIGNATOR: NPT
•
EXTERNAL SCREW THREAD SERIES DESIGNATOR: ANPT
•
INTERNAL THREAD DIRECTION: RIGHT-HAND
•
SURFACE TREATMENT: PASSIVATE
•
MATERIAL: STEEL COMP 304
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66, COMP 304 FED STD SINGLE MATERIAL RESPONSE
•
STYLE DESIGNATOR: OUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
TECHNICAL CHARACTERISTICS (FLIS)
EXTERNAL THREAD DIRECTIONRIGHT-HAND
INTERNAL SCREW THREAD SERIES DESIGNATORNPT
EXTERNAL SCREW THREAD SERIES DESIGNATORANPT
INTERNAL THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTPASSIVATE
MATERIALSTEEL COMP 304
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66, COMP 304 FED STD SINGLE MATERIAL RESPONSE
STYLE DESIGNATOROUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
INTERNAL THREAD SIZE0.250-18
EXTERNAL THREAD SIZE0.500-14
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
MILF5509Interchangeable
interchangeable cross-reference
interchangeable
221-1086Interchangeable
interchangeable cross-reference
interchangeable
A90383-1Interchangeable
interchangeable cross-reference
interchangeable
AN9-12Interchangeable
interchangeable cross-reference
interchangeable
895-8DInterchangeable
interchangeable cross-reference
interchangeable
AS4861-01Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1551AS656-7?
1551AS656-7 is a BUSHING,PIPE.
What parts can replace 1551AS656-7?
There are 18 known substitutes for 1551AS656-7: MILF5509, 221-1086, A90383-1 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS656-7?
1551AS656-7 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-301-0420. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026