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3B0551 ✓ 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 PLUG,PIPE is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, body_type: SOLID, head_type: SOLID, drive_end_style: RECESSED HEXAGONRECESSED HEXAGON, connection_style: PLAINPLAIN, thread_direction: RIGHT-HAND EXTERNALRIGHT-HAND EXTERNAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-263-3122, 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
3B0551
NSN: 4730-00-263-3122
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialIRON OVERALL
body_typeSOLID
head_typeSOLID
drive_end_styleRECESSED HEXAGONRECESSED HEXAGON
connection_stylePLAINPLAIN
thread_directionRIGHT-HAND EXTERNALRIGHT-HAND EXTERNAL
nominal_thread_size1.000 INCHES EXTERNAL1.000 INCHES EXTERNAL IN
end_item_identificationLOGISTICS SUPPORT VESSELLOGISTICS SUPPORT VESSEL
thread_series_designatorNPT EXTERNALNPT EXTERNAL
nondefinitive_spec/std_data2 TYPE AND 2 TYPE AND A STYLEA STYLE
material_document_and_classificationQQ-I-672 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-I-672 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
nominal_pipe_size_for_which_designed1.000 INCHES1.000 INCHES IN
NSN4730-00-263-3122
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3B0551 · 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
•
THREAD SERIES DESIGNATOR: NPT EXTERNALNPT EXTERNAL
•
BODY TYPE: SOLID
•
DRIVE END STYLE: RECESSED HEXAGONRECESSED HEXAGON
•
NOMINAL THREAD SIZE: 1.000 INCHES EXTERNAL1.000 INCHES EXTERNAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALLASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 2 TYPE AND A STYLEA STYLE
•
HEAD TYPE: SOLID
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORNPT EXTERNALNPT EXTERNAL
BODY TYPESOLID
DRIVE END STYLERECESSED HEXAGONRECESSED HEXAGON
NOMINAL THREAD SIZE1.000 INCHES EXTERNAL1.000 INCHES EXTERNAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALLASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
END ITEM IDENTIFICATIONLOGISTICS SUPPORT VESSELLOGISTICS SUPPORT VESSEL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 2 TYPE AND A STYLEA STYLE
HEAD TYPESOLID
CONNECTION STYLEPLAINPLAIN
MATERIALIRON OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
M-1303Interchangeable
interchangeable cross-reference
interchangeable
63C22268Interchangeable
interchangeable cross-reference
interchangeable
MK777-197Interchangeable
interchangeable cross-reference
interchangeable
32551Interchangeable
interchangeable cross-reference
interchangeable
94628Interchangeable
interchangeable cross-reference
interchangeable
42702Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3B0551?
3B0551 is a PLUG,PIPE.
What parts can replace 3B0551?
There are 16 known substitutes for 3B0551: M-1303, 63C22268, MK777-197 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3B0551?
3B0551 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-263-3122. 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