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Technical Data Sheet
PartsTable / COMPONENT / 551-1/2
551-1/2 ✓ 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 551-1/2 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-852-8758, 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
551-1/2
NSN: 4730-00-852-8758
FSC: 4730
CAGE: 80996 — ITT GRINNELL CORP (USA)
SPECIFICATIONS
Part Number551-1/2
NSN4730-00-852-8758
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 551-1/2 · 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 ALL ENDS
•
OPERATING PRESSURE: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND END
•
CONNECTION STYLE: PLAIN (PIPE) FIRST END
•
SEAT TYPE: GROUND-JOINT
•
NOMINAL THREAD SIZE: 0.500 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORNPT ALL ENDS
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
CONNECTION STYLEPLAIN (PIPE) FIRST END
CONNECTION TYPETHREADED INTERNAL PIPE FIRST END
SEAT TYPEGROUND-JOINT
CONNECTION STYLEPLAIN (PIPE) SECOND END
NOMINAL THREAD SIZE0.500 INCHES ALL ENDS IN
STYLE DESIGNATORSCREWED
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A197 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
7686Interchangeable
interchangeable cross-reference
interchangeable
GS-4844Interchangeable
interchangeable cross-reference
interchangeable
38ENSIGN7686Interchangeable
interchangeable cross-reference
interchangeable
282-4501-801805REVFPCF40Interchangeable
interchangeable cross-reference
interchangeable
E8643APC55-1 1-2Interchangeable
interchangeable cross-reference
interchangeable
565-4105-1016997ALTIPC5SH1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 551-1/2?
551-1/2 is a 551-1/2.
What parts can replace 551-1/2?
There are 21 known substitutes for 551-1/2: 7686, GS-4844, 38ENSIGN7686 and 18 more. Substitute compatibility should be verified for your specific system.
Is 551-1/2 still available?
551-1/2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026