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Technical Data Sheet
PartsTable / COMPONENT / WWU531-18TA
WWU531-18TA ✓ 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 MODEM,COMMUNICATIONS is a the manufacturer industrial component. Key specifications include material: IRON OR STEEL TAILPIECE, seat_type: GROUND-JOINT, reducer_type: CONCENTRIC, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: SCREWED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-240-1679, 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
WWU531-18TA
NSN: 4730-00-240-1679
FSC: 4730
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialIRON OR STEEL TAILPIECE
seat_typeGROUND-JOINT
reducer_typeCONCENTRIC
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorSCREWED
surface_treatmentZINC OVERALL
operating_pressure300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
nominal_thread_size2.000 INCHES ALL ENDS IN
coupling_flange_shapeHEXAGON
maximum_operating_temp450.0 FAHRENHEIT SECOND RESPONSE DEGF
nominal_overall_length2.750 INCHES IN
NSN4730-00-240-1679
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: WWU531-18TA · 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
•
STYLE DESIGNATOR: SCREWED
•
OPERATING PRESSURE: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OR CASTM A675 ASSN STD 1ST MATERIAL RESPONSE TAILPIECE
•
MEDIA FOR WHICH DESIGNED: WATER-OIL-GAS SECOND RESPONSE
•
REDUCER TYPE: CONCENTRIC
•
NOMINAL THREAD SIZE: 2.000 INCHES ALL ENDS IN
•
COUPLING FLANGE SHAPE: HEXAGON
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OR AASTM A153,CLASS A ASSN STD 1ST TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORSCREWED
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OR CASTM A675 ASSN STD 1ST MATERIAL RESPONSE TAILPIECE
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS SECOND RESPONSE
REDUCER TYPECONCENTRIC
NOMINAL THREAD SIZE2.000 INCHES ALL ENDS IN
COUPLING FLANGE SHAPEHEXAGON
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OR AASTM A153,CLASS A ASSN STD 1ST TREATMENT RESPONSE OVERALL
NONDEFINITIVE SPEC/STD DATA1 CLASS AND B TYPE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR CASTM A576 ASSN STD 1ST MATERIAL RESPONSE OR CASTM A675 ASSN STD 1ST MATERIAL RESPONSE THREAD PIECE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
8N9TJPInterchangeable
interchangeable cross-reference
interchangeable
694Interchangeable
interchangeable cross-reference
interchangeable
8175464Interchangeable
interchangeable cross-reference
interchangeable
694-00Interchangeable
interchangeable cross-reference
interchangeable
2959Interchangeable
interchangeable cross-reference
interchangeable
105-224Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is WWU531-18TA?
WWU531-18TA is a MODEM,COMMUNICATIONS.
What parts can replace WWU531-18TA?
There are 25 known substitutes for WWU531-18TA: 8N9TJP, 694, 8175464 and 22 more. Substitute compatibility should be verified for your specific system.
Is WWU531-18TA still available?
WWU531-18TA 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