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Technical Data Sheet
PartsTable / COMPONENT / WWU531-04TA
WWU531-04TA ✓ 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 UNION,PIPE is a the manufacturer industrial component. Key specifications include material: IRON OR STEEL NUT, 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 4730-00-266-3906, 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
WWU531-04TA
NSN: 4730-00-266-3906
FSC: 4730
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialIRON OR STEEL NUT
seat_typeGROUND-JOINT
reducer_typeCONCENTRIC
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorSCREWED
operating_pressure300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
nominal_thread_size0.750 INCHES ALL ENDS IN
coupling_flange_shapeHEXAGON
maximum_operating_temp450.0 FAHRENHEIT FIRST RESPONSE DEGF
nominal_overall_length1.940 INCHES IN
media_for_which_designedWATER-OIL-GAS SECOND RESPONSE
NSN4730-00-266-3906
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: WWU531-04TA · 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
•
SPECIFICATION/STANDARD DATA: 81348-WW-U-531 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
•
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 ASTM A675 ASSN STD 2ND MATERIAL RESPONSE THREAD PIECE
•
OPERATING PRESSURE: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
•
REDUCER TYPE: CONCENTRIC
•
NOMINAL THREAD SIZE: 0.750 INCHES ALL ENDS IN
•
COUPLING FLANGE SHAPE: HEXAGON
•
MAXIMUM OPERATING TEMP: 450.0 FAHRENHEIT SECOND RESPONSE DEGF
TECHNICAL CHARACTERISTICS (FLIS)
SPECIFICATION/STANDARD DATA81348-WW-U-531 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
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 ASTM A675 ASSN STD 2ND MATERIAL RESPONSE THREAD PIECE
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
REDUCER TYPECONCENTRIC
NOMINAL THREAD SIZE0.750 INCHES ALL ENDS IN
COUPLING FLANGE SHAPEHEXAGON
MAXIMUM OPERATING TEMP450.0 FAHRENHEIT SECOND RESPONSE DEGF
MAXIMUM OPERATING TEMP450.0 FAHRENHEIT FIRST RESPONSE DEGF
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 ASTM A675 ASSN STD 2ND MATERIAL RESPONSE NUT
MATERIALIRON OR STEEL NUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
41491Interchangeable
Pliers,jewelers'
interchangeable
46.334Interchangeable
Pliers,jewelers'
interchangeable
GGG-P-475 TY1Interchangeable
Pliers,jewelers'
interchangeable
46334Interchangeable
interchangeable cross-reference
interchangeable
ASME-B16.39Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is WWU531-04TA?
WWU531-04TA is a UNION,PIPE.
What parts can replace WWU531-04TA?
There are 5 known substitutes for WWU531-04TA: 41491, 46.334, GGG-P-475 TY1 and 2 more. Substitute compatibility should be verified for your specific system.
Is WWU531-04TA still available?
WWU531-04TA 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