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31865600 — COUPLING,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

31865600: COUPLING,TUBE.

The COUPLING,TUBE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY AND PLASTIC ACETAL OVERALL, thread_class: 2A FIRST END A, connection_type: UNTHREADED EXTERNAL TUBE ALL ENDS, connection_style: SOCKET (TUBE) ALL ENDS, special_features: W/BULKHEAD THDS, style_designator: COUPLING TUBE W/BULKHEAD UNION. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-111-5628, 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
31865600
NSN: 4730-01-111-5628
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 58755 — LEGRIS INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY AND PLASTIC ACETAL OVERALL
thread_class2A FIRST END A
connection_typeUNTHREADED EXTERNAL TUBE ALL ENDS
connection_styleSOCKET (TUBE) ALL ENDS
special_featuresW/BULKHEAD THDS
style_designatorCOUPLING TUBE W/BULKHEAD UNION
operating_pressure160.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES FIRST END IN
maximum_operating_temp160.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length2.431 INCHES IN
media_for_which_designedFLUID SINGLE RESPONSE
thread_series_designatorUNF FIRST END
NSN4730-01-111-5628
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 31865600 · 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
•
CONNECTION STYLE: SOCKET (TUBE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 2.431 INCHES IN
•
CONNECTION TYPE: UNTHREADED EXTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: COUPLING TUBE W/BULKHEAD UNION
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
OPERATING PRESSURE: 160.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.438 INCHES FIRST END IN
•
MAXIMUM OPERATING TEMP: 160.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS
CONNECTION STYLESOCKET (TUBE) ALL ENDS
NOMINAL OVERALL LENGTH2.431 INCHES IN
CONNECTION TYPEUNTHREADED EXTERNAL TUBE ALL ENDS
STYLE DESIGNATORCOUPLING TUBE W/BULKHEAD UNION
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
OPERATING PRESSURE160.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
MAXIMUM OPERATING TEMP160.0 FAHRENHEIT SINGLE RESPONSE DEGF
SPECIAL FEATURESW/BULKHEAD THDS
MEDIA FOR WHICH DESIGNEDFLUID SINGLE RESPONSE
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 31865600?
31865600 is a COUPLING,TUBE.
What is the NSN for 31865600?
31865600 is cataloged in the U.S. Government catalog under NSN 4730-01-111-5628. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.