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31000-312 — UNION,PIPE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

31000-312: UNION,PIPE TO TUBE.

The UNION,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, style_designator: FLARED AND FLARELESS W/ BULKHEAD THREAD, surface_treatment: CHROMATE ZINC BODY, coupling_flange_shape: HEXAGON, nominal_overall_length: 2.31 INCHES IN, part_name_assigned_by_controlling_agency: FLARED TUBE FITTINGS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-689-6467, 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
31000-312
NSN: 4730-01-689-6467
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL BODY
style_designatorFLARED AND FLARELESS W/ BULKHEAD THREAD
surface_treatmentCHROMATE ZINC BODY
coupling_flange_shapeHEXAGON
nominal_overall_length2.31 INCHES IN
part_name_assigned_by_controlling_agencyFLARED TUBE FITTINGS
NSN4730-01-689-6467
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 31000-312 · 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
•
COUPLING FLANGE SHAPE: HEXAGON
•
NOMINAL OVERALL LENGTH: 2.31 INCHES IN
•
STYLE DESIGNATOR: FLARED AND FLARELESS W/ BULKHEAD THREAD
•
SURFACE TREATMENT: CHROMATE ZINC BODY
•
MATERIAL: STEEL BODY
TECHNICAL CHARACTERISTICS
COUPLING FLANGE SHAPEHEXAGON
NOMINAL OVERALL LENGTH2.31 INCHES IN
STYLE DESIGNATORFLARED AND FLARELESS W/ BULKHEAD THREAD
SURFACE TREATMENTCHROMATE ZINC BODY
PART NAME ASSIGNED BY CONTROLLING AGENCYFLARED TUBE FITTINGS
MATERIALSTEEL BODY
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 31000-312?
31000-312 is a UNION,PIPE TO TUBE.
What is the NSN for 31000-312?
31000-312 is cataloged in the U.S. Government catalog under NSN 4730-01-689-6467. 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.