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1639331 — ADAPTER,STRAIGHT,PIPE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1639331: ADAPTER,STRAIGHT,PIPE TO TUBE.

The ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, connection_type: THREADED EXTERNAL TUBE FIRST END, special_features: BLACK FINISH, surface_treatment: PAINT OVERALL, nominal_thread_size: 0.375 INCHES SECOND END IN, media_for_which_designed: HYDRAULIC FLUID SINGLE RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-341-0773, 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
1639331
NSN: 4730-01-341-0773
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
connection_typeTHREADED EXTERNAL TUBE FIRST END
special_featuresBLACK FINISH
surface_treatmentPAINT OVERALL
nominal_thread_size0.375 INCHES SECOND END IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorNPT SECOND END
furnished_items_and_quantity1 TUBE COUPLING NUT W/SLEEVE AND 1 PREFORMED PACKING
NSN4730-01-341-0773
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1639331 · 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
•
FURNISHED ITEMS AND QUANTITY: 1 TUBE COUPLING NUT W/SLEEVE AND 1 PREFORMED PACKING
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND END
•
NOMINAL THREAD SIZE: 0.375 INCHES SECOND END IN
•
SURFACE TREATMENT: PAINT OVERALL
•
MEDIA FOR WHICH DESIGNED: HYDRAULIC FLUID SINGLE RESPONSE
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY1 TUBE COUPLING NUT W/SLEEVE AND 1 PREFORMED PACKING
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
NOMINAL THREAD SIZE0.375 INCHES SECOND END IN
SPECIAL FEATURESBLACK FINISH
SURFACE TREATMENTPAINT OVERALL
MEDIA FOR WHICH DESIGNEDHYDRAULIC FLUID SINGLE RESPONSE
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORNPT SECOND END
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 1
24022823Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 1639331?
1639331 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 1639331?
There is 1 known substitute for 1639331: 24022823. Substitute compatibility should be verified for your specific system.
What is the NSN for 1639331?
1639331 is cataloged in the U.S. Government catalog under NSN 4730-01-341-0773. 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.