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638999 — BEND,TUBE,RETURN

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

638999: BEND,TUBE,RETURN.

The BEND,TUBE,RETURN is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY LONG SWIVEL NUT, thread_class: 2B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST END, connection_style: INSERT (HOSE) SECOND END, surface_treatment: NICKEL TUBE, nominal_thread_size: 0.562 INCHES FIRST END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-308-4884, 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
638999
NSN: 4730-01-308-4884
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 49956 — RAYTHEON COMPANY DIV CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY LONG SWIVEL NUT
thread_class2B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST END
connection_styleINSERT (HOSE) SECOND END
surface_treatmentNICKEL TUBE
nominal_thread_size0.562 INCHES FIRST END IN
seat_nominal_radius0.675 INCHES FIRST END IN
thread_series_designatorUNEF FIRST END
nominal_inside_diameter_hose_accommodated0.375 INCHES SECOND END IN
nominal_outside_diameter_tube_accommodated0.625 INCHES FIRST END IN
NSN4730-01-308-4884
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 638999 · 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: INSERT (HOSE) SECOND END
•
SEAT NOMINAL RADIUS: 0.675 INCHES FIRST END IN
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.375 INCHES SECOND END IN
•
CONNECTION TYPE: UNTHREADED EXTERNAL HOSE SECOND END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.625 INCHES FIRST END IN
•
NOMINAL THREAD SIZE: 0.562 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEINSERT (HOSE) SECOND END
CONNECTION STYLESWIVEL NUT, COMPRESSION (TUBE) FIRST END
SEAT NOMINAL RADIUS0.675 INCHES FIRST END IN
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.375 INCHES SECOND END IN
CONNECTION TYPEUNTHREADED EXTERNAL HOSE SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES FIRST END IN
NOMINAL THREAD SIZE0.562 INCHES FIRST END IN
SURFACE TREATMENTNICKEL LONG SWIVEL NUT
SURFACE TREATMENTNICKEL TUBE
SUBSTITUTES & CROSS-REFERENCES 1
B 49956Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 638999?
638999 is a BEND,TUBE,RETURN.
What parts can replace 638999?
There is 1 known substitute for 638999: B 49956. Substitute compatibility should be verified for your specific system.
What is the NSN for 638999?
638999 is cataloged in the U.S. Government catalog under NSN 4730-01-308-4884. This indicates validated use in U.S. government and defense supply chains.
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