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56597D — ADAPTER,STRAIGHT,PIPE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

56597D: ADAPTER,STRAIGHT,PIPE TO TUBE.

The ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, thread_class: 2B FIRST END2B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST ENDTHREADED INTERNAL TUBE FIRST END, connection_style: DOUBLE COMPRESSION (TUBE) FIRST ENDDOUBLE COMPRESSION (TUBE) FIRST END, operating_pressure: 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 0.250 INCHES SECOND END0.250 INCHES SECOND END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-424-8150, 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
56597D
NSN: 4730-00-424-8150
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thread_class2B FIRST END2B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST ENDTHREADED INTERNAL TUBE FIRST END
connection_styleDOUBLE COMPRESSION (TUBE) FIRST ENDDOUBLE COMPRESSION (TUBE) FIRST END
operating_pressure5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.250 INCHES SECOND END0.250 INCHES SECOND END IN
seat_nominal_radius0.062 INCHES FIRST END IN
nominal_overall_length1.312 INCHES IN
end_item_identificationVARIOUS APPLICATIONSVARIOUS APPLICATIONS
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_quantity_per_inch20 FIRST END20 FIRST END
thread_series_designatorNPTF SECOND END
NSN4730-00-424-8150
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 56597D · 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 PREINSERTED BRAZING RING AND 1 TUBE COUPLING NUT
•
CONNECTION STYLE: PLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END
•
SEAT NOMINAL RADIUS: 0.062 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 1.312 INCHES IN
•
CONNECTION TYPE: THREADED INTERNAL TUBE FIRST ENDTHREADED INTERNAL TUBE FIRST END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY1 PREINSERTED BRAZING RING AND 1 TUBE COUPLING NUT
CONNECTION STYLEPLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END
CONNECTION STYLEDOUBLE COMPRESSION (TUBE) FIRST ENDDOUBLE COMPRESSION (TUBE) FIRST END
SEAT NOMINAL RADIUS0.062 INCHES FIRST END IN
NOMINAL OVERALL LENGTH1.312 INCHES IN
CONNECTION TYPETHREADED INTERNAL TUBE FIRST ENDTHREADED INTERNAL TUBE FIRST END
CONNECTION TYPETHREADED INTERNAL PIPE SECOND ENDTHREADED INTERNAL PIPE SECOND END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES FIRST END IN
OPERATING PRESSURE5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.250 INCHES SECOND END0.250 INCHES SECOND END IN
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
86LB-06X04Reference 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 56597D?
56597D is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 56597D?
There is 1 known substitute for 56597D: 86LB-06X04. Substitute compatibility should be verified for your specific system.
What is the NSN for 56597D?
56597D is cataloged in the U.S. Government catalog under NSN 4730-00-424-8150. This indicates validated use in U.S. government and defense supply chains.
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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.