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1604-598 — CAP,LUBRICATION FITTING,PROTECTI

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1604-598: CAP,LUBRICATION FITTING,PROTECTI.

CAP,LUBRICATION FITTING,PROTECTI. Key specifications include material: PLASTIC OVERALL, thread_class: 2B INTERNAL, exterior_color: BLACK OVERALL, thread_direction: RIGHT-HAND INTERNAL, surface_treatment: OXIDE OVERALL, nominal_thread_size: 0.250 INCHES INTERNAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-541-8045, 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
1604-598
NSN: 4730-00-541-8045
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 97945 — PENNWALT CORP S S WHITE INDUSTRIAL PRODUCTS DIV (USA)
SPECIFICATIONS
materialPLASTIC OVERALL
thread_class2B INTERNAL
exterior_colorBLACK OVERALL
thread_directionRIGHT-HAND INTERNAL
surface_treatmentOXIDE OVERALL
nominal_thread_size0.250 INCHES INTERNAL IN
thread_series_designatorUNF INTERNAL
NSN4730-00-541-8045
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1604-598 · 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
•
THREAD DIRECTION: RIGHT-HAND INTERNAL
•
NOMINAL THREAD SIZE: 0.250 INCHES INTERNAL IN
•
EXTERIOR COLOR: BLACK OVERALL
•
SURFACE TREATMENT: OXIDE OVERALL
•
THREAD CLASS: 2B INTERNAL
•
MATERIAL: PLASTIC OVERALL
•
THREAD SERIES DESIGNATOR: UNF INTERNAL
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND INTERNAL
NOMINAL THREAD SIZE0.250 INCHES INTERNAL IN
EXTERIOR COLORBLACK OVERALL
SURFACE TREATMENTOXIDE OVERALL
THREAD CLASS2B INTERNAL
MATERIALPLASTIC OVERALL
THREAD SERIES DESIGNATORUNF INTERNAL
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
8526709Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1604-598?
1604-598 is a CAP,LUBRICATION FITTING,PROTECTI.
What parts can replace 1604-598?
There is 1 known substitute for 1604-598: 8526709. Substitute compatibility should be verified for your specific system.
What is the NSN for 1604-598?
1604-598 is cataloged in the U.S. Government catalog under NSN 4730-00-541-8045. 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.