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PartsTable / COMPONENT / 91594521
91594521 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 0.970 INCHES NOMINAL IN, overall_length: 4.125 INCHES NOMINAL IN, connection_type: INTERNAL QUICK DISCONNECT ALL ENDS, connection_style: PLAIN ALL ENDS, style_designator: MALE COUPLING HALF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-038-0461, 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
91594521
NSN: 4730-01-038-0461
FSC: 4730
CAGE: F6481 — THALES SA (FRA)
SPECIFICATIONS
materialSTEEL BODY
leg_length0.970 INCHES NOMINAL IN
overall_length4.125 INCHES NOMINAL IN
connection_typeINTERNAL QUICK DISCONNECT ALL ENDS
connection_stylePLAIN ALL ENDS
style_designatorMALE COUPLING HALF
surface_treatmentPASSIVATE BODY
nominal_thread_size1.000 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_series_designatorNPT ALL ENDS
quick_disconnect_nominal_size1.000 INCHES ALL ENDS IN
material_document_and_classificationQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE BODY
NSN4730-01-038-0461
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 91594521 · 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 TYPE: INTERNAL QUICK DISCONNECT ALL ENDS
•
MATERIAL: STEEL BODY
•
CONNECTION STYLE: PLAIN ALL ENDS
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
QUICK DISCONNECT NOMINAL SIZE: 1.000 INCHES ALL ENDS IN
•
QUICK DISCONNECT METHOD: PUSH-PULL ALL ENDS
•
SURFACE TREATMENT: PASSIVATE BODY
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH4.125 INCHES NOMINAL IN
CONNECTION TYPEINTERNAL QUICK DISCONNECT ALL ENDS
MATERIALSTEEL BODY
CONNECTION STYLEPLAIN ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
QUICK DISCONNECT NOMINAL SIZE1.000 INCHES ALL ENDS IN
QUICK DISCONNECT METHODPUSH-PULL ALL ENDS
SURFACE TREATMENTPASSIVATE BODY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE BODY
CONNECTION TYPETHREADED INTERNAL PIPE FIRST FLUID END CONNECTION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
ST8D55Interchangeable
interchangeable cross-reference
interchangeable
GT519404-3-10Interchangeable
interchangeable cross-reference
interchangeable
TK8-36-303Interchangeable
interchangeable cross-reference
interchangeable
ST48D55-4Interchangeable
interchangeable cross-reference
interchangeable
H8F8Interchangeable
interchangeable cross-reference
interchangeable
ST48D55Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91594521?
91594521 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 91594521?
There are 15 known substitutes for 91594521: ST8D55, GT519404-3-10, TK8-36-303 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91594521?
91594521 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-038-0461. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026