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PartsTable / COMPONENT / NAS591-8
NAS591-8 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include body_width: 5.375 INCHES NOMINAL IN, body_height: 3.875 INCHES NOMINAL IN, body_length: 7.750 INCHES NOMINAL IN, inclosure_type: FULLY INCLOSED, mounting_method: UNTHREADED HOLE(S) SINGLE GROUP, frequency_rating: 60.0 HERTZ NOMINAL SINGLE COMPONENT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-684-7303, 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
NAS591-8
NSN: 4730-00-684-7303
FSC: 4730
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
body_width5.375 INCHES NOMINAL IN
body_height3.875 INCHES NOMINAL IN
body_length7.750 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
mounting_methodUNTHREADED HOLE(S) SINGLE GROUP
frequency_rating60.0 HERTZ NOMINAL SINGLE COMPONENT
reliability_indicatorNOT ESTABLISHED
mounting_hole_diameter0.281 INCHES NOMINAL SINGLE GROUP IN
end_item_identificationAN/GSS-26(V)
winding_operating_current3.1 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
winding_operating_voltage440.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
mounting_facility_quantity4 SINGLE GROUP
NSN4730-00-684-7303
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NAS591-8 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
10-319256-1Interchangeable
interchangeable cross-reference
interchangeable
1-300-195-01Interchangeable
interchangeable cross-reference
interchangeable
41778Interchangeable
interchangeable cross-reference
interchangeable
BUWEPSDWG2097839Interchangeable
interchangeable cross-reference
interchangeable
67040400Interchangeable
interchangeable cross-reference
interchangeable
2097839Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS591-8?
NAS591-8 is a INVERTED NUT,TUBE COUPLING.
What parts can replace NAS591-8?
There are 6 known substitutes for NAS591-8: 10-319256-1, 1-300-195-01, 41778 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS591-8?
NAS591-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-684-7303. 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