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Technical Data Sheet
PartsTable / COMPONENT / 5591-5
5591-5 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL, body_style: PLAIN, shell_type: SOLID, terminal_type: TURRET SINGLE MATING END SINGLE CONTACT GROUPING, overall_length: 1.250 INCHES NOMINAL IN, shell_material: ALUMINUM ALLOY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-061-4954, 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
5591-5
NSN: 4730-00-061-4954
FSC: 4730
CAGE: 02121 — GOODRICH AEROSPACE CANADA LTD (CAN)
SPECIFICATIONS
materialSTEEL
body_stylePLAIN
shell_typeSOLID
terminal_typeTURRET SINGLE MATING END SINGLE CONTACT GROUPING
overall_length1.250 INCHES NOMINAL IN
shell_materialALUMINUM ALLOY
insert_materialPLASTIC SINGLE MATING END
special_featuresMATERIAL,METAL; 6.500 IN. LG; 1.000 IN. H; ONE UNTHREADED MTG HOLE 0.064 IN. DIA IN
surface_treatmentPASSIVATE
terminal_locationBACK SINGLE MATING END SINGLE CONTACT GROUPING
width_across_flats0.750 INCHES NOMINAL IN
mating_end_quantity1
NSN4730-00-061-4954
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5591-5 · 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
•
FIRST END NOMINAL THREAD SIZE: 0.500 INCHES IN
•
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER: 0.598 INCHES NOMINAL IN
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
CONCENTRIC HOLE DEPTH: 0.884 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
DISTANCE FROM FIRST RADIAL HOLE CENTER TO END OF BOLT: 0.775 INCHES NOMINAL IN
•
CONCENTRIC HOLE DIAMETER: 0.234 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18732,COND A MIL SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END NOMINAL THREAD SIZE0.500 INCHES IN
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER0.598 INCHES NOMINAL IN
FIRST END THREAD DIRECTIONRIGHT-HAND
CONCENTRIC HOLE DEPTH0.884 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
DISTANCE FROM FIRST RADIAL HOLE CENTER TO END OF BOLT0.775 INCHES NOMINAL IN
CONCENTRIC HOLE DIAMETER0.234 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18732,COND A MIL SPEC SINGLE MATERIAL RESPONSE
FIRST END THREAD SERIES DESIGNATORUNF
OVERALL LENGTH1.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
55915Interchangeable
interchangeable cross-reference
interchangeable
431LXInterchangeable
interchangeable cross-reference
interchangeable
SM-C-187645Interchangeable
interchangeable cross-reference
interchangeable
10366Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5591-5?
5591-5 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace 5591-5?
There are 4 known substitutes for 5591-5: 55915, 431LX, SM-C-187645 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5591-5?
5591-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-061-4954. 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