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Technical Data Sheet
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6502977 ✓ 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 NUT,TUBE COUPLING,REDUCING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.594 INCHES NOMINAL IN, seat_angle: 45.0 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-176-6732, 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
6502977
NSN: 4730-01-176-6732
FSC: 4730
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.594 INCHES NOMINAL IN
seat_angle45.0 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats0.750 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
smallest_inside_diameter0.188 INCHES NOMINAL IN
thread_quantity_per_inch20
NSN4730-01-176-6732
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6502977 · 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 SERIES: UNF
•
THREAD QUANTITY PER INCH: 20
•
MATERIAL: COPPER ALLOY OVERALL
•
FABRICATION METHOD: MACHINED
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
SEAT ANGLE: 45.0 DEGREES NOMINAL
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNF
THREAD QUANTITY PER INCH20
MATERIALCOPPER ALLOY OVERALL
FABRICATION METHODMACHINED
THREAD DIRECTIONRIGHT-HAND
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
SEAT ANGLE45.0 DEGREES NOMINAL
NOMINAL THREAD SIZE0.438 INCHES IN
SMALLEST INSIDE DIAMETER0.188 INCHES NOMINAL IN
NUT STYLETUBE COUPLING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
5409-S17-6-4Interchangeable
interchangeable cross-reference
interchangeable
503-4556027 ITEM 17Interchangeable
interchangeable cross-reference
interchangeable
2670-57ITEM17Interchangeable
interchangeable cross-reference
interchangeable
202208-18-16BInterchangeable
interchangeable cross-reference
interchangeable
1889863PC157Interchangeable
interchangeable cross-reference
interchangeable
2670-57 ITEM 13Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6502977?
6502977 is a NUT,TUBE COUPLING,REDUCING.
What parts can replace 6502977?
There are 25 known substitutes for 6502977: 5409-S17-6-4, 503-4556027 ITEM 17, 2670-57ITEM17 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 6502977?
6502977 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-176-6732. 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