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6511-6503 — COUPLING,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

6511-6503: COUPLING,TUBE.

The COUPLING,TUBE is a the manufacturer industrial component. Key specifications include connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: PLAIN (TUBE) SECOND END, special_features: MACLEOD CO,TANK TYPE WATER DISTRIBUTOR,MODEL WD2M4X2, style_designator: PLAIN, media_for_which_designed: WATER SINGLE RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-212-2038, 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
6511-6503
NSN: 4730-01-212-2038
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 37562 — MACLEOD INC (USA)
SPECIFICATIONS
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_stylePLAIN (TUBE) SECOND END
special_featuresMACLEOD CO,TANK TYPE WATER DISTRIBUTOR,MODEL WD2M4X2
style_designatorPLAIN
media_for_which_designedWATER SINGLE RESPONSE
NSN4730-01-212-2038
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6511-6503 · 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 STYLE: PLAIN (TUBE) SECOND END
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
•
STYLE DESIGNATOR: PLAIN
•
MEDIA FOR WHICH DESIGNED: WATER SINGLE RESPONSE
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPLAIN (TUBE) SECOND END
CONNECTION STYLEPLAIN (TUBE) FIRST END
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
CONNECTION TYPEUNTHREADED EXTERNAL TUBE SECOND END
STYLE DESIGNATORPLAIN
SPECIAL FEATURESMACLEOD CO,TANK TYPE WATER DISTRIBUTOR,MODEL WD2M4X2
MEDIA FOR WHICH DESIGNEDWATER SINGLE RESPONSE
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
D6511-6503Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6511-6503?
6511-6503 is a COUPLING,TUBE.
What parts can replace 6511-6503?
There is 1 known substitute for 6511-6503: D6511-6503. Substitute compatibility should be verified for your specific system.
What is the NSN for 6511-6503?
6511-6503 is cataloged in the U.S. Government catalog under NSN 4730-01-212-2038. 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.