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GF503BH — COUPLING,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GF503BH: COUPLING,TUBE.

The COUPLING,TUBE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY NUT, special_features: CORROSION RESISTANT STEEL WIRE PER AMS5637(302), maximum_operating_temp: 135.0 CELSIUS SINGLE RESPONSE DEGC, end_item_identification: SPECIAL, AIR VEHICLE, AIRCRAFT, part_name_assigned_by_controlling_agency: FITTING DYNATUBE/DUAL-SEAL,MECHANICALLY. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-706-0259, 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
GF503BH
NSN: 4730-01-706-0259
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialTITANIUM ALLOY NUT
special_featuresCORROSION RESISTANT STEEL WIRE PER AMS5637(302)
maximum_operating_temp135.0 CELSIUS SINGLE RESPONSE DEGC
end_item_identificationSPECIAL, AIR VEHICLE, AIRCRAFT
part_name_assigned_by_controlling_agencyFITTING DYNATUBE/DUAL-SEAL,MECHANICALLY
NSN4730-01-706-0259
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GF503BH · 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
•
MAXIMUM OPERATING TEMP: 135.0 CELSIUS SINGLE RESPONSE DEGC
•
MATERIAL: TITANIUM ALLOY NUT
TECHNICAL CHARACTERISTICS
MAXIMUM OPERATING TEMP135.0 CELSIUS SINGLE RESPONSE DEGC
SPECIAL FEATURESCORROSION RESISTANT STEEL WIRE PER AMS5637(302)
PART NAME ASSIGNED BY CONTROLLING AGENCYFITTING DYNATUBE/DUAL-SEAL,MECHANICALLY
END ITEM IDENTIFICATIONSPECIAL, AIR VEHICLE, AIRCRAFT
MATERIALTITANIUM ALLOY NUT
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
GF503BH20ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GF503BH?
GF503BH is a COUPLING,TUBE.
What parts can replace GF503BH?
There is 1 known substitute for GF503BH: GF503BH20A. Substitute compatibility should be verified for your specific system.
What is the NSN for GF503BH?
GF503BH is cataloged in the U.S. Government catalog under NSN 4730-01-706-0259. 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.