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GC550JU — NIPPLE,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GC550JU: NIPPLE,TUBE.

The NIPPLE,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630 OVERALL, seat_angle: 8.5 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: INVERTED FLARE (TUBE) ALL ENDS, style_designator: INVERTED FLARE W/ CENTER WRENCHING FACILITY. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-046-4032, 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
GC550JU
NSN: 4730-01-046-4032
NIINs: 010464032, 010473656
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 630 OVERALL
seat_angle8.5 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleINVERTED FLARE (TUBE) ALL ENDS
style_designatorINVERTED FLARE W/ CENTER WRENCHING FACILITY
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size1.000 INCHES ALL ENDS IN
nominal_overall_length1.124 INCHES IN
thread_quantity_per_inch16 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT (UNJ) ALL ENDS
nominal_outside_diameter_tube_accommodated0.750 INCHES ALL ENDS IN
NSN4730-01-046-4032
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550JU · 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: INVERTED FLARE (TUBE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 0.858 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: INVERTED FLARE W/ CENTER WRENCHING FACILITY
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.437 INCHES ALL ENDS IN
•
NOMINAL THREAD SIZE: 0.718 INCHES ALL ENDS IN
•
SEAT ANGLE: 8.500 DEGREES ALL ENDS
•
THREAD CLASS: 3A ALL ENDS A
TECHNICAL CHARACTERISTICS
CONNECTION STYLEINVERTED FLARE (TUBE) ALL ENDS
NOMINAL OVERALL LENGTH0.858 INCHES IN
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
STYLE DESIGNATORINVERTED FLARE W/ CENTER WRENCHING FACILITY
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.437 INCHES ALL ENDS IN
NOMINAL THREAD SIZE0.718 INCHES ALL ENDS IN
SEAT ANGLE8.500 DEGREES ALL ENDS
THREAD CLASS3A ALL ENDS A
THREAD QUANTITY PER INCH20 ALL ENDS
MATERIALSTEEL COMP 630 OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
R44101Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
GC550JU8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GC550JU?
GC550JU is a NIPPLE,TUBE.
What parts can replace GC550JU?
There are 2 known substitutes for GC550JU: R44101, GC550JU8. Substitute compatibility should be verified for your specific system.
What is the NSN for GC550JU?
GC550JU is cataloged in the U.S. Government catalog under NSN 4730-01-046-4032. 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.