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A51P30550-11 — ADAPTER,STRAIGHT,FLANGE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A51P30550-11: ADAPTER,STRAIGHT,FLANGE TO BOSS.

ADAPTER,STRAIGHT,FLANGE TO BOSS. Key specifications include flange_shape: ROUND WITH HOLES FIRST END, connection_type: THREADED EXTERNAL BOSS SECOND END, nominal_thickness: 0.180 INCHES FIRST END IN, bolt_hole_quantity: 6 FIRST END, bolt_circle_nominal_diameter: 4.480 INCHES FIRST END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-413-1834, 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
A51P30550-11
NSN: 4730-00-413-1834
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
flange_shapeROUND WITH HOLES FIRST END
connection_typeTHREADED EXTERNAL BOSS SECOND END
nominal_thickness0.180 INCHES FIRST END IN
bolt_hole_quantity6 FIRST END
bolt_circle_nominal_diameter4.480 INCHES FIRST END IN
NSN4730-00-413-1834
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A51P30550-11 · 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
•
FLANGE SHAPE: ROUND WITH HOLES FIRST END
•
BOLT CIRCLE NOMINAL DIAMETER: 4.480 INCHES FIRST END IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS SECOND END
•
BOLT HOLE QUANTITY: 6 FIRST END
•
NOMINAL THICKNESS: 0.180 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FLANGE SHAPEROUND WITH HOLES FIRST END
BOLT CIRCLE NOMINAL DIAMETER4.480 INCHES FIRST END IN
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
CONNECTION TYPEFLANGE FIRST END
BOLT HOLE QUANTITY6 FIRST END
NOMINAL THICKNESS0.180 INCHES FIRST END IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A51P30550-11?
A51P30550-11 is a ADAPTER,STRAIGHT,FLANGE TO BOSS.
What is the NSN for A51P30550-11?
A51P30550-11 is cataloged in the U.S. Government catalog under NSN 4730-00-413-1834. 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.