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A51P20520-13 — ADAPTER,STRAIGHT,FLANGE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A51P20520-13: ADAPTER,STRAIGHT,FLANGE TO TUBE.

ADAPTER,STRAIGHT,FLANGE TO TUBE. Key specifications include connection_type: UNTHREADED EXTERNAL TUBE FIRST END, connection_style: BEADED TUBE FIRST END, flange_face_design: PLAIN SECOND END, nominal_overall_length: 2.100 INCHES IN, nominal_outside_diameter_tube_accommodated: 3.500 INCHES FIRST END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-031-3279, 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
A51P20520-13
NSN: 4730-01-031-3279
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
connection_typeUNTHREADED EXTERNAL TUBE FIRST END
connection_styleBEADED TUBE FIRST END
flange_face_designPLAIN SECOND END
nominal_overall_length2.100 INCHES IN
nominal_outside_diameter_tube_accommodated3.500 INCHES FIRST END IN
NSN4730-01-031-3279
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A51P20520-13 · 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 FACE DESIGN: PLAIN SECOND END
•
CONNECTION STYLE: BEADED TUBE FIRST END
•
NOMINAL OVERALL LENGTH: 2.100 INCHES IN
•
CONNECTION TYPE: FLANGE SECOND END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 3.500 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FLANGE FACE DESIGNPLAIN SECOND END
CONNECTION STYLEBEADED TUBE FIRST END
NOMINAL OVERALL LENGTH2.100 INCHES IN
CONNECTION TYPEFLANGE SECOND END
CONNECTION TYPEUNTHREADED EXTERNAL TUBE FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED3.500 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 A51P20520-13?
A51P20520-13 is a ADAPTER,STRAIGHT,FLANGE TO TUBE.
What is the NSN for A51P20520-13?
A51P20520-13 is cataloged in the U.S. Government catalog under NSN 4730-01-031-3279. 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.