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A521913 — PLUG,TUBE FITTING,THREADED

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A521913: PLUG,TUBE FITTING,THREADED.

The PLUG,TUBE FITTING,THREADED is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, seat_angle: 12.0 DEGREES, head_height: 0.210 INCHES NOMINAL IN, thread_class: 3A EXTERNAL A, overall_length: 0.641 INCHES NOMINAL IN, connection_style: FLARELESS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-140-0769, 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
A521913
NSN: 4730-01-140-0769
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
seat_angle12.0 DEGREES
head_height0.210 INCHES NOMINAL IN
thread_class3A EXTERNAL A
overall_length0.641 INCHES NOMINAL IN
connection_styleFLARELESS
style_designatorPLUG, TUBE FITTING FLARELESS (NOTE: DRILLED HOLE IS OPTIONAL, SHOULD NOT BE CONSIDERED AS A SEPARATING CHARACTERISTIC)
thread_directionRIGHT-HAND EXTERNAL
surface_treatmentANODIZE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
nominal_thread_size0.438 INCHES EXTERNAL IN
maximum_operating_temp275.0 FAHRENHEIT DEGF
NSN4730-01-140-0769
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A521913 · 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
•
HEAD HEIGHT: 0.210 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: FLARELESS
•
STYLE DESIGNATOR: PLUG, TUBE FITTING FLARELESS (NOTE: DRILLED HOLE IS OPTIONAL, SHOULD NOT BE CONSIDERED AS A SEPARATING CHARACTERISTIC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/9,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
THREAD DIRECTION: RIGHT-HAND EXTERNAL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.210 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEFLARELESS
STYLE DESIGNATORPLUG, TUBE FITTING FLARELESS (NOTE: DRILLED HOLE IS OPTIONAL, SHOULD NOT BE CONSIDERED AS A SEPARATING CHARACTERISTIC)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/9,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH0.641 INCHES NOMINAL IN
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
THREAD DIRECTIONRIGHT-HAND EXTERNAL
NOMINAL THREAD SIZE0.438 INCHES EXTERNAL IN
SEAT ANGLE12.0 DEGREES
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 3
AS18280Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
MS21913W4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A521913?
A521913 is a PLUG,TUBE FITTING,THREADED.
What parts can replace A521913?
There are 3 known substitutes for A521913: AS18280, SAE-AS18280, MS21913W4. Substitute compatibility should be verified for your specific system.
What is the NSN for A521913?
A521913 is cataloged in the U.S. Government catalog under NSN 4730-01-140-0769. This indicates validated use in U.S. government and defense supply chains.
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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.