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3H21VAA — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

3H21VAA: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 1.625 INCHES NOMINAL IN, overall_length: 2.609 INCHES NOMINAL IN, connection_type: THREADED INTERNAL PIPE FIRST FLUID END CONNECTION, connection_style: PLAIN ALL ENDS, style_designator: MALE COUPLING HALF. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-217-5728, 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
3H21VAA
NSN: 4730-01-217-5728
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 01276 — DANFOSS POWER SOLUTIONS II, LLC (USA)
SPECIFICATIONS
materialSTEEL BODY
leg_length1.625 INCHES NOMINAL IN
overall_length2.609 INCHES NOMINAL IN
connection_typeTHREADED INTERNAL PIPE FIRST FLUID END CONNECTION
connection_stylePLAIN ALL ENDS
style_designatorMALE COUPLING HALF
nominal_thread_size0.375 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_series_designatorNPT ALL ENDS
NSN4730-01-217-5728
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3H21VAA · 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: PLAIN ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL PIPE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
LEG LENGTH: 1.625 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.375 INCHES ALL ENDS IN
•
MATERIAL: STEEL BODY
•
QUICK DISCONNECT METHOD: PUSH-PULL ALL ENDS
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPLAIN ALL ENDS
CONNECTION TYPETHREADED INTERNAL PIPE FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH2.609 INCHES NOMINAL IN
LEG LENGTH1.625 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.375 INCHES ALL ENDS IN
MATERIALSTEEL BODY
QUICK DISCONNECT METHODPUSH-PULL ALL ENDS
THREAD SERIES DESIGNATORNPT ALL ENDS
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
FD45-1045-06-06Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3H21VAA?
3H21VAA is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 3H21VAA?
There is 1 known substitute for 3H21VAA: FD45-1045-06-06. Substitute compatibility should be verified for your specific system.
What is the NSN for 3H21VAA?
3H21VAA is cataloged in the U.S. Government catalog under NSN 4730-01-217-5728. 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.