PartsTable
Technical Data Sheet
Download PDF

21591-400 — MANIFOLD,HYDRAULIC SYSTEM ACCESS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

21591-400: MANIFOLD,HYDRAULIC SYSTEM ACCESS.

MANIFOLD,HYDRAULIC SYSTEM ACCESS. Key specifications include material: ALUMINUM ALLOY, connection_type: BUTT WELD PIPE, special_features: WEAPON SYSTEM ESSENTIAL, end_item_identification: SEAWOLF CLASS SSN, criticality_code_justification: FEAT, nominal_pipe_size_accommodated: 0.812 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-390-5445, 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
21591-400
NSN: 4730-01-390-5445
NIINs: 013905445, 017081829
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
connection_typeBUTT WELD PIPE
special_featuresWEAPON SYSTEM ESSENTIAL
end_connection_quantity4
end_item_identificationSEAWOLF CLASS SSN
criticality_code_justificationFEAT
nominal_pipe_size_accommodated0.812 INCHES IN
end_item_design_control_activity78062
end_item_identification_designatorSUBPLATE ASSY,VALVE
NSN4730-01-390-5445
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21591-400 · 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
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.812 INCHES IN
•
END ITEM DESIGN CONTROL ACTIVITY: 78062
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
CONNECTION TYPE: BUTT WELD PIPE
•
END CONNECTION QUANTITY: 4
•
END ITEM IDENTIFICATION DESIGNATOR: SUBPLATE ASSY,VALVE
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE ACCOMMODATED0.812 INCHES IN
END ITEM DESIGN CONTROL ACTIVITY78062
CRITICALITY CODE JUSTIFICATIONFEAT
CONNECTION TYPEBUTT WELD PIPE
END CONNECTION QUANTITY4
END ITEM IDENTIFICATION DESIGNATORSUBPLATE ASSY,VALVE
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
MATERIALALUMINUM ALLOY
SUBSTITUTES & CROSS-REFERENCES 1
211032642Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 21591-400?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 21591-400?
21591-400 is a MANIFOLD,HYDRAULIC SYSTEM ACCESS.
What parts can replace 21591-400?
There is 1 known substitute for 21591-400: 211032642. Substitute compatibility should be verified for your specific system.
What is the NSN for 21591-400?
21591-400 is cataloged in the U.S. Government catalog under NSN 4730-01-390-5445. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 21591-400

✓ 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.