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633DD-4X3AL ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, connection_style: PLAIN ALL ENDS, special_features: WEAPON SYSTEM ESSENTIAL, style_designator: MALE COUPLING HALF, surface_treatment: ANODIZE BODY, nominal_thread_size: 3.000 INCHES ALL ENDS IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-109-2513, 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
633DD-4X3AL
NSN: 4730-00-109-2513
FSC: 4730
CAGE: 81718 — OPW FUELING COMPONENTS INC. DIV OPW FUELING COMPONENTS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
connection_stylePLAIN ALL ENDS
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorMALE COUPLING HALF
surface_treatmentANODIZE BODY
nominal_thread_size3.000 INCHES ALL ENDS IN
end_item_identificationWTR STORAGE AND DISTRIBUTION SYSTEMS (WSDS)
quick_disconnect_methodCAM-LOCKING ALL ENDS
thread_series_designatorNPT ALL ENDS
quick_disconnect_nominal_size4.000 INCHES ALL ENDS IN
criticality_code_justificationFEAT
material_document_and_classificationQQ-A-601,T6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-601,T5 FED SPEC 2ND MATERIAL RESPONSE BODY
NSN4730-00-109-2513
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 633DD-4X3AL · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-601,T6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-601,T5 FED SPEC 2ND MATERIAL RESPONSE BODY
•
QUICK DISCONNECT NOMINAL SIZE: 4.000 INCHES ALL ENDS IN
•
QUICK DISCONNECT METHOD: CAM-LOCKING ALL ENDS
•
MATERIAL: ALUMINUM ALLOY BODY
•
NOMINAL THREAD SIZE: 3.000 INCHES ALL ENDS IN
•
STYLE DESIGNATOR: MALE COUPLING HALF
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEPLAIN ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-601,T6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-601,T5 FED SPEC 2ND MATERIAL RESPONSE BODY
END ITEM IDENTIFICATIONWTR STORAGE AND DISTRIBUTION SYSTEMS (WSDS)
QUICK DISCONNECT NOMINAL SIZE4.000 INCHES ALL ENDS IN
QUICK DISCONNECT METHODCAM-LOCKING ALL ENDS
MATERIALALUMINUM ALLOY BODY
NOMINAL THREAD SIZE3.000 INCHES ALL ENDS IN
STYLE DESIGNATORMALE COUPLING HALF
THREAD SERIES DESIGNATORNPT ALL ENDS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
A-A-59326/1Interchangeable
interchangeable cross-reference
interchangeable
633-A 3INInterchangeable
interchangeable cross-reference
interchangeable
AA59326/1A-8-AInterchangeable
interchangeable cross-reference
interchangeable
A-A-59326/18Interchangeable
interchangeable cross-reference
interchangeable
AA59326/18-1-SS-1Interchangeable
interchangeable cross-reference
interchangeable
633DD4X3INALInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 633DD-4X3AL?
633DD-4X3AL is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 633DD-4X3AL?
There are 11 known substitutes for 633DD-4X3AL: A-A-59326/1, 633-A 3IN, AA59326/1A-8-A and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 633DD-4X3AL?
633DD-4X3AL is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-109-2513. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026