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Technical Data Sheet
PartsTable / COMPONENT / MS21964-20
MS21964-20 ✓ 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: COPPER ALLOY BODY, leg_length: 1.276 INCHES MINIMUM AND 1.286 INCHES MAXIMUM IN, overall_length: 2.083 INCHES MINIMUM AND 2.103 INCHES MAXIMUM IN, connection_type: EXTERNAL QUICK DISCONNECT SECOND QUICK DISCONNECT END, connection_style: BARBED OR SERRATED END ALL ENDS, style_designator: MALE COUPLING HALF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-181-9638, 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
MS21964-20
NSN: 4730-01-181-9638
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY BODY
leg_length1.276 INCHES MINIMUM AND 1.286 INCHES MAXIMUM IN
overall_length2.083 INCHES MINIMUM AND 2.103 INCHES MAXIMUM IN
connection_typeEXTERNAL QUICK DISCONNECT SECOND QUICK DISCONNECT END
connection_styleBARBED OR SERRATED END ALL ENDS
special_featuresWEAPON SYSTEM ESSENTIAL; LIFE SUPPORT ITEM; DETAIL SPECIFICATION SHEET, MIL-DTL-7560/1, TITLED: VALVE ASSEMBLY, OXYGEN CYLINDER, BAILOUT
style_designatorMALE COUPLING HALF
surface_treatmentZINC BODY
end_item_identificationAIRCRAFT: C-141, C-5, C-130, F-111, T-39, B-52, F-15, C-135, AND THE B-2.
quick_disconnect_methodSPRING PUSH-LOCK SECOND QUICK DISCONNECT END
quick_disconnect_nominal_size0.250 INCHES SECOND QUICK DISCONNECT END IN
criticality_code_justificationFEAT
NSN4730-01-181-9638
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21964-20 · 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
•
SURFACE TREATMENT: ZINC BODY
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.188 INCHES ALL ENDS IN
•
QUICK DISCONNECT NOMINAL SIZE: 0.250 INCHES SECOND QUICK DISCONNECT END IN
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
CRITICALITY CODE JUSTIFICATION: FEAT
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL; LIFE SUPPORT ITEM; DETAIL SPECIFICATION SHEET, MIL-DTL-7560/1, TITLED: VALVE ASSEMBLY, OXYGEN CYLINDER, BAILOUT
PART NAME ASSIGNED BY CONTROLLING AGENCYFITTING, OXYGEN HOSE
SURFACE TREATMENTZINC BODY
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.188 INCHES ALL ENDS IN
QUICK DISCONNECT NOMINAL SIZE0.250 INCHES SECOND QUICK DISCONNECT END IN
STYLE DESIGNATORMALE COUPLING HALF
END ITEM IDENTIFICATIONAIRCRAFT: C-141, C-5, C-130, F-111, T-39, B-52, F-15, C-135, AND THE B-2.
CRITICALITY CODE JUSTIFICATIONFEAT
CONNECTION STYLEBARBED OR SERRATED END ALL ENDS
QUICK DISCONNECT METHODSPRING PUSH-LOCK SECOND QUICK DISCONNECT END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
M7560/1-14Interchangeable
interchangeable cross-reference
interchangeable
MS21964-14Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-7560Interchangeable
interchangeable cross-reference
interchangeable
MIL-V-7560Interchangeable
interchangeable cross-reference
interchangeable
1315Interchangeable
interchangeable cross-reference
interchangeable
77-737Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21964-20?
MS21964-20 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace MS21964-20?
There are 27 known substitutes for MS21964-20: M7560/1-14, MS21964-14, MIL-DTL-7560 and 24 more. Substitute compatibility should be verified for your specific system.
Is MS21964-20 still available?
MS21964-20 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026