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Technical Data Sheet
PartsTable / COMPONENT / MS27021-18
MS27021-18 ✓ 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: 4.125 INCHES MINIMUM IN, overall_length: 7.312 INCHES MINIMUM IN, connection_type: UNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION, connection_style: BARBED OR SERRATED END ALL ENDS, style_designator: MALE COUPLING HALF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-079-3305, 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
MS27021-18
NSN: 4730-01-079-3305
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY BODY
leg_length4.125 INCHES MINIMUM IN
overall_length7.312 INCHES MINIMUM IN
connection_typeUNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
connection_styleBARBED OR SERRATED END ALL ENDS
style_designatorMALE COUPLING HALF
quick_disconnect_methodCAM-LOCKING ALL ENDS
specification/standard_data96906-MS27021 GOVERNMENT STANDARD
quick_disconnect_nominal_size4.297 INCHES ALL ENDS IN
material_document_and_classificationQQ-B-626 FED SPEC 1ST MATERIAL RESPONSE AND QQ-C-390 FED SPEC 2ND MATERIAL RESPONSE AND QQ-C-390 FED SPEC 3RD MATERIAL RESPONSE BODY
nominal_inside_diameter_hose_accommodated4.000 INCHES ALL ENDS IN
NSN4730-01-079-3305
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS27021-18 · 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 TYPE: UNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626 FED SPEC 1ST MATERIAL RESPONSE AND QQ-C-390 FED SPEC 2ND MATERIAL RESPONSE AND QQ-C-390 FED SPEC 3RD MATERIAL RESPONSE BODY
•
CONNECTION STYLE: BARBED OR SERRATED END ALL ENDS
•
MATERIAL: COPPER ALLOY BODY
•
QUICK DISCONNECT NOMINAL SIZE: 4.297 INCHES ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 96906-MS27021 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH7.312 INCHES MINIMUM IN
CONNECTION TYPEUNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
CONNECTION TYPEEXTERNAL QUICK DISCONNECT FIRST QUICK DISCONNECT END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626 FED SPEC 1ST MATERIAL RESPONSE AND QQ-C-390 FED SPEC 2ND MATERIAL RESPONSE AND QQ-C-390 FED SPEC 3RD MATERIAL RESPONSE BODY
CONNECTION STYLEBARBED OR SERRATED END ALL ENDS
MATERIALCOPPER ALLOY BODY
QUICK DISCONNECT NOMINAL SIZE4.297 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA96906-MS27021 GOVERNMENT STANDARD
QUICK DISCONNECT METHODCAM-LOCKING ALL ENDS
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED4.000 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
MS27021-9Interchangeable
interchangeable cross-reference
interchangeable
15A107P1Interchangeable
interchangeable cross-reference
interchangeable
6-1-746-8-3AInterchangeable
interchangeable cross-reference
interchangeable
A-A-59326/2Interchangeable
interchangeable cross-reference
interchangeable
AA59326/2-4-BInterchangeable
interchangeable cross-reference
interchangeable
125-C-BRInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS27021-18?
MS27021-18 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace MS27021-18?
There are 25 known substitutes for MS27021-18: MS27021-9, 15A107P1, 6-1-746-8-3A and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS27021-18?
MS27021-18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-079-3305. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026