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Technical Data Sheet
PartsTable / COMPONENT / MIL-C-4109
MIL-C-4109 ✓ 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 operating_pressure: 1000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, maximum_operating_temp: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF, supplementary_features: PUSH-TYPE 1/4 INCH NPT COUPLING QUICJ CONNECT IN, end_item_identification: 3990-01-444-6174 DISTRIBUTOR, BITUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-005-7353, 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
MIL-C-4109
NSN: 4730-00-005-7353
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
operating_pressure1000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
supplementary_featuresPUSH-TYPE 1/4 INCH NPT COUPLING QUICJ CONNECT IN
end_item_identification3990-01-444-6174 DISTRIBUTOR, BITUM
NSN4730-00-005-7353
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MIL-C-4109 · 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
•
MATERIAL: COPPER ALLOY BODY
•
LEG LENGTH: 0.906 INCHES NOMINAL IN
•
CONNECTION STYLE: HOSE GRIPPING NIPPLE ALL ENDS
•
QUICK DISCONNECT NOMINAL SIZE: 0.422 INCHES ALL ENDS IN
•
QUICK DISCONNECT METHOD: SPRING PUSH-PULL ALL ENDS
•
FEATURES PROVIDED: SELF-SEALING
•
SPECIFICATION/STANDARD DATA: 58536-A-A-59439 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
•
NONDEFINITIVE SPEC/STD DATA: A CLASS AND 4 STYLE AND 1 TYPE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY BODY
LEG LENGTH0.906 INCHES NOMINAL IN
CONNECTION STYLEHOSE GRIPPING NIPPLE ALL ENDS
QUICK DISCONNECT NOMINAL SIZE0.422 INCHES ALL ENDS IN
QUICK DISCONNECT METHODSPRING PUSH-PULL ALL ENDS
FEATURES PROVIDEDSELF-SEALING
SPECIFICATION/STANDARD DATA58536-A-A-59439 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
NONDEFINITIVE SPEC/STD DATAA CLASS AND 4 STYLE AND 1 TYPE
STYLE DESIGNATORMALE COUPLING HALF
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.3985 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
AA59439-04-12-20-BInterchangeable
Same NIIN cross-reference
interchangeable
3SD7Interchangeable
Same NIIN cross-reference
interchangeable
AA59439-004-12-20-BInterchangeable
Same NIIN cross-reference
interchangeable
M4109-04-12-20-BInterchangeable
Same NIIN cross-reference
interchangeable
A-A-59439Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-C-4109?
MIL-C-4109 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace MIL-C-4109?
There are 5 known substitutes for MIL-C-4109: AA59439-04-12-20-B, 3SD7, AA59439-004-12-20-B and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-C-4109?
MIL-C-4109 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-005-7353. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026