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Technical Data Sheet
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FM4904 ✓ 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: 1.125 INCHES NOMINAL IN, overall_length: 2.906 INCHES NOMINAL IN, connection_style: BARBED OR SERRATED END ALL ENDS, style_designator: MALE COUPLING HALF, features_provided: SELF-SEALING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-096-8559, 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
FM4904
NSN: 4730-00-096-8559
FSC: 4730
CAGE: 14127 — FOSTER MANUFACTURING CO, INC. DBA FOSTER MANUFACTURING CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
leg_length1.125 INCHES NOMINAL IN
overall_length2.906 INCHES NOMINAL IN
connection_styleBARBED OR SERRATED END ALL ENDS
style_designatorMALE COUPLING HALF
features_providedSELF-SEALING
quick_disconnect_methodSPRING PUSH-PULL ALL ENDS
quick_disconnect_nominal_size0.500 INCHES ALL ENDS IN
nominal_inside_diameter_hose_accommodated0.500 INCHES ALL ENDS IN
NSN4730-00-096-8559
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: FM4904 · 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
•
QUICK DISCONNECT METHOD: SPRING PUSH-PULL ALL ENDS
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
MATERIAL: COPPER ALLOY BODY
•
FEATURES PROVIDED: SELF-SEALING
•
QUICK DISCONNECT NOMINAL SIZE: 0.500 INCHES ALL ENDS IN
•
LEG LENGTH: 1.125 INCHES NOMINAL IN
•
CONNECTION STYLE: BARBED OR SERRATED END ALL ENDS
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.500 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
QUICK DISCONNECT METHODSPRING PUSH-PULL ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
MATERIALCOPPER ALLOY BODY
FEATURES PROVIDEDSELF-SEALING
QUICK DISCONNECT NOMINAL SIZE0.500 INCHES ALL ENDS IN
LEG LENGTH1.125 INCHES NOMINAL IN
CONNECTION STYLEBARBED OR SERRATED END ALL ENDS
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.500 INCHES ALL ENDS IN
OVERALL LENGTH2.906 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
D15-560NPC671Interchangeable
interchangeable cross-reference
interchangeable
D15-698IPC671Interchangeable
interchangeable cross-reference
interchangeable
D15-430APC268Interchangeable
interchangeable cross-reference
interchangeable
40800Interchangeable
interchangeable cross-reference
interchangeable
40800-4Interchangeable
interchangeable cross-reference
interchangeable
BB1190Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FM4904?
FM4904 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace FM4904?
There are 16 known substitutes for FM4904: D15-560NPC671, D15-698IPC671, D15-430APC268 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FM4904?
FM4904 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-096-8559. 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