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Technical Data Sheet
PartsTable / COMPONENT / 3655-3/4
3655-3/4 ✓ 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 3655-3/4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-074-6556, 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
3655-3/4
NSN: 4730-01-074-6556
FSC: 4730
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
Part Number3655-3/4
NSN4730-01-074-6556
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3655-3/4 · 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
•
MEDIA FOR WHICH DESIGNED: STEAM FIRST RESPONSE
•
MATERIAL: COPPER ALLOY OVERALL
•
OPERATING PRESSURE: 1300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.750 INCHES ALL ENDS IN
•
CONNECTION STYLE: STREAMLINED W/ ONE BRAZING RING (PIPE) ALL ENDS
•
MAXIMUM OPERATING TEMP: 500.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS (FLIS)
MEDIA FOR WHICH DESIGNEDSTEAM FIRST RESPONSE
MATERIALCOPPER ALLOY OVERALL
OPERATING PRESSURE1300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS SECOND RESPONSE
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
NOMINAL PIPE SIZE ACCOMMODATED0.750 INCHES ALL ENDS IN
CONNECTION STYLESTREAMLINED W/ ONE BRAZING RING (PIPE) ALL ENDS
MAXIMUM OPERATING TEMP500.0 FAHRENHEIT SINGLE RESPONSE DEGF
CONNECTION TYPEUNTHREADED INTERNAL PIPE ALL ENDS
LEG LENGTH1.438 INCHES NOMINAL ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
3655Interchangeable
interchangeable cross-reference
interchangeable
FM184AInterchangeable
interchangeable cross-reference
interchangeable
29678Interchangeable
interchangeable cross-reference
interchangeable
58066-0000-0402Interchangeable
interchangeable cross-reference
interchangeable
03655Interchangeable
interchangeable cross-reference
interchangeable
HBL-9430AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3655-3/4?
3655-3/4 is a 3655-3/4.
What parts can replace 3655-3/4?
There are 14 known substitutes for 3655-3/4: 3655, FM184A, 29678 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3655-3/4?
3655-3/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-074-6556. 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