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Technical Data Sheet
PartsTable / COMPONENT / 656-F-1/4X3/16
656-F-1/4X3/16 ✓ 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 656-F-1/4X3/16 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-808-7798, 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
656-F-1/4X3/16
NSN: 4730-00-808-7798
FSC: 4730
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
Part Number656-F-1/4X3/16
NSN4730-00-808-7798
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 656-F-1/4X3/16 · 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 OVERALL
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
NOMINAL THREAD SIZE: 0.375 INCHES SECOND END IN
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES FIRST END IN
•
THREAD CLASS: 3A ALL ENDS A
•
REDUCER TYPE: CONCENTRIC
•
NOMINAL OVERALL LENGTH: 1.125 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
THREAD SERIES DESIGNATORUNF ALL ENDS
NOMINAL THREAD SIZE0.375 INCHES SECOND END IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES FIRST END IN
THREAD CLASS3A ALL ENDS A
REDUCER TYPECONCENTRIC
NOMINAL OVERALL LENGTH1.125 INCHES IN
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
CONNECTION STYLEFLARED (TUBE) ALL ENDS
SEAT ANGLE45.0 DEGREES ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
PH20Interchangeable
interchangeable cross-reference
interchangeable
664340Interchangeable
interchangeable cross-reference
interchangeable
110AInterchangeable
interchangeable cross-reference
interchangeable
D15-651FPC521Interchangeable
interchangeable cross-reference
interchangeable
D15-651QPC521Interchangeable
interchangeable cross-reference
interchangeable
3519Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 656-F-1/4X3/16?
656-F-1/4X3/16 is a 656-F-1/4X3/16.
What parts can replace 656-F-1/4X3/16?
There are 23 known substitutes for 656-F-1/4X3/16: PH20, 664340, 110A and 20 more. Substitute compatibility should be verified for your specific system.
Is 656-F-1/4X3/16 still available?
656-F-1/4X3/16 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