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Technical Data Sheet
PartsTable / COMPONENT / 678-4SL
678-4SL ✓ 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 ELBOW,TUBE TO HOSE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, flow_angle: 45.0 DEGREES, leg_length: 0.324 INCHES NOMINAL FIRST END IN, seat_angle: 37.0 DEGREES FIRST END, thread_class: 3B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-314-8818, 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
678-4SL
NSN: 4730-01-314-8818
FSC: 4730
CAGE: 98441 — PARKER HANNIFIN CORP DBA PNEUTRONICS DIV STRATOFLEX PRODUCTS DIVISION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
flow_angle45.0 DEGREES
leg_length0.324 INCHES NOMINAL FIRST END IN
seat_angle37.0 DEGREES FIRST END
thread_class3B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST END
connection_styleSWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
surface_treatmentANODIZE OVERALL
operating_pressure1000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES FIRST END IN
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
media_for_which_designedAERONAUTICAL FLUID SINGLE RESPONSE
NSN4730-01-314-8818
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 678-4SL · 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 STYLE: GRIPPING (HOSE) SECOND END
•
MATERIAL: ALUMINUM ALLOY 2024 OVERALL
•
FLOW ANGLE: 45.0 DEGREES
•
NONDEFINITIVE SPEC/STD DATA: 4 SIZE
•
SPECIFICATION/STANDARD DATA: 81349--83798/2-4L GOVERNMENT SPECIFICATION
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.219 INCHES SECOND END IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEGRIPPING (HOSE) SECOND END
MATERIALALUMINUM ALLOY 2024 OVERALL
FLOW ANGLE45.0 DEGREES
NONDEFINITIVE SPEC/STD DATA4 SIZE
SPECIFICATION/STANDARD DATA81349--83798/2-4L GOVERNMENT SPECIFICATION
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) FIRST END
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.219 INCHES SECOND END IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OPERATING PRESSURE1000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED0.496 INCHES SECOND END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
136-1045-6DInterchangeable
interchangeable cross-reference
interchangeable
M83798/2-6Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-83798Interchangeable
interchangeable cross-reference
interchangeable
M83798/2-5Interchangeable
interchangeable cross-reference
interchangeable
MS87019-5Interchangeable
interchangeable cross-reference
interchangeable
4310005808548Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 678-4SL?
678-4SL is a ELBOW,TUBE TO HOSE.
What parts can replace 678-4SL?
There are 29 known substitutes for 678-4SL: 136-1045-6D, M83798/2-6, MIL-DTL-83798 and 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 678-4SL?
678-4SL is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-314-8818. 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