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Technical Data Sheet
PartsTable / MRO / A684
A684 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include angle: 45.0 DEGREES, height: 1.500 INCHES NOMINAL IN, material: COPPER ALLOY OVERALL, body_length: 2.843 INCHES NOMINAL IN, shank_length: 0.312 INCHES NOMINAL IN, body_material: METAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-188-6320, 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
MRO→ MRO_GENERAL→ A684
NSN: 4730-00-188-6320
FSC: 4730
CAGE: 95879 — STEWART-WARNER ALEMITE CORP (USA)
SPECIFICATIONS
angle45.0 DEGREES
height1.500 INCHES NOMINAL IN
materialCOPPER ALLOY OVERALL
body_length2.843 INCHES NOMINAL IN
shank_length0.312 INCHES NOMINAL IN
body_materialMETAL
inclosure_typeENCASED
overall_length3.764 INCHES NOMINAL IN
special_featuresSURFACELOCATED BALL CHECK VALVE; WEAPON SYSTEM ESSENTIAL; END ITEM: F-15 EAGLE AIRCRAFT
style_designatorROUND TERMINAL/TERMINALS ON OPPOSITE SURFACES
maximum_temp_rise25.0 CELSIUS DEGC
surface_treatmentNICKEL OVERALL
NSN4730-00-188-6320
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A684 · 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
•
HEIGHT: 1.500 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: NPTF
•
ASSEMBLY CLEARANCE RADIUS: 0.844 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 27
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HEIGHT1.500 INCHES NOMINAL IN
SPECIAL FEATURESSURFACELOCATED BALL CHECK VALVE; WEAPON SYSTEM ESSENTIAL; END ITEM: F-15 EAGLE AIRCRAFT
SCREW THREAD SERIES DESIGNATORNPTF
ASSEMBLY CLEARANCE RADIUS0.844 INCHES NOMINAL IN
THREAD QUANTITY PER INCH27
CRITICALITY CODE JUSTIFICATIONFEAT
NOMINAL THREAD SIZE0.125 INCHES IN
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
ANGLE45.0 DEGREES
SURFACE TREATMENTNICKEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
ST7M298-1Interchangeable
interchangeable cross-reference
interchangeable
317-6709-805881RInterchangeable
interchangeable cross-reference
interchangeable
M336Interchangeable
interchangeable cross-reference
interchangeable
P12807Interchangeable
interchangeable cross-reference
interchangeable
A684Interchangeable
interchangeable cross-reference
interchangeable
5B156Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A684?
A684 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace A684?
There are 17 known substitutes for A684: ST7M298-1, 317-6709-805881R, M336 and 14 more. Substitute compatibility should be verified for your specific system.
Is A684 still available?
A684 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