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E22A78 — LOUDSPEAKER,ELECTROMAGNETIC

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

E22A78: LOUDSPEAKER,ELECTROMAGNETIC.

The LOUDSPEAKER,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2014 OVERALL, body_style: PLAIN, SOLID, bore_style: PLAIN BOTH ENDS, tooth_form: STANDARD, pitch_diameter: 1.2187 INCHES NOMINAL IN, pressure_angle: 20.0000 DEGREES. This part is cataloged in the U.S.

Government catalog under NSN 3020-00-537-3450, 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
E22A78
NSN: 3020-00-537-3450
FSC: 3020 — Gears, Pulleys, Sprockets, and Transmission Chain
CAGE: 00328 — DESIGNATRONICS INCORPORATED DIV STERLING INSTRUMENTS DIV (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 OVERALL
body_stylePLAIN, SOLID
bore_stylePLAIN BOTH ENDS
tooth_formSTANDARD
pitch_diameter1.2187 INCHES NOMINAL IN
pressure_angle20.0000 DEGREES
teeth_quantity78
style_designatorPROTRUDING HUB
surface_treatmentANODIZE OVERALL
face_nominal_width0.125 INCHES IN
backlash_designationGRADE C
hub_nominal_diameter0.375 INCHES FIRST END IN
NSN3020-00-537-3450
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LOUDSPEAKER,ELECTROMAGNETIC TITLE COMPONENT PN E22A78 MFR LOUDSPEAKER,ELECTROMAG
KEY FEATURES
•
BORE NOMINAL DIAMETER: 0.188 INCHES BOTH ENDS IN
•
HUB NOMINAL DIAMETER: 0.375 INCHES FIRST END IN
•
BACKLASH DESIGNATION: GRADE C
•
TEETH QUANTITY: 78
•
BODY STYLE: PLAIN, SOLID
•
BORE STYLE: PLAIN BOTH ENDS
•
NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END: 0.218 INCHES FIRST END IN
•
PRECISION CLASSIFICATION: QUALITY NUMBER 12
TECHNICAL CHARACTERISTICS
BORE NOMINAL DIAMETER0.188 INCHES BOTH ENDS IN
HUB NOMINAL DIAMETER0.375 INCHES FIRST END IN
BACKLASH DESIGNATIONGRADE C
TEETH QUANTITY78
BODY STYLEPLAIN, SOLID
BORE STYLEPLAIN BOTH ENDS
NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END0.218 INCHES FIRST END IN
PRECISION CLASSIFICATIONQUALITY NUMBER 12
STYLE DESIGNATORPROTRUDING HUB
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/4,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
PG6742-78Reference document
Same NSN cross-reference
Reference document — Secondary reference
101689Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is E22A78?
E22A78 is a LOUDSPEAKER,ELECTROMAGNETIC.
What parts can replace E22A78?
There are 2 known substitutes for E22A78: PG6742-78, 101689. Substitute compatibility should be verified for your specific system.
What is the NSN for E22A78?
E22A78 is cataloged in the U.S. Government catalog under NSN 3020-00-537-3450. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.