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Technical Data Sheet
FD78 ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
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Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The CONFERENCE BRIDGE,TELEPHONE is a the manufacturer industrial component. Key specifications include material: STEEL LOCATION NOT OTHERWISE SPECIFIED, body_shape: ROUND, design_type: DRY, coolant_type: AIR, inlet_location: OFFSET FROM CENTER IN BOTTOM, muffler_design: STRAIGHT THROUGH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2990-00-846-0732, 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
FD78
NSN: 2990-00-846-0732
FSC: 2990
CAGE: 76110 — MAREMONT CORP (USA)
SPECIFICATIONS
materialSTEEL LOCATION NOT OTHERWISE SPECIFIED
body_shapeROUND
design_typeDRY
coolant_typeAIR
inlet_locationOFFSET FROM CENTER IN BOTTOM
muffler_designSTRAIGHT THROUGH
overall_length22.000 INCHES NOMINAL IN
outlet_locationOFFSET FROM CENTER IN TOP
overall_diameter5.250 INCHES NOMINAL IN
surface_treatmentALUMINUM
operating_positionHORIZONTAL
inlet_connection_typeUNTHREADED SINGLE INLET
NSN2990-00-846-0732
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CONFERENCE BRIDGE,TELEPHONE TITLE COMPONENT PN FD78 MFR CONFERENCE BRIDGE,TELE
KEY FEATURES
OVERALL DIAMETER: 5.250 INCHES NOMINAL IN
OPERATING POSITION: HORIZONTAL
INLET OUTSIDE DIAMETER: 1.875 INCHES NOMINAL SINGLE INLET IN
INLET LOCATION: OFFSET FROM CENTER IN BOTTOM
SURFACE TREATMENT: ALUMINUM
INLET CONNECTION TYPE: UNTHREADED SINGLE INLET
COOLANT TYPE: AIR
OUTLET PROJECTION LENGTH: 1.875 INCHES NOMINAL FIRST OUTLET IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER5.250 INCHES NOMINAL IN
OPERATING POSITIONHORIZONTAL
INLET OUTSIDE DIAMETER1.875 INCHES NOMINAL SINGLE INLET IN
INLET LOCATIONOFFSET FROM CENTER IN BOTTOM
SURFACE TREATMENTALUMINUM
INLET CONNECTION TYPEUNTHREADED SINGLE INLET
COOLANT TYPEAIR
OUTLET PROJECTION LENGTH1.875 INCHES NOMINAL FIRST OUTLET IN
INLET PROJECTION LENGTH1.875 INCHES NOMINAL SINGLE INLET IN
INLET INSIDE DIAMETER1.750 INCHES NOMINAL SINGLE INLET IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
53BInterchangeable
interchangeable cross-reference
interchangeable
SF53BInterchangeable
interchangeable cross-reference
interchangeable
SFJAX53BInterchangeable
interchangeable cross-reference
interchangeable
107773PC478Interchangeable
interchangeable cross-reference
interchangeable
107673PC478Interchangeable
interchangeable cross-reference
interchangeable
90023PC478Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FD78?
FD78 is a CONFERENCE BRIDGE,TELEPHONE.
What parts can replace FD78?
There are 27 known substitutes for FD78: 53B, SF53B, SFJAX53B and 24 more. Substitute compatibility should be verified for your specific system.
Is FD78 still available?
FD78 is currently cancelled.
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