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Technical Data Sheet
PartsTable / COMPONENT / B-178
B-178 ✓ 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 RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, bore_shape: STRAIGHT, flange_width: 0.0420 INCHES NOMINAL IN, body_diameter: 2.9375 INCHES NOMINAL IN, bore_diameter: 0.1875 INCHES NOMINAL IN, load_direction: RADIAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5945-00-074-2161, 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
B-178
NSN: 5945-00-074-2161
FSC: 5945
CAGE: 74063 — TE CONNECTIVITY CORPORATION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
bore_shapeSTRAIGHT
flange_width0.0420 INCHES NOMINAL IN
body_diameter2.9375 INCHES NOMINAL IN
bore_diameter0.1875 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
inner_ring_width0.1960 INCHES NOMINAL IN
outer_ring_width0.1562 INCHES NOMINAL IN
style_designatorCYLINDRICAL W/ INTEGRAL OUTER CASING
features_providedANTIDRAIN BACK DEVICE AND BY-PASS VALVE
internal_clearance0.0002 INCHES MINIMUM RADIAL AND 0.0005 INCHES MAXIMUM RADIAL IN
NSN5945-00-074-2161
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RELAY,ELECTROMAGNETIC TITLE COMPONENT PN B-178 MFR RELAY,ELECTROMAGNETIC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
4118Interchangeable
interchangeable cross-reference
interchangeable
2627518Interchangeable
interchangeable cross-reference
interchangeable
B178Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-178?
B-178 is a RELAY,ELECTROMAGNETIC.
What parts can replace B-178?
There are 3 known substitutes for B-178: 4118, 2627518, B178. Substitute compatibility should be verified for your specific system.
What is the NSN for B-178?
B-178 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5945-00-074-2161. 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