Magnetics Intl · Electronic Components
4178
Brush, Electrical Contact
Part Number4178
ManufacturerMagnetics Intl
AvailabilityAvailable to order — request a quote
Specifications
NSN5977-00-379-4349 (NSN)
Federal Item NameBRUSH,ELECTRICAL CONTACT
Federal Supply Class5977 — Electrical Contact Brushes and Electrodes
Style DesignatorONE PIECE
Top StyleCONICAL HEAD
Length0.625 INCHES NOMINAL
Contact Face StyleCONCAVE
Head Minor Diameter0.097 INCHES NOMINAL
Radius0.719 INCHES NOMINAL
Head Major Diameter0.125 INCHES NOMINAL
Head Length0.125 INCHES NOMINAL
Width0.246 INCHES NOMINAL
Body StyleRECTANGULAR COMMUTATOR
MaterialGRAPHITE
Internal Circuit Configuration And7 POLE, MAINLINE, FUSED
Surface TreatmentSILVER CONTACT
Terminal Type And Quantity9 SCREW
Overall Width4.281 INCHES NOMINAL
Accommodated Fuse Length1.250 INCHES NOMINAL
Fuse Terminal Type AccommodatedFERRULE
Overall Length2.375 INCHES NOMINAL
Accommodated Ferrule Diameter0.250 INCHES NOMINAL
Fuse Accommodation Quantity7
Inclosure TypeFULLY INCLOSED
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is 4178 available?
We can source 4178 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is 4178 by Magnetics Intl obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 4178 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like 4178?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for 4178?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.